On 28-Oct-2003, "Jay Honeck" wrote:

Six weeks ago my attitude indicator gave up the ghost, after slowly dying
over a period of several months. It's been replaced with a re-built unit
that's working fine.

Two days ago my directional gyro abruptly failed.


In close to 2000 hours over 34 years I have never seen a vacuum instrument
suddenly die like that, except when associated with vacuum failure (pump or
vacuum line breakage or disconnection). I suppose it could happen, but
usually it's a slow death like you experienced with your AI.

I'd check to make sure that there is suction to the instrument, not just
visual inspection of the hoses, before I removed it from the plane.

--
-Elliott Drucker