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51-615: In mid-1970, Avco Lycoming was advertising two Lycoming T55 -derived engines, an LTC4B-12 turboprop and an ALF 502A turbofan, as possible powerplants for the U.S. Air Force 's A-X close air support aircraft program. Northrop Corporation signed a contract with Avco Lycoming to use the ALF 502A for its entry into the A-X competition, the Northrop YA-9 , in January 1971. The engine was given

102-597: A United States military aircraft engine designation of YF102-LD-100. Six YF102 engines were built for the YA-9. The 7,500 lbf (33 kN) thrust engines powered the A-9A prototypes for seven months of flight tests in 1972, recording 238 flights and 652 flight hours. These engines were later reused in the C-8A Quiet Short-Haul Research Aircraft (QSRA). The commercial ALF 502D engine

153-622: A specific fuel consumption of 0.302 lb/(lbf⋅h) (8.6 g/(kN⋅s)) and a fan tip diameter of 48.0 in (1,220 mm). Lycoming announced its LF500 family of turbofans in September 1988, starting with the LF507-1H and LF507-1F, which were certificated in October 1991 and March 1992, respectively. In June 1992, the company outlined improvements to the LF500 family's core, which included

204-626: A -102, was built in 2005. In April 2008, Bombardier announced that production of the remaining classic versions (Series Q200 and Q300) would be ended, leaving the Series Q400 as the only Dash 8 still in production. Production of the Q200 and Q300 was to cease in May 2009. A total of 672 Dash 8 classics were produced; the last one was delivered to Japan Coast Guard in August 2008. Continuing on with

255-428: A C-check. By August 2018, the 90-seat variant was certified before delivery to launch customer SpiceJet later in the same year. In March 2021, EASA certified the 90-seat variant for European operations; DHC believed that there were opportunities with prospective European customers as of 2021 . On November 8, 2018, Canadian company Longview Aviation Capital Corporation, through its subsidiary Viking Air , acquired

306-603: A dispatch reliability over 99.5%. By July 2018, 844 Dash 8s were in airline service: 143 Series 100 with 35 operators, 42 Series 200 with 16 operators, 151 Series 300 with 32 operators and 508 Q400s. By then, 56 orders were in backlog. The DHC-8 has been involved in 80 aviation accidents and incidents including 31 hull losses . Those resulted in 180 fatalities. In September 2007, two separate accidents of similar landing gear failures occurred within four days of each other on Scandinavian Airlines (SAS) Dash 8-Q400 aircraft. A third accident occurred in October 2007, leading to

357-488: A few hours later, Bombardier recommended that all Q400s with more than 10,000 flights be grounded until further notice. This affected about 60 aircraft, out of 140 Q400s then in service. On October 27, 2007, Scandinavian Airlines Flight 2867 en route from Bergen to Copenhagen had severe problems with the landing gear during landing in Kastrup Airport. The right wing gear did not deploy properly (or partially), and

408-571: A high-density, 90-seat layout of the Q400, which would enter service in 2018; keeping the 28 in (71 cm) seat pitch of the Nok Air 86-seats, an extra row of seats is allowed by changing the configuration of the front right door and moving back the aft pressure bulkhead . The payload is increased by 2,000 pounds (910 kg) and the aircraft maintenance check intervals are increased: 800 hours from 600 for an A-check and 8,000 hours from 6,000 for

459-552: A market DHC felt would be compelling. However, only a handful of air carriers employed the Dash 7, as most regional airlines were more concerned about the operational costs (fuel and maintenance) of four engines, rather than the benefits of short-field performance. In 1980, de Havilland responded by dropping the short-field performance requirement and adapting the basic Dash 7 layout to use only two, more powerful engines. Its favoured engine supplier, Pratt & Whitney Canada , developed

510-457: A maximum capacity of 39, the Series 200 has the same capacity but offers more powerful engines, the Series 300 is a stretched, 50-seat version, and the Series 400 is further stretched to a maximum of 90 passengers. Models delivered after 1997 have cabin noise suppression and are designated with the prefix "Q". Production of the Series 100 ceased in 2005, followed by the 200 and 300 in 2009, leaving

