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121-403: Václav Havel Airport Prague ( Czech : Letiště Václava Havla Praha ) Czech pronunciation: [ˈlɛcɪʃcɛ ˈvaːt͡slava ˈɦavla ˈpraɦa] ( IATA : PRG , ICAO : LKPR ), formerly Prague Ruzyně International Airport ( Mezinárodní letiště Praha-Ruzyně , Czech pronunciation: [ˈmɛzɪnaːrodɲiː ˈlɛcɪʃcɛ ˈpraɦa ˈruzɪɲɛ] ), is an international airport of Prague , the capital of

242-588: A Pennsylvania Central Airlines Boeing 247 D flew from Washington, D.C., to Pittsburgh, Pennsylvania, and landed in a snowstorm using only the Instrument Landing System. The first fully automatic landing using ILS occurred in March 1964 at Bedford Airport in the UK. The instrument landing systems market revenue was US$ 1,215 million in 2019, and is expected to reach US$ 1,667 million in 2025, with

363-497: A head-up display (HUD) guidance that provides the pilot with an image viewed through the windshield with eyes focused at infinity, of necessary electronic guidance to land the airplane with no true outside visual references. In the United States, airports with CAT III approaches have listings for CAT IIIa and IIIb or just CAT III on the instrument approach plate (U.S. Terminal Procedures). CAT IIIb RVR minimums are limited by

484-809: A CAGR of 5.41% during 2020–2025 even with the negative effects of the COVID-19 pandemic . The top 10 manufacturers in the instrument landing systems market are: Other manufacturers include: The advent of the Global Positioning System (GPS) provides an alternative source of approach guidance for aircraft. In the US, the Wide Area Augmentation System (WAAS) has been available in many regions to provide precision guidance to Category I standards since 2007. The equivalent European Geostationary Navigation Overlay Service (EGNOS)

605-474: A CAT I ILS approach supported by a 1,400-to-3,000-foot-long (430 to 910 m) ALS, and 3 ⁄ 8 mile (600 m) visibility 1,800-foot (550 m) visual range is possible if the runway has high-intensity edge lights, touchdown zone and centerline lights, and an ALS that is at least 2,400 feet (730 m) long (see Table 3-3-1 "Minimum visibility values" in FAA Order 8260.3C). In effect, ALS extends

726-420: A CAT I localizer must shut down within 10 seconds of detecting a fault, but a CAT III localizer must shut down in less than 2 seconds. In contrast to other operations, CAT III weather minima do not provide sufficient visual references to allow a manual landing to be made. CAT IIIb minima depend on roll-out control and redundancy of the autopilot, because they give only enough time for the pilot to decide whether

847-416: A conventional voltmeter , with the 90 Hz output pulling the needle right and the other left. Along the centreline the two modulating tones of the sidebands will be cancelled out and both voltages will be zero, leaving the needle centered in the display. If the aircraft is far to the left, the 90 Hz signal will produce a strong DC voltage (predominates), and the 150 Hz signal is minimised, pulling

968-635: A distinction between phonemic /l/ and /ʎ/ which survives in Slovak. With the beginning of the national revival of the mid-18th century, Czech historians began to emphasize their people's accomplishments from the 15th through 17th centuries, rebelling against the Counter-Reformation (the Habsburg re-catholization efforts which had denigrated Czech and other non- Latin languages). Czech philologists studied sixteenth-century texts and advocated

1089-506: A dozen additional counties in Nebraska, Kansas, Texas, North Dakota and Minnesota . As of 2009, 70,500 Americans spoke Czech as their first language (49th place nationwide, after Turkish and before Swedish ). Standard Czech contains ten basic vowel phonemes , and three diphthongs. The vowels are /a/, /ɛ/, /ɪ/, /o/, and /u/ , and their long counterparts /aː/, /ɛː/, /iː/, /oː/ and /uː/ . The diphthongs are /ou̯/, /au̯/ and /ɛu̯/ ;

1210-468: A fail-operational system, along with a crew who are qualified and current, while CAT I does not. A HUD that allows the pilot to perform aircraft maneuvers rather than an automatic system is considered as fail-operational. A HUD allows the flight crew to fly the aircraft using the guidance cues from the ILS sensors such that if a safe landing is in doubt, the crew can respond in an appropriate and timely manner. HUD

1331-450: A ground-based instrument approach system that provides precision lateral and vertical guidance to an aircraft approaching and landing on a runway , using a combination of radio signals and, in many cases, high-intensity lighting arrays to enable a safe landing during instrument meteorological conditions (IMC) , such as low ceilings or reduced visibility due to fog, rain, or blowing snow. Previous blind landing radio aids typically took

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1452-449: A low-power omnidirectional augmentation signal to be broadcast from the airport, which is dramatically less expensive than the multiple, large and powerful transmitters required for a full ILS implementation. By 2015, the number of US airports supporting ILS-like LPV approaches exceeded the number of ILS installations, and this is expected to lead to the eventual removal of ILS at most airports. An instrument landing system operates as

1573-571: A more-restricted distinction between "hard" and "soft" consonants (see Phonology below). The term "Old Czech" is applied to the period predating the 16th century, with the earliest records of the high medieval period also classified as "early Old Czech", but the term "Medieval Czech" is also used. The function of the written language was initially performed by Old Slavonic written in Glagolitic , later by Latin written in Latin script . Around

1694-471: A particular phase shift and power level applied only to the SBO signal such that the resulting signal is retarded 90 degrees on the left side of the runway and advanced 90 degrees on the right. Additionally, the 150 Hz signal is inverted on one side of the pattern, another 180 degree shift. Due to the way the signals mix in space the SBO signals destructively interfere with and almost eliminate each other along

