Misplaced Pages

#100899

62-536: The production plant was established by decision of the War Industry Council on 9 September 1920, under the name of "State Aircraft Plant 12" (GAZ-12). It consisted of small uncoordinated workshops and until the war was located on Garmatna Street. The plant performed overhaul of foreign aircraft models used by the military. It had no aerodrome of its own, and aircraft were tested at Post-Volynsky aerodrome ( Kyiv International Airport (Zhuliany) ). In 1922

124-404: A combustion chamber , and accelerate the exhaust rearwards to provide thrust. Different jet engine configurations include the turbojet and turbofan , sometimes with the addition of an afterburner . Those with no rotating turbomachinery include the pulsejet and ramjet . These mechanically simple engines produce no thrust when stationary, so the aircraft must be launched to flying speed using

186-433: A lifting gas such as helium , hydrogen or hot air , which is less dense than the surrounding air. When the weight of the lifting gas is added to the weight of the aircraft itself, it is same or less than the mass of the air that the craft displaces. Small hot-air balloons, called sky lanterns , were first invented in ancient China prior to the 3rd century BC and used primarily in cultural celebrations, and were only

248-560: A catapult, like the V-1 flying bomb , or a rocket, for example. Other engine types include the motorjet and the dual-cycle Pratt & Whitney J58 . Compared to engines using propellers, jet engines can provide much higher thrust, higher speeds and, above about 40,000 ft (12,000 m), greater efficiency. They are also much more fuel-efficient than rockets . As a consequence nearly all large, high-speed or high-altitude aircraft use jet engines. Some rotorcraft, such as helicopters , have

310-638: A greater wingspan (94m/260 ft) than any current aircraft and a tail height equal to the tallest (Airbus A380-800 at 24.1m/78 ft) — flew only one short hop in the late 1940s and never flew out of ground effect . The largest civilian airplanes, apart from the above-noted An-225 and An-124, are the Airbus Beluga cargo transport derivative of the Airbus A300 jet airliner, the Boeing Dreamlifter cargo transport derivative of

372-674: A marginal case. The forerunner of the fixed-wing aircraft is the kite . Whereas a fixed-wing aircraft relies on its forward speed to create airflow over the wings, a kite is tethered to the ground and relies on the wind blowing over its wings to provide lift. Kites were the first kind of aircraft to fly and were invented in China around 500 BC. Much aerodynamic research was done with kites before test aircraft, wind tunnels , and computer modelling programs became available. The first heavier-than-air craft capable of controlled free-flight were gliders . A glider designed by George Cayley carried out

434-794: A maximum loaded weight of 550–700 t (1,210,000–1,540,000 lb), it was also the heaviest aircraft built to date. It could cruise at 500 mph (800 km/h; 430 kn). The aircraft was destroyed during the Russo-Ukrainian War . The largest military airplanes are the Ukrainian Antonov An-124 Ruslan (world's second-largest airplane, also used as a civilian transport), and American Lockheed C-5 Galaxy transport, weighing, loaded, over 380 t (840,000 lb). The 8-engine, piston/propeller Hughes H-4 Hercules "Spruce Goose" — an American World War II wooden flying boat transport with

496-569: A payload of up to 22,050 lb (10,000 kg). The largest aircraft by weight and largest regular fixed-wing aircraft ever built, as of 2016 , was the Antonov An-225 Mriya . That Soviet-built ( Ukrainian SSR ) six-engine transport of the 1980s was 84 m (276 ft) long, with an 88 m (289 ft) wingspan. It holds the world payload record, after transporting 428,834 lb (194,516 kg) of goods, and has flown 100 t (220,000 lb) loads commercially. With

558-588: A powered "tug" aircraft. For a glider to maintain its forward air speed and lift, it must descend in relation to the air (but not necessarily in relation to the ground). Many gliders can "soar", i.e. , gain height from updrafts such as thermal currents. The first practical, controllable example was designed and built by the British scientist and pioneer George Cayley , whom many recognise as the first aeronautical engineer. Common examples of gliders are sailplanes , hang gliders and paragliders . Balloons drift with

620-491: A powered rotary wing or rotor , where the rotor disc can be angled slightly forward so that a proportion of its lift is directed forwards. The rotor may, like a propeller, be powered by a variety of methods such as a piston engine or turbine. Experiments have also used jet nozzles at the rotor blade tips . Aircraft are designed according to many factors such as customer and manufacturer demand, safety protocols and physical and economic constraints. For many types of aircraft