561-455: A new factory refurbishment programme. In the 1970s, de Havilland Canada had invested heavily in its Dash 7 project, concentrating on STOL and short-field performance, the company's traditional area of expertise. Using four medium-power engines with large, four-bladed propellers resulted in comparatively lower noise levels, which combined with its excellent STOL characteristics, made the Dash 7 suitable for operating from small in-city airports,

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612-569: A property transaction made by Bombardier before the 2019 sale to DHC, DHC had to vacate its Downsview , Toronto, manufacturing facility in August 2022, and as of August 2023 is planning to restart Dash 8 production in Wheatland County, Alberta , by 2033. At the July 2024 Farnborough International Air Show , DHC announced orders for seven Series 400 aircraft, an order for a newly introduced quick-change combi aircraft conversion kit, and

663-695: A scaled-up version of the smaller Lycoming T53 . The T55 serves as the engine on several major applications including the CH-47-Chinook, the Bell 309, and the Piper PA-48 Enforcer. The T55 also serves as the core of the Lycoming ALF 502 turbofan . Since the T55 was first developed, progressive increases in airflow , overall pressure ratio, and turbine inlet temperature have more than tripled

714-733: A temperature margin increase of 248 °F (120 °C) in the turbine. Lycoming introduced the 500 Series of common core engines of turboprops and turbofans in February 1994 as a derivative of the LF507 to power regional aircraft in the late 1990s. A turboprop version also was planned for the European Future Large Aircraft military transport (which would eventually become the Airbus A400M ). AlliedSignal, which took over Lycoming in October 1994, demonstration tested

765-450: A wide-chord fan to move more air, uprated fan gearbox , three-stage power turbine (an increase from two stages), more lighter-weight composite materials , increased diameter in the first three stages of the axial compressor to increase airflow by 17 percent, an improved impeller (centrifugal compressor) with lean-back vanes, a 16-lobe forced exhaust mixer to reduce noise and specific fuel consumption (SFC), an advanced combustor , and

816-429: Is 80,000 flight cycles. Under an extended service program launched in 2017, the service life of Dash 8-300 is extended by 50 percent, or approximately 15 years, to 120,000 flight cycles. The Series 400 introduced an even longer airframe that was stretched 6.83 metres (22.4 ft) over the Series 300 (10.26 metres (33.7 ft) over the Series 100/200), had slightly more wing span due to a larger wing section inboard of

867-627: Is a turboshaft engine used on American helicopters and fixed-wing aircraft (in turboprop form) since the 1950s, and in unlimited hydroplanes since the 1980s. As of 2021, more than 6,000 of these engines have been built. It is produced by Honeywell Aerospace , a division of Honeywell based in Phoenix, Arizona, and was originally designed by the Turbine Engine Division of Lycoming Engines in Stratford, Connecticut , as

918-441: Is offered, which increases maximum operating altitude to 27,000 ft (8,200 m). Between its service entry in 2000 and the 2018 sale to Longview/Viking, 585 had been delivered at a rate of 30-35 per year, leaving a backlog of 65 at the time of the 2018 sale. In 2017, its unit cost was US$ 32.2 million. By 2017, the Q400 aircraft had logged 7 million flight hours with 60 operators and transported over 400 million passengers with

969-581: The Tanzania Government Flight Agency . The company also announced the launch of a factory refurbishment programme, for which 28 aircraft had been purchased, along with new freighter and combi aircraft conversion kits; one of the latter had been ordered by Advantage Air, DHC said. In December 2021, DHC entered into a partnership with ZeroAvia with a view to offering the ZA-2000 hydrogen-electric propulsion as an option for

1020-697: The 2,200 ft (670 m) required by a fully laden Dash 7. The introduction of the regional jet altered the sales picture. Although more expensive than turboprops, regional jets allow airlines to operate passenger services on routes not suitable for turboprops. Turboprop aircraft have lower fuel consumption and can operate from shorter runways than regional jets, but have higher engine maintenance costs, shorter ranges, and slower cruising speeds. When world oil prices drove up short-haul airfares in 2006, an increasing number of airlines that had bought regional jets began to reassess turboprop regional airliners, which use about 30–60% less fuel than regional jets. Although

1071-495: The 2019 sale to DHC, DHC decommissioned its Downsview , Toronto, manufacturing facility in August 2022, and in 2023 confirmed its plans to restart Dash 8 production in Wheatland County, Alberta , outside of Calgary, by 2033. At the Farnborough International Airshow in July 2024, DHC announced orders for seven Series 400 aircraft, including one for Skyward Express , two for Widerøe , and one for