1815-589: A privatisation process involving the Airport Prague ( Správa Letiště Praha, s.p. ) state enterprise. This action was in accordance with the Czech Republic Government Memorandum Nr. 888, which had been passed on 9 July 2008. On 1 December 2008, Prague Airport took all rights and duties formerly held by Správa Letiště Praha, s.p., and Prague Airports took all business authorisations, certificates, employees, and licenses from

1936-436: A railway connection between the airport and Prague city centre is also in the planning stage. The track will be served by express trains with special fares, connecting the airport non-stop with the city centre, and local trains fully integrated into Prague integrated transit system. Prague Airport has two main passenger terminals, two general aviation terminals, as well as a cargo facility. Most flights depart Prague Airport from

2057-514: A realistic chance of returning as a major language. However, Josef Jungmann and other revivalists used Dobrovský's book to advocate for a Czech linguistic revival. Changes during this time included spelling reform (notably, í in place of the former j and j in place of g ), the use of t (rather than ti ) to end infinitive verbs and the non-capitalization of nouns (which had been a late borrowing from German). These changes differentiated Czech from Slovak. Modern scholars disagree about whether

2178-489: A slow rise from low to high, quickly dropping to low on the last word or phrase. In modern Czech syntax, adjectives precede nouns, with few exceptions. Relative clauses are introduced by relativizers such as the adjective který , analogous to the English relative pronouns "which", "that" and "who"/"whom". As with other adjectives, it agrees with its associated noun in gender, number and case. Relative clauses follow

2299-403: A sufficient signal to support a back course. In the United States, back course approaches are typically associated with Category I systems at smaller airports that do not have an ILS on both ends of the primary runway. Pilots flying a back course should disregard any glide slope indication. On some installations, marker beacons operating at a carrier frequency of 75 MHz are provided. When

2420-474: A verb; information about its subject is encoded in the verb. Enclitics (primarily auxiliary verbs and pronouns) appear in the second syntactic slot of a sentence, after the first stressed unit. The first slot can contain a subject or object, a main form of a verb, an adverb, or a conjunction (except for the light conjunctions a , "and", i , "and even" or ale , "but"). Czech syntax has a subject–verb–object sentence structure. In practice, however, word order

2541-424: A view outside the cockpit. A basic system, fully operative, was introduced in 1932 at Berlin- Tempelhof Central Airport (Germany) named LFF or " Lorenz beam " after its inventor, the C. Lorenz AG company. The Civil Aeronautics Board (CAB) of the United States authorized installation of the system in 1941 at six locations. The first landing of a scheduled U.S. passenger airliner using ILS was on January 26, 1938, when

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2662-753: Is a West Slavic language of the Czech–Slovak group , written in Latin script . Spoken by over 12 million people including second language speakers, it serves as the official language of the Czech Republic . Czech is closely related to Slovak , to the point of high mutual intelligibility , as well as to Polish to a lesser degree. Czech is a fusional language with a rich system of morphology and relatively flexible word order . Its vocabulary has been extensively influenced by Latin and German . The Czech–Slovak group developed within West Slavic in

2783-636: Is a member of the West Slavic sub-branch of the Slavic branch of the Indo-European language family. This branch includes Polish , Kashubian , Upper and Lower Sorbian and Slovak . Slovak is the most closely related language to Czech, followed by Polish and Silesian . The West Slavic languages are spoken in Central Europe. Czech is distinguished from other West Slavic languages by

2904-571: Is a recognized minority language in Slovakia, Slovak citizens who speak only Czech may communicate with the government in their language in the same way that Slovak speakers in the Czech Republic also do. Immigration of Czechs from Europe to the United States occurred primarily from 1848 to 1914. Czech is a Less Commonly Taught Language in U.S. schools, and is taught at Czech heritage centers. Large communities of Czech Americans live in

3025-422: Is also relevant to the declension patterns of nouns, which vary according to whether the final consonant of the noun stem is hard or soft. Voiced consonants with unvoiced counterparts are unvoiced at the end of a word before a pause, and in consonant clusters voicing assimilation occurs, which matches voicing to the following consonant. The unvoiced counterpart of /ɦ/ is /x/. The phoneme represented by

3146-423: Is also sent into a circuit that suppresses the original carrier, leaving only the four sideband signals. This signal, known as SBO for "sidebands only", is also sent to the antenna array. For lateral guidance, known as the localizer , the antenna is normally placed centrally at the far end of the runway and consists of multiple antennas in an array normally about the width of the runway. Each individual antenna has

3267-402: Is an antenna array normally located beyond the departure end of the runway and generally consists of several pairs of directional antennas. The localizer will allow the aircraft to turn and match the aircraft with the runway. After that, the pilots will activate approach phase (APP). The pilot controls the aircraft so that the glide slope indicator remains centered on the display to ensure

3388-404: Is at 108.10 and paired with glideslope at 334.70, whereas channel two is 108.15 and 334.55. There are gaps and jumps through both bands. Many illustrations of the ILS concept often show the system operating more similarly to beam systems with the 90 Hz signal on one side and the 150 on the other. These illustrations are inaccurate; both signals are radiated across the entire beam pattern, it

3509-500: Is becoming increasingly popular with "feeder" airlines and most manufacturers of regional jets are now offering HUDs as either standard or optional equipment. A HUD can provide capability to take off in low visibility. Some commercial aircraft are equipped with automatic landing systems that allow the aircraft to land without transitioning from instruments to visual conditions for a normal landing. Such autoland operations require specialized equipment, procedures and training, and involve