682-577: A rigid basket or gondola slung below it to carry its payload. Early aircraft, including airships , often employed flexible doped aircraft fabric covering to give a reasonably smooth aeroshell stretched over a rigid frame. Later aircraft employed semi- monocoque techniques, where the skin of the aircraft is stiff enough to share much of the flight loads. In a true monocoque design there is no internal structure left. The key structural parts of an aircraft depend on what type it is. Lighter-than-air types are characterised by one or more gasbags, typically with

SECTION 10

#1732802324101

744-420: A supporting structure of flexible cables or a rigid framework called its hull. Other elements such as engines or a gondola may also be attached to the supporting structure. Heavier-than-air types are characterised by one or more wings and a central fuselage . The fuselage typically also carries a tail or empennage for stability and control, and an undercarriage for takeoff and landing. Engines may be located on

806-727: Is velodrome , an arena for velocipedes . Αεροδρόμιο is the word for airport in Modern Greek, which transliterates as aerodromio. In British military usage, the Royal Flying Corps in the First World War , and the Royal Air Force in the First and Second World Wars , used the term—it had the advantage that their French allies, on whose soil they were often based, and with whom they co-operated, used

868-549: Is "a defined area on land or water (including any buildings, installations, and equipment) intended to be used either wholly or in part for the arrival, departure, and surface movement of aircraft." The word aerodrome derives from Ancient Greek ἀήρ (aḗr), air , and δρόμος (drómos), road or course , literally meaning air course . An ancient linguistic parallel is hippodrome (a stadium for horse racing and chariot racing ), derived from ἵππος (híppos), horse , and δρόμος (drómos), course . A modern linguistic parallel

930-522: Is a lifting body , which has no wings, though it may have small stabilizing and control surfaces. Wing-in-ground-effect vehicles are generally not considered aircraft. They "fly" efficiently close to the surface of the ground or water, like conventional aircraft during takeoff. An example is the Russian ekranoplan nicknamed the " Caspian Sea Monster ". Man-powered aircraft also rely on ground effect to remain airborne with minimal pilot power, but this

992-429: Is a vehicle that is able to fly by gaining support from the air . It counters the force of gravity by using either static lift or the dynamic lift of an airfoil , or, in a few cases, direct downward thrust from its engines. Common examples of aircraft include airplanes , helicopters , airships (including blimps ), gliders , paramotors , and hot air balloons . The human activity that surrounds aircraft

1054-568: Is a location from which aircraft flight operations take place, regardless of whether they involve air cargo , passengers, or neither, and regardless of whether it is for public or private use. Aerodromes include small general aviation airfields, large commercial airports, and military air bases . The term airport may imply a certain stature (having satisfied certain certification criteria or regulatory requirements) that not all aerodromes may have achieved. That means that all airports are aerodromes, but not all aerodromes are airports. Usage of

1116-437: Is a powered one. A powered, steerable aerostat is called a dirigible . Sometimes this term is applied only to non-rigid balloons, and sometimes dirigible balloon is regarded as the definition of an airship (which may then be rigid or non-rigid). Non-rigid dirigibles are characterized by a moderately aerodynamic gasbag with stabilizing fins at the back. These soon became known as blimps . During World War II , this shape

1178-470: Is an aerodrome with significant facilities to support aircraft and crew. The term is usually reserved for military bases, but also applies to civil seaplane bases . An airstrip is a small aerodrome that consists only of a runway with perhaps fueling equipment. They are generally in remote locations, e.g. Airstrips in Tanzania . Many airstrips (now mostly abandoned) were built on the hundreds of islands in

1240-661: Is an area of open water used regularly by seaplanes , floatplanes and amphibious aircraft for landing and taking off. It may have a terminal building on land and/or a place where the plane can come to shore and dock like a boat to load and unload (for example, Yellowknife Water Aerodrome ). Some are co-located with a land based airport and are certified airports in their own right. These include Vancouver International Water Airport and Vancouver International Airport . Others, such as Vancouver Harbour Flight Centre have their own control tower, Vancouver Harbour Control Tower . The Canadian Aeronautical Information Manual says "...for

