Hi guys, I had an annual inspection just before Christmas and on the subsequent flight I experienced a very audible change in noise about 5 mins after take off ? engine ? airframe with a slight vibration through the cockpit. It lasted 20-30 seconds and then stopped as suddenly as it begun. A visual inspection of the engine revealed nothing loose and no obvious cause. I know that a plug was changed during the annual. Could a faulty plug cause this?

The next 4 hours were uneventful until yesterday when at the end of a 1.5 hour flight the exact same thing happened. Manifold pressure and RPM were at descent setting and I observed no drop in RPM with the vibration.

Has anyone ever experienced this phenomenon?

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Gerard O Connell
Melbourne, Australia
VH-LPD (LNC2)

 

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