3630-463: Is complex, and requires a considerable amount of ground equipment, the resulting signal is both far more accurate than the older beam-based systems and is far more resistant to common forms of interference. For instance, static in the signal will affect both sub-signals equally, so it will have no effect on the result. Similarly, changes in overall signal strength as the aircraft approaches the runway, or changes due to fading , will have little effect on

3751-403: Is done in simulators with various degrees of fidelity. At a controlled airport, air traffic control will direct aircraft to the localizer course via assigned headings, making sure aircraft do not get too close to each other (maintain separation), but also avoiding delay as much as possible. Several aircraft can be on the ILS at the same time, several miles apart. An aircraft that has turned onto

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3872-432: Is flexible and used to distinguish topic and focus , with the topic or theme (known referents) preceding the focus or rheme (new information) in a sentence; Czech has therefore been described as a topic-prominent language . Although Czech has a periphrastic passive construction (like English), in colloquial style, word-order changes frequently replace the passive voice. For example, to change "Peter killed Paul" to "Paul

3993-411: Is indicated to the flight crew by means of a display dial (a carryover from when an analog meter movement indicated deviation from the course line via voltages sent from the ILS receiver). The output from the ILS receiver goes to the display system (head-down display and head-up display if installed) and may go to a Flight Control Computer . An aircraft landing procedure can be either coupled where

4114-407: Is noted on the instrument approach procedure and the aircraft must have at least one operating DME unit, or an IFR-approved system using a GNSS (an RNAV system meeting TSO-C129/ -C145/-C146), to begin the approach. Some installations include medium- or high-intensity approach light systems (abbreviated ALS ). Most often, these are at larger airports but many small general aviation airports in

4235-629: Is one of the EU's official languages and the 2012 Eurobarometer survey found that Czech was the foreign language most often used in Slovakia. Economist Jonathan van Parys collected data on language knowledge in Europe for the 2012 European Day of Languages . The five countries with the greatest use of Czech were the Czech Republic (98.77 percent), Slovakia (24.86 percent), Portugal (1.93 percent), Poland (0.98 percent) and Germany (0.47 percent). Czech speakers in Slovakia primarily live in cities. Since it

4356-479: Is permanently closed for take-offs and landings and is used for taxiing and parking only. The most used runway is 24 due to the prevailing western winds. Runway 30 is also used often. Runway 06 is used rarely, while runway 12 is used only exceptionally. Czech Airlines has its head office, the APC Building, on the grounds of Prague Airport. On 30 December 2009 CSA announced that it would sell its head office to

4477-575: Is realized as its voiceless allophone [r̝̊], a sound somewhere between Czech r and š . The consonants /r/, /l/, and /m/ can be syllabic , acting as syllable nuclei in place of a vowel. Strč prst skrz krk ("Stick [your] finger through [your] throat") is a well-known Czech tongue twister using syllabic consonants but no vowels. Each word has primary stress on its first syllable , except for enclitics (minor, monosyllabic, unstressed syllables). In all words of more than two syllables, every odd-numbered syllable receives secondary stress. Stress

4598-447: Is supposed to be completed by the year 2033. As the capacity of the airport has been reaching its limit for the last couple of years (as of 2005), further development of the airport is being considered. Besides regular repairs of the existing runways, Prague Airport ( Czech : Letiště Praha s.p. ) began the preparations for building a new runway, parallel to the 06/24 runway. The construction with estimated costs of CZK 5–7 billion

4719-424: Is their relative difference in the depth of modulation (DDM) that changes dependent upon the position of the approaching aircraft. An instrument approach procedure chart (or ' approach plate ') is published for each ILS approach to provide the information needed to fly an ILS approach during instrument flight rules (IFR) operations. A chart includes the radio frequencies used by the ILS components or navaids and

4840-491: Is too low to travel far from an antenna, but the other three signals are all radio frequency and can be effectively transmitted. ILS starts by mixing two modulating signals to the carrier, one at 90 Hz and another at 150. This creates a signal with five radio frequencies in total, the carrier and four sidebands. This combined signal, known as the CSB for "carrier and sidebands", is sent out evenly from an antenna array. The CSB

4961-499: Is unrelated to vowel length; both long and short vowels can be stressed or unstressed. Vowels are never reduced in tone (e.g. to schwa sounds) when unstressed. When a noun is preceded by a monosyllabic preposition, the stress usually moves to the preposition, e.g. do Prahy "to Prague". Czech grammar, like that of other Slavic languages, is fusional ; its nouns, verbs, and adjectives are inflected by phonological processes to modify their meanings and grammatical functions, and

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5082-577: The Czech Republic . The airport was founded in 1937 when it replaced the Kbely Airport (founded in 1918) as the city's principal airport. It was reconstructed and extended in 1956, 1968, 1997, and 2006. In 2012, it was renamed after the last president of Czechoslovakia and the first president of the Czech Republic, Václav Havel . It is located at the edge of the Prague- Ruzyně area, next to Kněževes village, 12 km (7 mi) west of

5203-733: The Kralice Bible between 1579 and 1593 (the first complete Czech translation of the Bible from the original languages) became very important for standardization of the Czech language in the following centuries as it was used as a model for the standard language. In 1615, the Bohemian diet tried to declare Czech to be the only official language of the kingdom. After the Bohemian Revolt (of predominantly Protestant aristocracy) which

5324-622: The Leskovec-Dresden Bible , also dates to this period. Old Czech texts, including poetry and cookbooks, were also produced outside universities. Literary activity becomes widespread in the early 15th century in the context of the Bohemian Reformation . Jan Hus contributed significantly to the standardization of Czech orthography , advocated for widespread literacy among Czech commoners (particularly in religion) and made early efforts to model written Czech after

