Wacko AI

blanche cohen wrote:
Not to be confused with Yakko or Dot...

Just had the DG replaced (went precessing 60 deg on a 90 deg turn)
yesterday. Ran the engine up and taxi'd to the ramp from the shop.
Things looked ok - no, wait! the AI is upside down. Now, I'm
used to seeing it canted to the right before everything is run up
to speed, but upside down? Waited a few minutes, nothing, but
nothing changed. Unfortunately, the shop was closed by now so I
left it on the ramp and took the bus home.

Much more mystifying...after ALL power was off, engine off, key
out, battery off, etc. the AI dial was spinning. Yes, that's right,
spinning like a top. Fast. And it didn't seem to slow down, either.
I didn't time it, but it just sat there spinning for at least
5 minutes.


Perhaps I may be off on this, but if it seemed stable upside down, is it
possible that it was accurately upside down so that the erecting
mechanism was not able to get it the right way up? I wonder if you had
resored vacuum after it started tumbling whether that would have enabled
it to precess to upright (which may take several minutes)?

Cheers Mark

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In article , DR wrote:
blanche cohen wrote:
Not to be confused with Yakko or Dot...

Just had the DG replaced (went precessing 60 deg on a 90 deg turn)
yesterday. Ran the engine up and taxi'd to the ramp from the shop.
Things looked ok - no, wait! the AI is upside down. Now, I'm
used to seeing it canted to the right before everything is run up
to speed, but upside down? Waited a few minutes, nothing, but
nothing changed. Unfortunately, the shop was closed by now so I
left it on the ramp and took the bus home.

Much more mystifying...after ALL power was off, engine off, key
out, battery off, etc. the AI dial was spinning. Yes, that's right,
spinning like a top. Fast. And it didn't seem to slow down, either.
I didn't time it, but it just sat there spinning for at least
5 minutes.

Perhaps I may be off on this, but if it seemed stable upside down, is it
possible that it was accurately upside down so that the erecting
mechanism was not able to get it the right way up? I wonder if you had
resored vacuum after it started tumbling whether that would have enabled
it to precess to upright (which may take several minutes)?

Cheers Mark

Mark, et al.

Turns out (politics aside) that all of you were close. When the
next (#3) DG was installed, one of the hoses/tubes got pinched,
effectively hosing the AI. The unit itself is fine, and the repairs
have been completed and tested. Unfortunately, I won't be able
to check anything until Saturday due to anticipated horrendous
winds in Colorado.

Thanks all for the suggestions.