Honeywell has completed ground testing of the HGT1700 auxiliary power unit (APU) designed for the Airbus A350 XWB.
The company says the APU passed the first engine to test (FETT) phase in October of 2009.
Honeywell explains that unlike its predecessor APUs, the HGT1700 features variable speed during ground operation to cut fuel burn by up to 10%, a new hydraulic bleed valve to improve reliability, an improved combustor to reduce clogging and improved durability. The A350 XWB APU also features new materials to reduce weight. Honeywell also says at 1700 shaft horsepower (SHP), the HGT1700 is the largest APU it has developed.
"The engine weighs less but provides more power," says Honeywell, "allowing it a 13% power-to-weight improvement over 331-500/-600 APUs." Additionally, Honeywell says a starter generator system is designed into the A350 XWB's APU, saving weight and simplifying design while supplying electrical power for the aircraft's system at altitudes of up to 43,100ft (13,137m).
Airbus in September of 2007 awarded Honeywell a $16.5 billion contract covering the A350 XWB's APU and air management system.
Honeywell won a follow-on $1.5 billion contract in March 2008 to supply the aircraft's flight management and environmental surveillance systems.
Source: Air Transport Intelligence news