5445-420: The amplitude modulation index , a measure of how strongly the amplitude modulation is applied to the carrier frequency . In the earlier beam systems, the signal was turned on and off entirely, corresponding to a modulation index of 100%. The determination of angle within the beam is based on the comparison of the audible strength of the two signals. sa In ILS, a more complex system of signals and antennas varies

5566-434: The glideslope (329.15 to 335 MHz frequency) for vertical guidance. The relationship between the aircraft's position and these signals is displayed on an aircraft instrument , often additional pointers in the attitude indicator . The pilot attempts to manoeuvre the aircraft to keep the indicators centered while they approach the runway to the decision height . Optional marker beacon(s) provide distance information as

5687-742: The high medieval period, and the standardization of Czech and Slovak within the Czech–Slovak dialect continuum emerged in the early modern period. In the later 18th to mid-19th century, the modern written standard became codified in the context of the Czech National Revival . The most widely spoken non-standard variety , known as Common Czech, is based on the vernacular of Prague , but is now spoken as an interdialect throughout most of Bohemia . The Moravian dialects spoken in Moravia and Czech Silesia are considerably more varied than

5808-452: The radar -based ground-controlled approach (GCA) and the more recent microwave landing system (MLS), but few of these systems have been deployed. ILS remains a widespread standard to this day. The introduction of precision approaches using global navigation satellite systems (GNSSs) instead of requiring expensive airport infrastructure is leading to the replacement of ILS. Providing the required accuracy with GNSS normally requires only

5929-406: The voiced velar fricative consonant (/ɣ/) and consistent stress on the first syllable. The Bohemian (Czech) language is first recorded in writing in glosses and short notes during the 12th to 13th centuries. Literary works written in Czech appear in the late 13th and early 14th century and administrative documents first appear towards the late 14th century. The first complete Bible translation ,

6050-708: The 1920s and 1940s, notably the Lorenz beam which saw relatively wide use in Europe prior to World War II . The US-developed SCS-51 system was more accurate while also adding vertical guidance. Many sets were installed at airbases in the United Kingdom during World War II , which led to it being selected as the international standard after the formation of the International Civil Aviation Organization (ICAO) in 1947. Several competing landing systems have been developed, including

6171-528: The 7th century, the Slavic expansion reached Central Europe, settling on the eastern fringes of the Frankish Empire . The West Slavic polity of Great Moravia formed by the 9th century. The Christianization of Bohemia took place during the 9th and 10th centuries. The diversification of the Czech-Slovak group within West Slavic began around that time, marked among other things by its use of

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6292-474: The ALS counts as runway end environment. In the U.S., an ILS without approach lights may have CAT I ILS visibility minimums as low as 3 ⁄ 4 mile (1.2 km) (runway visual range of 4,000 feet (1,200 m)) if the required obstacle clearance surfaces are clear of obstructions. Visibility minimums of 1 ⁄ 2 mile (0.80 km) (runway visual range of 2,400 feet (730 m)) are possible with

6413-416: The Czech Republic. A rendition of the airport with the proposed Václav Havel name in the form of his signature followed by his typical heart symbol suffix was included in the blog's article in support of renaming of the airport. This name change took place on 5 October 2012 on what would have been Havel's 76th birthday. The PRG name of the airport for IATA and ICAO will remain the same. The main runway 06/24

6534-452: The ILS glide slope to the pilot, and does not require an installation outside the airport boundary. When used in conjunction with an ILS, the DME is often sited midway between the reciprocal runway thresholds with the internal delay modified so that one unit can provide distance information to either runway threshold. For approaches where a DME is specified in lieu of marker beacons, DME required

6655-515: The North Terminals (Terminals 1 and 2). The South Terminals (Terminals 3 and 4) handle a few irregular flights, as well as VIP flights, special flights and small aircraft. There are also two freight terminals, Cargo Terminal 1 is operated by Menzies Aviation Czech while Cargo Terminal 2 is operated by Skyport. The airport contains two runways in service: 06/24 (till April 1993 07/25) and 12/30 (till May 2012 13/31). Former runway 04/22

6776-477: The Prague Public Transit Co., stop at both terminals 1 and 2 frequently. A Czech Railways public bus service, AE – AirportExpress, connects Terminal 1 with Praha hlavní nádraží . From the bus station in front of Terminal 1 there are also regular buses to Kladno , intercity buses of Regiojet run every 30–60 minutes to Karlovy Vary and Cheb . There are plans to build a rail connection to

6897-548: The Ruzyně fields provide opportunities for further expansion of the airport according to the increasing capacity demand. The airport serves as a hub of the trans-European airport network. Political and economic changes have significantly influenced Prague–Ruzyně Airport's seventy-year history. Some new air transportation companies and institutions have been founded and some have ceased operation since 1937. Ten entities have been responsible for airport administration over time, including

7018-501: The U.S. have approach lights to support their ILS installations and obtain low-visibility minimums. The ALS assists the pilot in transitioning from instrument to visual flight, and to align the aircraft visually with the runway centerline. Pilot observation of the approach lighting system at the Decision Altitude allows the pilot to continue descending towards the runway, even if the runway or runway lights cannot be seen, since

7139-458: The aircraft is following the glide path of approximately 3° above horizontal (ground level) to remain above obstructions and reach the runway at the proper touchdown point (i.e. it provides vertical guidance). Due to the complexity of ILS localizer and glide slope systems, there are some limitations. Localizer systems are sensitive to obstructions in the signal broadcast area, such as large buildings or hangars. Glide slope systems are also limited by

