Hi everyone, first post so first of all a quick self introduction: I'm the brand new owner of a Bravo (G1000 equipped, dual alternator, one of the last built). I thank you all for your posts, they have been invaluable through deciding to buy a Mooney and to prepare myself for the transition.
I wanted to pick your collective brain on the only (really) negative experience so far with my new plane. I bought her fresh out of annual (at ACG in Germany), during which the alternators where removed for a 500-hr inspection (total time of everything on board is ~1000 hrs). They were shipped to Vliegwerk Holland BV and back.
Exactly 2 hours of flight later, I had a left alt indication (but the alternator was still charging the battery, at least initially). Shortly afterwards, the left alternator stopped charging the battery at all, and upon inspection on landing we noticed the belt being not tense. Removing the cowling, we found that the pulley on the left alt had come loose, damaging the shaft.
The analysis was that probably the torque on its nut/bearing was not correct, and so in flight it had worked for a little while, while vibrations damaged it. The alternator was deemed not repairable and had to be replaced. I count myself lucky that the pulley did not come detached and bounced around at high speed near the prop and the front of the engine, where it could have caused way more damage...
(I apologize in advance for the terminology, the combination of me being the wrong type of engineer and English not being my native language probably made a mess of it)
The correlation between the inspection and the breakage is, to put it mildly, suspicious to me. However, the shop (Vliegwerk Holland, I mean) maintains that they did not remove the pulley and its nut at all, so they cannot be responsible. Nor, apparently, they checked the torque or the conditions of the shaft.
I don't know if anyone has any past experience of similar faults, or any informed opinions to share.
And while I'm at it... merry Christmas everyone!