B767-300 flight crew detects a rumbling vibration from the right engine shortly takeoff. With N1 low...

Narrative:

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 right was about 4;000 pounds above the left. Right.east. 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; flight attendant's or passengers; about any major vibrations; smoke; oil; or pieces of engine exiting the right engine.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1197985
Time
Date	201408
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Component
Aircraft Component	Turbine Engine
Person 1
Function	Pilot Not Flying Relief Pilot
Events
Anomaly	Aircraft Equipment Problem Less Severe

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.