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Posted for "Clark Baker" <clarkbaker@rcn.com>:

I recently installed thin (about 1/16") plastic spacers between the UMA
light wedges and my Two RC Allen electric attitude gyros.  I have an
all-electric dual bus system.  This was my Lancair's first flight after
being down 5 months for modifications and paint.  Both gyros appeared
fine during pre-start, taxi, takeoff, climb, and a shallow banking turn.
However, as soon as I exceeded about 25-30 degrees of bank, BOTH gyros
tumbled.

Somewhat confused, I sent both gyros out to be bench tested - both
tested fine.  When I reinstalled the two gyros, I noticed the new
plastic spacers did not have quite enough clearance in the cutouts,
preventing the caging knob from FULLY retracting.  Once I fixed this
clearance problem (allowing the caging knobs to fully retract), the
gyros worked perfectly.

Cost of my lesson - $250 for bench tests.  Potential cost of my lesson
had it been actual IFR? -  a lot more.

Regards,
Clark Baker

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