B757-200
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport; General Declared Emergency
Aircraft
On climb out left engine surged badly and thumped. Captain took control of aircraft; declared an emergency with Departure and returned to land. Visual approach uneventful with left engine at idle.
On climb; left engine started surging. Control transferred to Captain for return.  Emergency declared.
B757 flight crew experiences left engine surging shortly after takeoff. An emergency is declared and the flight returns to the departure airport with the left engine at idle.