7260-607: The aircraft will land in the touchdown zone (basically CAT IIIa) and to ensure safety during rollout (basically CAT IIIb). Therefore, an automatic landing system is mandatory to perform Category III operations. Its reliability must be sufficient to control the aircraft to touchdown in CAT IIIa operations and through rollout to a safe taxi speed in CAT IIIb (and CAT IIIc when authorized). However, special approval has been granted to some operators for hand-flown CAT III approaches using

7381-554: The aircraft, airport, and the crew. Autoland is the only way some major airports such as Charles de Gaulle Airport remain operational every day of the year. Some modern aircraft are equipped with enhanced flight vision systems based on infrared sensors, that provide a day-like visual environment and allow operations in conditions and at airports that would otherwise not be suitable for a landing. Commercial aircraft also frequently use such equipment for takeoffs when takeoff minima are not met. For both automatic and HUD landing systems,

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7502-588: The airport for CZK 607 million. Smartwings have their head office on the airport property. In addition the Civil Aviation Authority also has its head office on the airport property. The company operating the airport is Prague Airport ( Letiště Praha, a. s. ), a joint-stock company that has one shareholder, the Ministry of Finance . The company was founded in February 2008, as part of

7623-498: The airport. Preliminary work commenced in 2018, with procurement proceedings launched the following year. Main construction is likely to start around 2023, and completion is (as of summer 2022) expected to be 2029. According to a 2021 media report, the airport is to be served via a branch off the Prague-Kladno line, including an underground station to serve the airport. The project also includes double tracking and electrifying

7744-445: The approach path of runway 12/30 goes above high-density population areas (such as Prague 6 and Kladno ). Therefore, the second and the third stage of the runway reconstruction had to be merged so the works could be finished in 2013. An expansion of the existing terminals is scheduled to start construction sometime during the year 2027 or 2028. A new pier is supposed to be built to expand the existing Terminal 2 and it will be south of

7865-441: The approach proceeds, including the middle marker (MM), placed close to the position of the (CAT 1) decision height. Markers are largely being phased out and replaced by distance measuring equipment (DME). The ILS usually includes high-intensity lighting at the end of the runways to help the pilot locate the runway and transition from the approach to a visual landing. A number of radio-based landing systems were developed between

7986-410: The autopilot or Flight Control Computer directly flies the aircraft and the flight crew monitor the operation, or uncoupled where the flight crew flies the aircraft manually to keep the localizer and glideslope indicators centered. Tests of the ILS began in 1929 in the United States, with Jimmy Doolittle becoming the first pilot to take off, fly and land an airplane using instruments alone, without

8107-429: The beam that contains the angle information, not the strength of the beam, the signal does not have to be tightly focussed in space. In the older beam systems, the accuracy of the equisignal area was a function of the pattern of the two directional signals, which demanded that they be relatively narrow. The ILS pattern can be much wider. ILS installations are normally required to be usable within 10 degrees on either side of

8228-453: The carrier. Either of these actions will activate an indication ('failure flag') on the instruments of an aircraft using the ILS. Modern localizer antennas are highly directional . However, usage of older, less directional antennas allows a runway to have a non-precision approach called a localizer back course . This lets aircraft land using the signal transmitted from the back of the localizer array. Highly directional antennas do not provide

8349-417: The center. To use the system an aircraft only needed a conventional radio receiver. As they approached the airport they would tune in the signal and listen to it in their headphones. They would hear dots and dashes (Morse code "A" or "N"), if they were to the side of the runway, or if they were properly aligned, the two mixed together to produce a steady tone, the equisignal . The accuracy of this measurement

8470-407: The centerline, leaving the CSB signal predominating. At any other location, on either side of the centerline, the SBO and CSB signals combine in different ways so that one modulating signal predominates. A receiver in front of the array will receive both of these signals mixed together. Using simple electronic filters, the original carrier and two sidebands can be separated and demodulated to extract

8591-421: The centre of Prague and 12 km (7 mi) southeast of the city of Kladno . In 2018, it served around 17 million passengers. It served as a hub for Czech Airlines until it ceased operations in late 2024 and it serves as a hub for Smartwings , and as an operating base for Ryanair and Eurowings . Prague–Ruzyně Airport began operations on 5 April 1937, but Czechoslovak civil aviation history started at

8712-419: The complexity of the antenna system. ILS critical areas and ILS sensitive areas are established to avoid hazardous reflections that would affect the radiated signal. The location of these critical areas can prevent aircraft from using certain taxiways leading to delays in takeoffs, increased hold times, and increased separation between aircraft . In addition to the previously mentioned navigational signals,

8833-434: The conservative revivalists were motivated by nationalism or considered contemporary spoken Czech unsuitable for formal, widespread use. Adherence to historical patterns was later relaxed and standard Czech adopted a number of features from Common Czech (a widespread informal interdialectal variety), such as leaving some proper nouns undeclined. This has resulted in a relatively high level of homogeneity among all varieties of

8954-480: The correct function of the glide slope. In modern ILS installations, a DME is installed, co-located with the ILS, to augment or replace marker beacons. A DME continuously displays the aircraft's distance to the runway. Distance measuring equipment (DME) provides pilots with a slant range measurement of distance to the runway. DMEs are augmenting or replacing markers in many installations. The DME provides more accurate and continuous monitoring of correct progress on

9075-472: The descent to a landing; otherwise, the pilot must execute a missed approach procedure, then try the same approach again, try a different approach, or divert to another airport. Usually, the decision on whether or not the pilot continues with the approach relies on whether the runway is visible or not, or if the runway is clear or not. Smaller aircraft generally are equipped to fly only a CAT I ILS. On larger aircraft, these approaches typically are controlled by