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1122-557: The ALF 502's biggest customer. A total of 1,019 ALF 502 engines of all variants were produced. The LF 507 series based on the ALF 502R was announced in September 1988. The series initially consisted of the hydromechanically controlled LF 507-1H and the FADEC -controlled LF 507-1F, both offering 7,000 lbf (31 kN) of thrust. Both variants were used on the Avro RJ update of the BAe 146, and

1173-466: The DHC-8, as a line-fit option for new aircraft and as an approved retrofit for existing aircraft. In May 2023, ZeroAvia unveiled a DHC-8 Q400 donated by Alaska Airlines for use as a testbed aircraft. Distinguishing features of the Dash 8 design are the large T-tail intended to keep the tail free of prop wash during takeoff, a very high aspect ratio wing, the elongated engine nacelles also holding

1224-717: The De Havilland Canada brand. Powered by two Pratt & Whitney Canada PW150s , it was developed from the Dash 7 with improved cruise performance and lower operational costs, but without STOL performance. The Dash 8 was offered in four sizes: the initial Series 100 (1984–2005), the more powerful Series 200 (1995–2009) with 37–40 seats, the Series 300 (1989–2009) with 50–56 seats, and Series 400 (1999–2022) with 68–90 seats. The QSeries (Q for quiet) are post-1997 variants fitted with active noise control systems. Per

1275-531: The LF 507-1F was also used on the BAe 146. 818 LF 507 engines were produced. In 2020, Honeywell sold the type certificate to CFS Aeroproducts Inc. (Arizona), a subsidiary of MRO provider CFS Aeroproducts Ltd (UK), then transferred in January 2021. In 1972, Lycoming and NASA published a study describing the ALF504, a 12.5 bypass ratio engine producing 8,370 lbf (3,800 kgf; 37.2 kN) of sea-level thrust at

1326-561: The Q400 as the only series still in production. The Series 100 was the original 37-39 passenger version of the Dash 8 that entered service in 1984. The original engine was the Pratt & Whitney Canada PW120 and later units used the PW121. Rated engine power is 1,800 shp (1,340 kW). The Series 200 aircraft maintained the same 37–39 passenger airframe as the original Series 100, but was re-engined for improved performance. The Series 200 used

1377-521: The Q400's centre fuselage. The Q400 components are chemically milled while older variants are assembled from bonded panels and skins. The production of the Dash 8 Series 100 stopped in 2005, and that of the Series 200 and 300 in 2009. Bombardier proposed the development of a Q400 stretch with two plug-in segments, called the Q400X project, in 2007. It would compete in the 90-seat market range. In response to this project, as of November 2007 , ATR

1428-613: The Q400, the 1,000th Dash 8 was delivered in November 2010. Bombardier aimed to produce the Q400 more economically. A deal with its machinists union in June 2017 allowed the assembly of the wings and cockpit section outside Canada and searches for potential partners commenced. Bombardier expected to produce the cockpit section in its plant in Queretaro, Mexico , outsourcing the wings to China's Shenyang Aircraft Corp , which already builds

1479-495: The aircraft skidded off the runway in a controlled emergency landing. The Q400 was carrying 38 passengers, two infants, and four crew members on board. No injuries were reported. The next day, SAS permanently removed its entire Dash 8 Q400 fleet from service. In a press release on October 28, 2007, the company's president said: "Confidence in the Q400 has diminished considerably and our customers are becoming increasingly doubtful about flying in this type of aircraft. Accordingly, with

1530-671: The cabin, and the right engine caught fire. Of 69 passengers and four crew on board, 11 were sent to hospital, five with minor injuries. The accident was filmed by a local news channel (TV2-Nord) and broadcast live on national television. Three days later, on September 12, Scandinavian Airlines Flight 2748 from Copenhagen to Palanga had a similar problem with the landing gear, forcing the aircraft to land in Vilnius International Airport ( Lithuania ). No passengers or crew were injured. Immediately after this accident SAS grounded all 33 Q400 airliners in its fleet and,

