B737-700
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 110; Flight Crew Type 16000
Aircraft Equipment Problem Critical; Inflight Event / Encounter Other / Unknown
Flight Crew Diverted; Flight Crew Landed in Emergency Condition; General Flight Cancelled / Delayed
Aircraft; MEL
Enroute from ZZZ to ZZZ1. Aircraft had MEL for #2 engine generator. Dispatched with APU powering #2 transfer bus. At 35;000 ft. over ZZZ2; APU failed and did automatic shutdown. We diverted to ZZZ2 due to only one AC power source remaining. Uneventful approach and landing. Multiple; unforeseen failures caused the event.
Right generator was MEL'd after gate return at ZZZ. MEL required APU to be operated continuously on the ZZZ - ZZZ1 leg. During cruise FL350 the APU failed; leaving us with a single generator. Accomplished QRH items for 'APU low oil pressure' and decided to divert to ZZZ2 due to the requirement to land at [the] 'nearest suitable airport' from MEL and QRH. [Requested priority handling] in the descent due to [the] nature of [the] malfunction and overweight landing. Landed uneventfully in ZZZ2 6;000 lb. overweight. At ZZZ2 we deplaned passengers; and after a six-hour delay; the APU was repaired and overweight inspection [was] completed. Completed flight to ZZZ1 uneventfully.
B737-700 flight crew reported an APU failure inflight combined with an MEL'd engine generator resulted in single-generator operations; which led to a diversion to the nearest suitable airport.