6063 x 4035 px | 51,3 x 34,2 cm | 20,2 x 13,5 inches | 300dpi
Aufnahmedatum:
11. September 2012
Ort:
RAF Lossiemouth, Moray. Grampian Region. Scotland. United Kingdom.
Weitere Informationen:
The PA-42-720 Cheyenne III was announced in September 1977. The first production Cheyenne III flew for the first time on May 18, 1979 and FAA certification was granted in early 1980. Compared with the Cheyenne II the PA-42-720 was about 1 m (3 ft) longer, was powered by 537 kW (720-shp) PT6A-41 turboshafts and introduced a T-tail, the most obvious external difference between the PA-31T and PA-42, as well as the most significant change to the series. Deliveries of production Cheyenne IIIs began on June 30, 1980. The standard Cheyenne III has a full complement of deicing equipment, Q-tip propellers, more powerful 250-ampere/hour starter-generators and a 6.3-psi pressurization system backed up by an emergency system operated by the right engine's bleed air. Also, several key upgrades found available for the Cheyenne IA became standard for the III. These included the SAS, redesigned exhaust stubs, which, according to piper, allowed an extra 6 knots (11 km/h) IAS; and a redesigned engine intake air scoop, which allowed for a larger volume of air to enter the engine. In addition, an external air scoop for oil cooling was available instead of using engine intake air. The IIIA superseded the Cheyenne III after 88 of the latter aircraft had been delivered. The IIIA is similar in appearance to the III but has PT6A-61 engines and 300 ampere starter-generators. The PT6A-61 engine delivers the same 720 horsepower (540 kW) but, with an additional axial compressor, carries that horsepower to a higher altitude. The IIIA also features an improved air conditioning system, speed stacks, increased passenger head-room, and more reliable fuel control units. The IIIA's ordered by Lufthansa feature flight decks configured to resemble that airline's Airbus A310. Alitalia also uses the IIIA for training purposes.