1302-478: Is called aviation . The science of aviation, including designing and building aircraft, is called aeronautics . Crewed aircraft are flown by an onboard pilot , whereas unmanned aerial vehicles may be remotely controlled or self-controlled by onboard computers . Aircraft may be classified by different criteria, such as lift type, aircraft propulsion (if any), usage and others. Flying model craft and stories of manned flight go back many centuries; however,

SECTION 20

#1732802324101

1364-452: Is only because they are so underpowered—in fact, the airframe is capable of flying higher. Rotorcraft, or rotary-wing aircraft, use a spinning rotor with aerofoil cross-section blades (a rotary wing ) to provide lift. Types include helicopters , autogyros , and various hybrids such as gyrodynes and compound rotorcraft. Helicopters have a rotor turned by an engine-driven shaft. The rotor pushes air downward to create lift. By tilting

1426-623: Is stored in tanks, usually in the wings but larger aircraft also have additional fuel tanks in the fuselage . Propeller aircraft use one or more propellers (airscrews) to create thrust in a forward direction. The propeller is usually mounted in front of the power source in tractor configuration but can be mounted behind in pusher configuration . Variations of propeller layout include contra-rotating propellers and ducted fans . Many kinds of power plant have been used to drive propellers. Early airships used man power or steam engines . The more practical internal combustion piston engine

1488-475: Is the Lockheed SR-71 Blackbird , a U.S. reconnaissance jet fixed-wing aircraft, having reached 3,530 km/h (2,193 mph) on 28 July 1976. Gliders are heavier-than-air aircraft that do not employ propulsion once airborne. Take-off may be by launching forward and downward from a high location, or by pulling into the air on a tow-line, either by a ground-based winch or vehicle, or by

1550-563: The An-2 , the ancestor of the great Antonov family, designed by Oleg Konstantinovich Antonov . The plant produced 18 modifications of the An-2: transport, passenger, agricultural, water bomber for fighting forest fires, a version for fish shoals exploration, a version for scientific and rescue operations in Arctic conditions, etc. The “Aviant” plant manufactured 3,320 An-2s. Between 1954 and 1956

1612-629: The Bell Boeing V-22 Osprey ), tiltwing , tail-sitter , and coleopter aircraft have their rotors/ propellers horizontal for vertical flight and vertical for forward flight. The smallest aircraft are toys/recreational items, and nano aircraft . The largest aircraft by dimensions and volume (as of 2016) is the 302 ft (92 m) long British Airlander 10 , a hybrid blimp, with helicopter and fixed-wing features, and reportedly capable of speeds up to 90 mph (140 km/h; 78 kn), and an airborne endurance of two weeks with

1674-693: The Boeing 747 jet airliner/transport (the 747-200B was, at its creation in the 1960s, the heaviest aircraft ever built, with a maximum weight of over 400 t (880,000 lb)), and the double-decker Airbus A380 "super-jumbo" jet airliner (the world's largest passenger airliner). The fastest fixed-wing aircraft and fastest glider, is the Space Shuttle , which re-entered the atmosphere at nearly Mach 25 or 17,500 mph (28,200 km/h) The fastest recorded powered aircraft flight and fastest recorded aircraft flight of an air-breathing powered aircraft

1736-637: The Harrier jump jet and Lockheed Martin F-35B take off and land vertically using powered lift and transfer to aerodynamic lift in steady flight. A pure rocket is not usually regarded as an aerodyne because its flight does not depend on interaction with the air at all (and thus can even fly in the vacuum of outer space ); however, many aerodynamic lift vehicles have been powered or assisted by rocket motors. Rocket-powered missiles that obtain aerodynamic lift at very high speed due to airflow over their bodies are

1798-502: The KHAI-1 . It had a speed of 324 km/h, a ceiling of 7000 m and a range of over 1,000 km with a payload of up to 1,000 kg. It was the first European airplane with retractable landing gear. The maiden flight was on 8 October 1932. A total of 43 KHAI-1 were manufactured. In 1937 the works manufactured the OKO-1 . In 1939-1941 the facilities began assembly of MiG aircraft. When

1860-640: The Pacific Ocean during the Second World War. A few airstrips grew to become full-fledged airbases as the strategic or economic importance of a region increased over time. An advanced landing ground was a temporary airstrip used by the Allies in the run-up to and during the invasion of Normandy , and these were built both in Britain, and on the continent. A water aerodrome or seaplane base