9196-427: The dialects of Bohemia. Czech has a moderately-sized phoneme inventory, comprising ten monophthongs , three diphthongs and 25 consonants (divided into "hard", "neutral" and "soft" categories). Words may contain complicated consonant clusters or lack vowels altogether. Czech has a raised alveolar trill , which is known to occur as a phoneme in only a few other languages, represented by the grapheme ř . Czech

9317-405: The easily separable affixes characteristic of agglutinative languages are limited. Czech inflects for case, gender and number in nouns and tense, aspect, mood , person and subject number and gender in verbs. Parts of speech include adjectives, adverbs , numbers, interrogative words , prepositions , conjunctions and interjections . Adverbs are primarily formed from adjectives by taking

9438-467: The equipment requires special approval for its design and also for each individual installation. The design takes into consideration additional safety requirements for operating an aircraft close to the ground and the ability of the flight crew to react to a system anomaly. The equipment also has additional maintenance requirements to ensure that it is capable of supporting reduced visibility operations. Nearly all of this pilot training and qualification work

9559-434: The existing single-track railway . The plan also includes upgrades to Prague-Masarykovo station {{|ASN accident|id=327996|title=HA-LCF|accessdate= April 24, 2024}} Czech language Czech ( / tʃ ɛ k / CHEK ; endonym : čeština [ˈtʃɛʃcɪna] ), historically also known as Bohemian ( / b oʊ ˈ h iː m i ə n , b ə -/ boh- HEE -mee-ən, bə- ; Latin : lingua Bohemica ),

9680-477: The final ý or í of the base form and replacing it with e , ě , y , or o . Negative statements are formed by adding the affix ne- to the main verb of a clause, with one exception: je (he, she or it is) becomes není . Because Czech uses grammatical case to convey word function in a sentence (instead of relying on word order , as English does), its word order is flexible. As a pro-drop language , in Czech an intransitive sentence can consist of only

9801-426: The flight control system with the flight crew providing supervision. CAT I relies only on altimeter indications for decision height, whereas CAT II and CAT III approaches use radio altimeter (RA) to determine decision height. An ILS must shut down upon internal detection of a fault condition. Higher categories require shorter response times; therefore, ILS equipment is required to shut down more quickly. For example,

9922-433: The form of beam systems of various types. These normally consisted of a radio transmitter that was connected to a motorized switch to produce a pattern of Morse code dots and dashes. The switch also controlled which of two directional antennae the signal was sent to. The resulting signal sent into the air consists of dots sent to one side of the runway and dashes to the other. The beams were wide enough so they overlapped in

10043-485: The former company. The head office of Prague Airport is in Prague 6 . The former state-owned enterprise had its head office on the airport property. As of 2024, Prague Airport offers flights to more than 170 destinations, with 70 carriers operating the flights. The following airlines operate regular scheduled and charter flights at Prague Airport: The top 15 destinations by passengers handled in 2019 were: Buses of DPP ,

10164-417: The ground station and transmitters, with the advantage that the signals can be accurately decoded in the aircraft using simple electronics and displayed directly on analog instruments. The instruments can be placed in front of the pilot, eliminating the need for a radio operator to continually monitor the signals and relay the results to the pilot over the intercom . Key to its operation is a concept known as

10285-405: The inbound heading and is within two and a half degrees of the localizer course (half scale deflection or less shown by the course deviation indicator) is said to be established on the approach. Typically, an aircraft is established by at least 2 nautical miles (3.7 km) prior to the final approach fix (glideslope intercept at the specified altitude). Aircraft deviation from the optimal path

10406-413: The landings. FAA Order 8400.13D limits CAT III to 300 ft RVR or better. Order 8400.13D (2009) allows special authorization CAT II approaches to runways without ALSF-2 approach lights and/or touchdown zone/centerline lights, which has expanded the number of potential CAT II runways. In each case, a suitably equipped aircraft and appropriately qualified crew are required. For example, CAT IIIb requires

10527-494: The language. Czech is spoken by about 10 million residents of the Czech Republic . A Eurobarometer survey conducted from January to March 2012 found that the first language of 98 percent of Czech citizens was Czech, the third-highest proportion of a population in the European Union (behind Greece and Hungary ). As the official language of the Czech Republic (a member of the European Union since 2004), Czech

10648-844: The last two are found only in loanwords such as auto "car" and euro "euro". In Czech orthography, the vowels are spelled as follows: The letter ⟨ ě ⟩ indicates that the previous consonant is palatalized (e.g. něco /ɲɛt͡so/ ). After a labial it represents /jɛ/ (e.g. běs /bjɛs/ ); but ⟨mě⟩ is pronounced /mɲɛ/, cf. měkký ( /mɲɛkiː/ ). The consonant phonemes of Czech and their equivalent letters in Czech orthography are as follows: Czech consonants are categorized as "hard", "neutral", or "soft": Hard consonants may not be followed by i or í in writing, or soft ones by y or ý (except in loanwords such as kilogram ). Neutral consonants may take either character. Hard consonants are sometimes known as "strong", and soft ones as "weak". This distinction

10769-504: The letter ř (capital Ř ) is very rare among languages and often claimed to be unique to Czech, though it also occurs in some dialects of Kashubian , and formerly occurred in Polish. It represents the raised alveolar non-sonorant trill ( IPA : [r̝] ), a sound somewhere between Czech r and ž (example: "řeka" (river) ), and is present in Dvořák . In unvoiced environments, /r̝/

10890-425: The lights on the high intensity, five times to medium intensity or three times for low intensity. Once established on an approach, the pilot follows the ILS approach path indicated by the localizer and descends along the glide path to the decision height. This is the height at which the pilot must have adequate visual reference to the landing environment (e.g. approach or runway lighting) to decide whether to continue