1581-750: The common core in December; the core was capable of producing 20,000 lbf (89 kN) of thrust . After losing the competition to power the de Havilland Dash 8 -400 regional turboprop, AlliedSignal abandoned the common core effort in July 1995. The ALF502 is a high bypass turbofan with geared fan, axial-centrifugal flow high pressure compressor, reverse flow annular combustor, two-stage high pressure turbine, two-stage low pressure turbine. (LF500 family/Lycoming 500 Series/AlliedSignal AS800) Related development Comparable engines Geared turbofans Related lists Lycoming T55 The Honeywell T55 (formerly Lycoming ; company designation LTC-4 )

Lycoming ALF 502 - Misplaced Pages Continue

1632-510: The contract. It was eventually won by Airbus, which received an order for 34 A320 aircraft. Allegations of secret commissions paid to Prime Minister of Canada Brian Mulroney are today known as the Airbus affair . Following its failure in the competition, Boeing immediately put de Havilland Canada up for sale. The company was eventually purchased by Bombardier in 1992. The market for new aircraft to replace existing turboprops once again grew in

1683-431: The engines, a stouter T-tail and had a passenger capacity of 68–90. The Series 400 uses Pratt & Whitney Canada PW150A engines rated at 4,850 shp (3,620 kW). The aircraft has a cruise speed of 360 knots (667 km/h), which is 60–90 knots (111–166 km/h) higher than its predecessors. The maximum operating altitude is 25,000 ft (7,600 m) for the standard version, although a version with drop-down oxygen masks

1734-441: The entire Dash 8 program and the de Havilland brand from Bombardier, in a deal that would close by the second half of 2019. Viking had already acquired the discontinued de Havilland Canada aircraft model type certificates in 2006. By November 2018, the sales of the higher-performance Q400 were slower than the cheaper aircraft from ATR . Bombardier announced the sale was for $ 300 million and expected $ 250 million net. The sale

1785-499: The factory lease expired in 2023. On February 17, 2021, DHC announced a pause in production, planned for the second half of 2021, due to a lack of Dash 8 orders from airlines. The manufacturer planned to vacate its Downsview Toronto facility and lay off 500 employees in the process. The lay-off notice resulted in Unifor , the union representing the workers, demanding a government bail-out. The company planned to restart production after

1836-550: The market was not as robust as in the 1980s when the first Dash 8s were introduced, 2007 had increased sales of the only two 40+ seat regional turboprops still in western production, Bombardier's Q400 and its competitor, the ATR series of 50– to 70-seat turboprops. The Q400 has a cruising speed close to that of most regional jets, and its mature engines and systems require less frequent maintenance, reducing its disadvantage. The aircraft has been delivered in four series. The Series 100 has

1887-517: The mid-1990s, and DHC responded with the improved "Series 400" design. All Dash 8s delivered from the second quarter of 1996 (including all Series 400s) include the Active Noise and Vibration System designed to reduce cabin noise and vibration levels to nearly those of jet airliners. To emphasize their quietness, Bombardier renamed the go-forward production of Dash 8 models as the "Q"-Series turboprops (Q200, Q300, and Q400). The last Dash 8-100,

1938-524: The more powerful Pratt & Whitney Canada PW123 engines rated at 2,150 shp (1,600 kW). In 2000, its unit cost was US$ 12 million. The Series 300 introduced a longer airframe that was stretched 3.43 metres (11.3 ft) over the Series 100/200 and has a passenger capacity of 50–56. The Series 300 also used the Pratt & Whitney Canada PW123 engines. Rated engine power is between 2,380 shp (1,774 kW) and 2,500 shp (1,864 kW). Design service life

1989-630: The new PW100 series engines for the role, more than doubling the power from its PT6 . Originally designated the PT7A-2R engine, it later became the PW120. When the Dash 8 rolled out on April 19, 1983, more than 3,800 hours of testing had been accumulated over two years on five PW100 series test engines. The Dash 8 first flight was on June 20, 1983. Certification of the PW120 followed on December 16, 1983. The airliner entered service in 1984 with NorOntair , and Piedmont Airlines , formerly Henson Airlines,

2040-581: The newly formed De Havilland Canada (DHC) taking control of the Dash 8 program, including servicing the previous -100, -200, and -300 series. Production of the Q400 was planned to continue at the Downsview, Toronto production facility, under DHC's management. De Havilland was considering a 50-seat shrink, as North American airlines operate 870 ageing 50-seaters, mostly CRJs and Embraer ERJs . There were 17 Dash 8s scheduled for delivery in 2021, and De Havilland planned to pause production after those, while