1922-517: The cognate term aérodrome . In Canada and Australia, aerodrome is a legal term of art for any area of land or water used for aircraft operation, regardless of facilities. International Civil Aviation Organization (ICAO) documents use the term aerodrome , for example, in the Annex to the ICAO Convention about aerodromes, their physical characteristics, and their operation. However,

Antonov Serial Production Plant - Misplaced Pages Continue

1984-435: The 1930s, large intercontinental flying boats were also sometimes referred to as "ships of the air" or "flying-ships".  — though none had yet been built. The advent of powered balloons, called dirigible balloons, and later of rigid hulls allowing a great increase in size, began to change the way these words were used. Huge powered aerostats, characterized by a rigid outer framework and separate aerodynamic skin surrounding

2046-507: The Aviant produced the prototype of the military transport aircraft An-8 , a twin-engine turboprop. It was the first of a long line of Antonov aircraft with high wings and rear loading cargo ramps. Between 1959 and 1978 the plant manufactured the An-24 (1,028 airplanes produced). It is in 1967 that the plant was renamed “Kyiv Aircraft Plant”, or “Organization Mailbox M-5249”. From 1969 to 1985

2108-470: The aircraft's weight. There are two ways to produce dynamic upthrust — aerodynamic lift by having air flowing past an aerofoil (such dynamic interaction of aerofoils with air is the origin of the term "aerodyne"), or powered lift in the form of reactional lift from downward engine thrust . Aerodynamic lift involving wings is the most common, and can be achieved via two methods. Fixed-wing aircraft ( airplanes and gliders ) achieve airflow past

2170-501: The autogyro moves forward, air blows upward across the rotor, making it spin. This spinning increases the speed of airflow over the rotor, to provide lift. Rotor kites are unpowered autogyros, which are towed to give them forward speed or tethered to a static anchor in high-wind for kited flight. Compound rotorcraft have wings that provide some or all of the lift in forward flight. They are nowadays classified as powered lift types and not as rotorcraft. Tiltrotor aircraft (such as

2232-435: The design process is regulated by national airworthiness authorities. The key parts of an aircraft are generally divided into three categories: The approach to structural design varies widely between different types of aircraft. Some, such as paragliders, comprise only flexible materials that act in tension and rely on aerodynamic pressure to hold their shape. A balloon similarly relies on internal gas pressure, but may have

2294-843: The early aerodromes obsolete. The unimproved airfield remains a phenomenon in military aspects. The DHC-4 Caribou served in the United States military in Vietnam (designated as the CV-2), landing on rough, unimproved airfields where the C-130 Hercules workhorse could not operate. Earlier, the Ju 52 and Fieseler Storch could do the same, one example of the latter taking off from the Führerbunker whilst completely surrounded by Soviet troops. In colloquial use in certain environments,

2356-477: The first manned ascent — and safe descent — in modern times took place by larger hot-air balloons developed in the 18th century. Each of the two World Wars led to great technical advances. Consequently, the history of aircraft can be divided into five eras: Lighter-than-air aircraft or aerostats use buoyancy to float in the air in much the same way that ships float on the water. They are characterized by one or more large cells or canopies, filled with

2418-532: The first true manned, controlled flight in 1853. The first powered and controllable fixed-wing aircraft (the airplane or aeroplane) was invented by Wilbur and Orville Wright . Besides the method of propulsion (if any), fixed-wing aircraft are in general characterized by their wing configuration . The most important wing characteristics are: A variable geometry aircraft can change its wing configuration during flight. A flying wing has no fuselage, though it may have small blisters or pods. The opposite of this

2480-418: The fuselage or wings. On a fixed-wing aircraft the wings are rigidly attached to the fuselage, while on a rotorcraft the wings are attached to a rotating vertical shaft. Smaller designs sometimes use flexible materials for part or all of the structure, held in place either by a rigid frame or by air pressure. The fixed parts of the structure comprise the airframe . The source of motive power for an aircraft

2542-514: The gas bags, were produced, the Zeppelins being the largest and most famous. There were still no fixed-wing aircraft or non-rigid balloons large enough to be called airships, so "airship" came to be synonymous with these aircraft. Then several accidents, such as the Hindenburg disaster in 1937, led to the demise of these airships. Nowadays a "balloon" is an unpowered aerostat and an "airship"