11011-408: The localizer for identification. It is essential that any failure of the ILS to provide safe guidance be detected immediately by the pilot. To achieve this, monitors continually assess the vital characteristics of the transmissions. If any significant deviation beyond strict limits is detected, either the ILS is automatically switched off or the navigation and identification components are removed from

11132-469: The localizer provides for ILS facility identification by periodically transmitting a 1,020 Hz Morse code identification signal. For example, the ILS for runway 4R at John F. Kennedy International Airport transmits IJFK to identify itself, while runway 4L is known as IHIQ. This lets users know the facility is operating normally and that they are tuned to the correct ILS. The glide slope station transmits no identification signal, so ILS equipment relies on

11253-581: The mentioned terminal and north of the new runway ( see "New runway" ). It will accommodate both non-Schengen ( departure and arrival ) and Schengen flights ( arrival only ). It will contain 8 jetway gates and 10 non-Schengen bus gates. An extension of the check-in hall at Terminal 1 is also going to be made. Modifications will be made to the existing piers (including pier A and B). Terminal 1 will be used only for Schengen flights and Terminal 2 will be used for both Schengen and non-Schengen flights. In addition, one Schengen bus gate will be added to pier A. This project

11374-778: The military airport in Prague– Kbely in 1919. The Prague Aviation Museum is now found at Kbely Airport. Due to the insufficient capacity of Kbely Airport by the mid-1930s, the government decided to develop a new state civil airport in Ruzyně. Among the major awards Prague Ruzyně Airport has received is the Diploma and Gold Medal granted in 1937 at the occasion of the International Art and Technical Exhibition in Paris ( Exposition Internationale des Arts et Techniques dans la Vie Moderne also known as Paris 1937 World's Fair ) for

11495-499: The modulation of two signals across the entire width of the beam pattern. The system relies on the use of sidebands , secondary frequencies that are created when two different signals are mixed. For instance, if one takes a radio frequency signal at 10 MHz and mixes that with an audible tone at 2500 Hz, four signals will be produced, at the original signals' frequencies of 2500 and 10000000 hertz, and sidebands 9997500 and 10002500 hertz. The original 2500 Hz signal's frequency

11616-414: The needle all the way to the right. This means the voltmeter directly displays both the direction and magnitude of the turn needed to bring the aircraft back to the runway centreline. As the measurement compares different parts of a single signal entirely in electronics, it provides angular resolution of less than a degree, and allows the construction of a precision approach . Although the encoding scheme

11737-523: The new construction and development. The airport stood in for Miami International Airport in the 2006 James Bond film Casino Royale . An online petition organised by one of the best-known Slovak film directors, Fero Fenič, calling on the government and the Parliament to rename Prague Ruzyně Airport to Václav Havel International Airport attracted – in just one week after 20 December 2011—the support of over 65,000 signatories both within and outside

11858-411: The noun they modify. The following is a glossed example: Chc-i want- 1SG navštív-it visit- INF universit-u, university- SG . ACC , na on kter-ou which- SG . F . ACC chod-í attend- 3SG Instrument landing system ILS uses two directional radio signals , the localizer (108 to 112 MHz frequency), which provides horizontal guidance, and

11979-425: The original amplitude-modulated 90 and 150 Hz signals. These are then averaged to produce two direct current (DC) signals. Each of these signals represents not the strength of the original signal, but the strength of the modulation relative to the carrier, which varies across the beam pattern. This has the great advantage that the measurement of angle is independent of range. The two DC signals are then sent to

12100-450: The prescribed minimum visibility requirements. An aircraft approaching a runway is guided by the ILS receivers in the aircraft by performing modulation depth comparisons. Many aircraft can route signals into the autopilot to fly the approach automatically. An ILS consists of two independent sub-systems. The localizer provides lateral guidance; the glide slope provides vertical guidance. A localizer (LOC, or LLZ until ICAO standardisation )

12221-410: The present main runway, the 24L runway will be equipped with a category III ILS , allowing landing and taking off under bad weather conditions. Prague Airport states that besides increasing the airport capacity, the new runway system will greatly reduce the noise level in some densely inhabited areas of Prague. This should be achieved by reorganising the air traffic space around the airport and shifting

12342-442: The radio course beams were used only for lateral guidance, and the system was not enough on its own to perform landings in heavy rain or fog. Nevertheless, the final decision to land was made at only 300 metres (980 ft) from the airport. The ILS, developed just prior to the start of World War II , used a more complex system of signals and an antenna array to achieve higher accuracy. This requires significantly more complexity in

12463-416: The resulting measurement because they would normally affect both channels equally. The system is subject to multipath distortion effects due to the use of multiple frequencies, but because those effects are dependent on the terrain, they are generally fixed in location and can be accounted for through adjustments in the antenna or phase shifters. Additionally, because it is the encoding of the signal within

12584-582: The return of the language to high culture . This period is known as the Czech National Revival (or Renaissance). During the national revival, in 1809 linguist and historian Josef Dobrovský released a German-language grammar of Old Czech entitled Ausführliches Lehrgebäude der böhmischen Sprache ('Comprehensive Doctrine of the Bohemian Language'). Dobrovský had intended his book to be descriptive , and did not think Czech had

12705-412: The runway centerline at 25 nautical miles (46 km; 29 mi), and 35 degrees on either side at 17 nautical miles (31 km; 20 mi). This allows for a wide variety of approach paths. The glideslope works in the same general fashion as the localizer and uses the same encoding, but is normally transmitted to produce a centerline at an angle of 3 degrees above horizontal from an antenna beside

