B767-300 and 300 ER
Aircraft Equipment Problem Less Severe
Flight Crew Returned To Departure Airport; Flight Crew Landed As Precaution; General Declared Emergency; General Maintenance Action
Aircraft
Engine vibration on T/O with wind 100 at 5 KTS / Max Power T/O; rain showers in area. After gear retract there was a slight vibration noticed. Right engine was producing less N1 than the left. At approximately 3;000 FT we matched the N1's; the right throttle was a full knob forward of the left; fuel flow on R was about 4;000 pounds above the left. R.E. LPT vibration was 5.0 (max on scale); temps split between engines. Decision was made to return. Radio calls made to Maintenance; Dispatch; Ramp Tower; ATC; for coordination and advice. Flight attendants notified. Emergency was declared with approach as we were to make an overweight landing (336.0 pounds.) Flight attendants were made aware and kept abreast of the situation. Landing was uneventful. Returned to gate. All applicable log book entries made. The vibration on T/O felt to me as if a cargo container slid aft in the cargo bay at about gear retraction; or shortly thereafter. The vibration was only about 2 seconds in duration with no other vibration felt after that. There were no reports from the cabin; FA's or passengers; about any major vibrations; smoke; oil; or pieces of engine exiting the right engine.
B767-300 flight crew detects a rumbling vibration from the right engine shortly takeoff. With N1 low; N2 near the limit; fuel flow high and LPT vibration at 5.0 the decision is made to return to the departure airport. Maintenance discovers a turbine failure.