Antonov Serial Production Plant - Misplaced Pages Continue

2604-457: The most part, all of Canada can be an aerodrome", however, there are also "registered aerodromes" and "certified airports". To become a registered aerodrome, the operator must maintain certain standards and keep the Minister of Transport informed of any changes. To be certified as an airport the aerodrome, which usually supports commercial operations, must meet safety standards. Nav Canada ,

2666-556: The plant manufactured the transport An-26 (1,402 airplanes produced). In 1973 an aerial photography aircraft was produced, the An-30 (123 airplanes produced). On April 30, 1974, the plant was renamed once again to be baptised “Kyiv Aviation Production Association”. Between 1976 and 1979 the plant manufactured a pilot batch of the An-72 (5 airplanes produced). Series production of the An-72

2728-489: The plant was bombed on 25 June 1941, the works were evacuated to Novosibirsk , to V.P. Chkalov Facilities where it produced the fighters Yak-3 , Yak-6 and Yak-9 designed by Alexander Sergeyevich Yakovlev . After Kyiv was liberated from the Nazis, the plant was returned there, where until the end of the war it overhauled PO-2 aircraft and assembled Yak-3 and Yak-9 fighters from parts manufactured elsewhere. In 1944

2790-466: The plant was renamed "Plant 473", or "Organization Mailbox 11". After the end of the war the plant was moved to the present location in Sviatoshin , which it had started to develop before 1941. In 1947-1948 the plant manufactured a pilot batch of five helicopters Mi-1 designed by Mikhail Mil , but the series production was transferred to another enterprise. In 1948 the works started production of

2852-449: The plant was renamed “Remvozdukh-6”. In 1925 the first domestic aircraft, the K-1 , was designed and built under guidance of the designer Konstyantyn Kalinin . The maiden flight was 26 July 1925. In 1931 the plant was renamed “Plant 43”. In 1932 the facilities produced the first domestic gyroplane “4-EA” TSAGI . The same year, production of the first domestic high-speed 6-seater aircraft began,

2914-928: The private company responsible for air traffic control services in Canada, publishes the Canada Flight Supplement , a directory of all registered Canadian land aerodromes, as well as the Canada Water Aerodrome Supplement (CWAS). Casement Aerodrome is the main military airport used by the Irish Air Corps . The term "aerodrome" is used for airports and airfields of lesser importance in Ireland, such as those at Abbeyshrule ; Bantry ; Birr ; Inisheer ; Inishmaan ; Inishmore ; Newcastle, County Wicklow ; and Trim . Aircraft An aircraft ( pl. : aircraft)

2976-411: The rotor forward, the downward flow is tilted backward, producing thrust for forward flight. Some helicopters have more than one rotor and a few have rotors turned by gas jets at the tips. Some have a tail rotor to counteract the rotation of the main rotor, and to aid directional control. Autogyros have unpowered rotors, with a separate power plant to provide thrust. The rotor is tilted backward. As

3038-436: The second type of aircraft to fly, the first being kites , which were also first invented in ancient China over two thousand years ago (see Han Dynasty ). A balloon was originally any aerostat, while the term airship was used for large, powered aircraft designs — usually fixed-wing. In 1919, Frederick Handley Page was reported as referring to "ships of the air," with smaller passenger types as "Air yachts." In

3100-446: The shuttle Buran . Yet, as the space program was suspended, only one An-225 "Mriya" was produced. On 5 August 1992, the plant was yet again renamed “National Enterprise Kyiv Aviation Plant” before being renamed on 27 August 1995, to “Kyiv Aviation Plant Aviant” and in 2010 to its present name “Antonov Serial Production Plant”. On 14 March 2022, it was severely damaged by the Russian military airforce. Aerodrome An aerodrome

3162-682: The term "aerodrome" (or "airfield") remains more common in Commonwealth English , and is conversely almost unknown in American English , where the term "airport" is applied almost exclusively. A water aerodrome is an area of open water used regularly by seaplanes , floatplanes or amphibious aircraft for landing and taking off. In formal terminology, as defined by the International Civil Aviation Organization (ICAO), an aerodrome