2091-458: The pandemic at a new location. In July 2022, DHC announced that it would review the Dash 8 programme and supply chain later in the year, and could restart production in the middle of the decade if conditions allowed. The Calgary site, where the company produced DHC-6 Twin Otters , was originally envisioned as the venue for Dash 8 production. Per a property transaction made by Bombardier prior to

Lycoming ALF 502 - Misplaced Pages Continue

2142-438: The power output of the engine. Related development Comparable engines Related lists De Havilland Dash 8 The De Havilland Canada DHC-8 , commonly known as the Dash 8 , is a series of turboprop -powered regional airliners , introduced by de Havilland Canada (DHC) in 1984. DHC was bought by Boeing in 1986, then by Bombardier in 1992, then by Longview Aviation Capital in 2019; Longview revived

2193-516: The rearward-folding landing gear , and the pointed nose profile. The Dash 8 design has better cruise performance than the Dash 7, is less expensive to operate, and is much less expensive to maintain, due largely to having only two engines. It is a little noisier than the Dash 7 and cannot match the STOL performance of its earlier DHC forebears, although it is still able to operate from small airports with runways 3,000 ft (910 m) long, compared to

2244-431: The withdrawal of the type from the airline's fleet. On September 9, 2007, the crew of SAS Flight 1209, en route from Copenhagen to Aalborg , reported problems with the locking mechanism of the right side landing gear, and Aalborg Airport was prepared for an emergency landing. Shortly after touchdown, the right main gear collapsed and the airliner skidded off the runway while fragments of the right propeller shot against

2295-562: Was also chosen for the LearStar 600 executive transport aircraft, which eventually became the Canadair CL-600 Challenger . The CL-600 Challenger first flew in November 1978 and was powered by the 7,500 lbf (33 kN) ALF 502L-2, ALF 502L-2A, and ALF 502L-3 variants. The 6,700 lbf (30 kN) ALF 502R-3 variant initially powered the quad-engine British Aerospace 146 , which entered service in 1983 and became

2346-535: Was developed from the military YF102 in 1971. Its 6,500 lbf (29 kN) derated engine had just one booster compressor stage instead of the YF102's two stages, and operated under a lower turbine temperature to improve reliability. The ALF 502D powered the Dassault Falcon 30 prototype from May 1973 into 1975, logging 270 flight hours until Dassault discontinued development of the aircraft model. The ALF 502D

2397-462: Was projected by Bombardier to result in $ 250 million annual savings. In January 2019, Longview announced that it would establish a new company in Ontario, reviving the de Havilland Aircraft Company of Canada name, to continue production of the Q400 and support the Dash 8 range. By February, the program sale was expected to close at the end of September. On June 3, 2019, the sale was closed with

2448-417: Was still studying the issue, at least a three-year delay was envisioned. In October 2012, a joint development deal with a government-led South Korean consortium was revealed, to develop a 90-seater turboprop regional airliner, targeting a 2019 launch date. The consortium was to have included Korea Aerospace Industries and Korean Air Lines . At the February 2016 Singapore Airshow , Bombardier announced

2499-429: Was still studying the prospects of designing the Q400X and talking with potential customers. At the time, Bombardier was not as committed to the Q400X as it had been previously. In May 2011, Bombardier was still strongly committed to the stretch but envisioned it more likely as a 2015 or later launch. The launch date was complicated by new powerplants from GE and PWC to be introduced in 2016. In February 2012, Bombardier

2550-402: Was studying a 90-seat stretch. In June 2009, Bombardier commercial aircraft president Gary Scott indicated that the Q400X would be "definitely part of our future" for possible introduction in 2013–14, although he did not detail the size of the proposed version or commit to an introduction date. In July 2010, Bombardier's vice president, Phillipe Poutissou, made comments explaining the company

2601-576: Was the first US customer the same year. In 1986, Boeing bought the company in a bid to improve production at DHC's Downsview Airport plants, believing the shared production in Canada would further strengthen their bargaining position with the Canadian government for a new Air Canada order for large intercontinental airliners. Air Canada was a crown corporation at the time, and both Boeing and Airbus were competing heavily via political channels for

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