In article , Jay Moreland
wrote:

I need to find out if there is an official maximum amount of precession
for a Directional Gyro. My aircraft precesses 10 degrees in 10 minutes
during mostly straight and level flight with only a few shallow banks.

One avionics tech told me that it depends on the gyro manufacturer as to
what is acceptable. He also told me that an out of the box unit tested
on the table should not precess more than ONE degree in four minutes.

Jay Moreland


I've heard 3 degrees/ 15 minutes as the max. One degree per minute is
certainly
too much.

An airplane I used to fly had a lousy old DG in it...it precessed at a rate
that
if you maintained the heading on the DG you were in about a 1/2 standard rate
turn. G

I've heard the same. IIRC, the max was actually 10 degrees per hour. 3
degrees in 15 minutes was the short timer check.

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