AlliedSignal's latest APU - the 131-9(B) for the next generation Boeing 737 - has received Technical Standard Order (TSO) authorisation from the FAA, a record 25 months after the programme began.

Designed both to start and operate up to 39,000ft (11,900m), the 131-9(B) incorporates more than 50 design recommendations from customers and is claimed to provide operators with world-class reliability and improved main engine starting and cabin cooling performance.



Source: Flight Daily News