B767-300 and 300 ER
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Aircraft Equipment Problem Less Severe
Air Traffic Control Provided Assistance; Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
I was pilot flying; during climb out at approximately 5;000 ft.; loud banging noise; sounded like compressor stall; autopilot engaged; yawing; left engine N1 reduced to approximately 30%; left engine fuel flow 4000; right engine normal; another bang; yawing; levelled off at 7;000 ft. Left engine went back to normal indications; no yaw. Advised ATC of mechanical issue. EICAS message L eng HPSOV. First Officer Ran QRH; I continued flying. We concurred that return to ZZZ was safest course of action. 2 jumpseaters on board 767 Captains; (1 Flex); sent message to [Operations Control] advising of maintenance issue & return to ZZZ. [We advised ATC] ; conducted ILS ; uneventful approach & landing. Met by emergency vehicles; uneventful taxi to ramp. Maintenance report: Upon left engine stall inspection; found green harness at VBV actuator connector P124 shielding damaged; Pneumatic controller bite test shows HPC fault and HPSOV fault.
B767 Captain reported that a compressor stall during climb resulted in a return to the departure airport.