B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Less Severe
Air Traffic Control Provided Assistance; Flight Crew Diverted; Flight Crew Landed in Emergency Condition; General Maintenance Action
Aircraft
In level cruise flight with right engine generator on MEL; APU shut down with APU fault message. Contacted Dispatch and diverted to ZZZZ for an overweight landing.
Dispatched with inoperative main engine generator on MEL. APU started at gate; planned to run APU the entire flight per MEL. APU faulted and shutdown in cruise. Dispatch and [Maintenance Control] on SAT phone decided ZZZZ best divert field. Proceeded to ZZZZ; [requested priority handling] to land 25;000 lbs. overweight and avoid having to dump fuel. Touchdown at 150 fpm; all entered into logbook. I was [Relief Pilot] on the flight; recalled from 1st break. Assisted with monitoring the flying pilot and communicated with cabin team and ZZZZ.
B767 flight crew reported APU failure during cruise resulting in a diversion.