Reply #93: A fat sea gull.

[trof]

Out of SFO on the way to Anchorage early one morning. Didn't know what happened at the time. Got a little vibration at lift off. Engine instruments all looked OK. At about 15,000 feet, while we were still trying to diagnose and locate the problem, the vibration ceased.

Mechanics did a visual inspection of exterior and engines at Anchorage. Nothing. The new crew took it on to Narita (Tokyo International) and reported no problems inflight. At Narita, our main maintenance base, a more detailed inspection revealed damage to compressor blades in one engine and enough dried blood & tissue to indicate a sea gull. They can always be a problem at seaside airports.