Commercial Fixed Wing
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 140; Flight Crew Type 15000
Aircraft Equipment Problem Critical; Inflight Event / Encounter Weather / Turbulence
Flight Crew Diverted; Flight Crew Landed in Emergency Condition
Aircraft; Weather
Had light chop leveling at FL400 requested descent to FL380. Upon leveling at FL380 with autothrottles on; I noticed #1 thrust lever in different position than #2. Engine was not responding to thrust lever movement. I then disengaged autothrottles and moved lever manually. #1 engine remained about 55% for brief time then started to rollback. We requested descent to 200 as engine was slowly rolling back. We ran the Engine Limit Stall or Surge Checklist. We got a Eng Fail light on descent and then started running Engine Failure Checklist. Within 30-60 seconds EGT N1/ N2 began to rise. The engine recovered on its own and parameters were normal until engine shutdown at gate. We advised ATC and diverted to ZZZ. Contacted Dispatch and landed uneventfully.
After level off at FL400 light chop was encountered and we descended to FL380. During the descent the #1 engine thrust was found lower than the commanded thrust and decaying slowly. We then requested a descent to FL200 and began running the Engine Limit; Surge; Stall Checklist. Both thrust levers were retarded to idle in an attempt to recover engine #1. The engine continued to decay until the Engine Fail light illuminated. At that point we started to run the Engine Failure Checklist; but within 30-60 seconds we found the engine had recovered and stabilized in idle. Decision was made to land at nearest suitable field (ZZZ). Engine ran normally from that point all the way to engine shutdown at the gate. Landing was uneventful.
Air carrier flight crew reported a loss of engine power in flight that resulted in a diversion.