AlliedSignal is developing an auxiliary power unit for the stretched Boeing 767-400, based on the 331-350 unit produced for the Airbus A330 and A340. The new 331-400B provides up to 40% more power than the 767 unit, with a weight increase of less than 13%, says the company. The 331-400B will use the power section of the 331-350, with a new load compressor, gearbox and control system. The first engine test will be carried out in April.
Source: Flight International
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