SECTION 50

#1732802324101

3224-479: The terms airport and aerodrome are often interchanged. However, in general, the term airport may imply or confer a certain stature upon the aviation facility that other aerodromes may not have achieved. In some jurisdictions, airport is a legal term of art reserved exclusively for those aerodromes certified or licensed as airports by the relevant civil aviation authority after meeting specified certification criteria or regulatory requirements. An air base

3286-539: The terms airfield or airport mostly superseded use of aerodrome after the Second World War, in colloquial language. In the early days of aviation, when there were no paved runways and all landing fields were grass, a typical airfield might permit takeoffs and landings in only a couple of directions, much like today's airports, whereas an aerodrome was distinguished, by virtue of its much greater size, by its ability to handle landings and takeoffs in any direction. The ability to always take off and land directly into

3348-530: The tether or kite line ; they rely on virtual or real wind blowing over and under them to generate lift and drag. Kytoons are balloon-kite hybrids that are shaped and tethered to obtain kiting deflections, and can be lighter-than-air, neutrally buoyant, or heavier-than-air. Powered aircraft have one or more onboard sources of mechanical power, typically aircraft engines although rubber and manpower have also been used. Most aircraft engines are either lightweight reciprocating engines or gas turbines . Engine fuel

3410-447: The wind, regardless of the wind's direction, was an important advantage in the earliest days of aviation when an airplane's performance in a crosswind takeoff or landing might be poor or even dangerous. The development of differential braking in aircraft, improved aircraft performance, utilization of paved runways, and the fact that a circular aerodrome required much more space than did the "L" or triangle shaped airfield, eventually made

3472-460: The wind, though normally the pilot can control the altitude, either by heating the air or by releasing ballast, giving some directional control (since the wind direction changes with altitude). A wing-shaped hybrid balloon can glide directionally when rising or falling; but a spherically shaped balloon does not have such directional control. Kites are aircraft that are tethered to the ground or other object (fixed or mobile) that maintains tension in

3534-431: The wing. A flexible wing is a wing made of fabric or thin sheet material, often stretched over a rigid frame, similar to the flight membranes on many flying and gliding animals . A kite is tethered to the ground and relies on the speed of the wind over its wings, which may be flexible or rigid, fixed, or rotary. With powered lift, the aircraft directs its engine thrust vertically downward. V/STOL aircraft, such as

3596-402: The wings by having the entire aircraft moving forward through the air, while rotorcraft ( helicopters and autogyros ) do so by having mobile, elongated wings spinning rapidly around a mast in an assembly known as the rotor . As aerofoils, there must be air flowing over the wing to create pressure difference between above and below, thus generating upward lift over the entire wetted area of

3658-675: Was of the NASA X-43 A Pegasus , a scramjet -powered, hypersonic , lifting body experimental research aircraft, at Mach 9.68 or 6,755 mph (10,870 km/h) on 16 November 2004. Prior to the X-43A, the fastest recorded powered airplane flight, and still the record for the fastest manned powered airplane, was the North American X-15 , rocket-powered airplane at Mach 6.7 or 7,274 km/h (4,520 mph) on 3 October 1967. The fastest manned, air-breathing powered airplane

3720-522: Was transferred to Kharkiv facilities, and “Aviant” was charged with mastering production of the unique An-124 "Ruslan", the world's biggest aircraft. Between 1979 and 2004 the plant produced 19 An-124s. Since 1979 the plant has been manufacturing the An-32 ; as of May 1, 2004, 361 had been produced. From 1985 to 1988 the plant participated in the manufacture of parts for the An-225 "Mriya", designed to carry

3782-490: Was used for virtually all fixed-wing aircraft until World War II and is still used in many smaller aircraft. Some types use turbine engines to drive a propeller in the form of a turboprop or propfan . Human-powered flight has been achieved, but has not become a practical means of transport. Unmanned aircraft and models have also used power sources such as electric motors and rubber bands. Jet aircraft use airbreathing jet engines , which take in air, burn fuel with it in

SECTION 60

#1732802324101

3844-439: Was widely adopted for tethered balloons ; in windy weather, this both reduces the strain on the tether and stabilizes the balloon. The nickname blimp was adopted along with the shape. In modern times, any small dirigible or airship is called a blimp, though a blimp may be unpowered as well as powered. Heavier-than-air aircraft or aerodynes are denser than air and thus must find some way to obtain enough lift that can overcome

#100899