12826-408: The runway environment out towards the landing aircraft and allows low-visibility operations. CAT II and III ILS approaches generally require complex high-intensity approach light systems, while medium-intensity systems are usually paired with CAT I ILS approaches. At some non-towered airports , the pilot controls the lighting system ; for example, the pilot can key the microphone seven times to turn on

12947-454: The runway instead of the end. The only difference between the signals is that the localizer is transmitted using lower carrier frequencies, using 40 selected channels between 108.10 MHz and 111.95 MHz, whereas the glideslope has a corresponding set of 40 channels between 328.6 and 335.4 MHz. The higher frequencies generally result in the glideslope radiating antennas being smaller. The channel pairs are not linear; localizer channel 1

13068-587: The runway/taxiway lighting and support facilities, and are consistent with the airport surface movement guidance control system (SMGCS) plan. Operations below 600 ft RVR require taxiway centerline lights and taxiway red stop bar lights. If the CAT IIIb RVR minimums on a runway end are 600 feet (180 m), which is a common figure in the U.S., ILS approaches to that runway end with RVR below 600 feet (180 m) qualify as CAT IIIc and require special taxi procedures, lighting, and approval conditions to permit

13189-441: The spoken language. There was no standardization distinguishing between Czech and Slovak prior to the 15th century. In the 16th century, the division between Czech and Slovak becomes apparent, marking the confessional division between Lutheran Protestants in Slovakia using Czech orthography and Catholics, especially Slovak Jesuits, beginning to use a separate Slovak orthography based on Western Slovak dialects. The publication of

13310-465: The states of Texas , Nebraska and Wisconsin . In the 2000 United States Census , Czech was reported as the most common language spoken at home (besides English ) in Valley , Butler and Saunders Counties , Nebraska and Republic County, Kansas . With the exception of Spanish (the non-English language most commonly spoken at home nationwide), Czech was the most common home language in more than

13431-415: The technical conception of the central airport, primarily the architecture of the check-in building (nowadays known as Terminal 4) designed by architect Adolf Benš. In one of the most dramatic moments in its history, the airport was seized by Soviet paratroopers on the night of 20–21 August 1968, who then facilitated the landing of Soviet troops and transports for the invasion of Czechoslovakia . Moreover,

13552-415: The terrain in front of the glide slope antennas. If terrain is sloping or uneven, reflections can create an uneven glidepath, causing unwanted needle deflections. Additionally, since the ILS signals are pointed in one direction by the positioning of the arrays, glide slope supports only straight-line approaches with a constant angle of descent. Installation of an ILS can be costly because of siting criteria and

13673-438: The traffic corridors after putting the two parallel runways into service. The vision of heavy traffic raised many protests from the suburban communities directly surrounding the airport. On 6 November 2004, local referendums were held in two Prague suburbs – Nebušice and Přední Kopanina – giving official support to the local authorities for active opposition against the construction of the parallel runway. The construction of

13794-404: The transmission from a marker beacon is received it activates an indicator on the pilot's instrument panel and the tone of the beacon is audible to the pilot. The distance from the runway at which this indication should be received is published in the documentation for that approach, together with the height at which the aircraft should be if correctly established on the ILS. This provides a check on

13915-424: The upper classes. Modern standard Czech originates in standardization efforts of the 18th century. By then the language had developed a literary tradition, and since then it has changed little; journals from that period contain no substantial differences from modern standard Czech, and contemporary Czechs can understand them with little difficulty. At some point before the 18th century, the Czech language abandoned

14036-413: Was certified for use in safety of life applications in March 2011. As such, the number of Cat I ILS installations may be reduced, however there are no plans in the United States to phase out any Cat II or Cat III systems. Local Area Augmentation System (LAAS) is under development to provide for Category III minimums or lower. The FAA Ground-Based Augmentation System (GBAS) office is currently working with

14157-686: Was defeated by the Habsburgs in 1620, the Protestant intellectuals had to leave the country. This emigration together with other consequences of the Thirty Years' War had a negative impact on the further use of the Czech language. In 1627, Czech and German became official languages of the Kingdom of Bohemia and in the 18th century German became dominant in Bohemia and Moravia, especially among

14278-400: Was highly dependent on the skill of the operator, who listened to the signal on earphones in a noisy aircraft, often while communicating with the tower. Accuracy of the system was normally on the order of 3 degrees in azimuth. While this was useful for bringing the aircraft onto the direction of the runway, it was not accurate enough to safely bring the aircraft to visual range in bad weather;

14399-529: Was killed by Peter" the order of subject and object is inverted: Petr zabil Pavla ("Peter killed Paul") becomes "Paul, Peter killed" ( Pavla zabil Petr ). Pavla is in the accusative case , the grammatical object of the verb. A word at the end of a clause is typically emphasized, unless an upward intonation indicates that the sentence is a question: In parts of Bohemia (including Prague ), questions such as Jí pes bagetu? without an interrogative word (such as co , "what" or kdo , "who") are intoned in

14520-493: Was reconstructed from 2012 to 2013 due to poor technical conditions. During reconstruction, runway 12/30 was the only usable runway as runway 04/22 is closed permanently. The runway reconstruction was originally planned for three stages. The first stage in 2012, the second stage in 2013 and the last stage in 2014. Runway 12/30 (which would be used during the reconstruction of the main runway) is not equipped for low visibility landings as it offers only ILS CAT I landings. In addition,

14641-481: Was scheduled to begin in 2007, and the new runway marked 06R/24L was to be put into service in 2010. Because of many legal problems and the protests of people who live close to the airport premises, as well as a result of the COVID-19 pandemic, construction is likely to start no sooner than in the 2030s. It is planned to be over 3,500 m (11,483 ft) long. Located about 1,500 m (4,921 ft) southeast of

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