B757 Undifferentiated or Other Model
Flight Crew Last 90 Days 150; Flight Crew Total 14000; Flight Crew Type 5000
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Aircraft Automation Overrode Flight Crew; Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Landed in Emergency Condition; General Declared Emergency
Aircraft
Aircraft dispatched with deferred LEFT ENGINE PRIMARY CONTROL status message displayed. Takeoff roll [was] normal. At approximately 600 AGL the left engine experienced a compressor stall and slight surging; followed by idle power setting as indicated on the left EPR and N1 indicators. Tower initiated hand-off to Departure. I declared an emergency with an engine failure and decided to return to the departure airport. As I began to discuss the engine failure procedure with the Captain; the left engine was beginning to develop thrust and EPR/N1 was increasing. Engine was idle power for approximately 10 seconds. Reported to Departure that engine was once again operating; and reaffirmed our emergency status and return to land. I took control as pilot flying while Captain did pilot not flying duties and executed the compressor stall/surge checklist and communicated with company.ATC provided priority and vectors for an ILS. We coordinated with [airport] operations on VHF for a return and had them notify Maintenance and Dispatch of our situation. Approach and landing were normal. Emergency trucks were standing by on arrival.
During climb from [the airport] leaving approximately 800 FT AGL we experience a compressor stall and subsequent loss of thrust on the left engine. After getting the aircraft stabilized I gave the aircraft to the copilot while I ran the engine surge/stall checklist. Although we had both engine primary and secondary control EICAS status messages the engine continued to run within parameters and was controllable. We therefore elected to leave it running for an overweight landing back into [the airport].
During initial climb; the B757's left engine lost power; an emergency was declared and flight returned to the airport.