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G1000 System Maintenance Manual
Page 7-17
190-00903-00
Rev.
A
a.
Excessive flexibility of GRS77 and/or GMU44 mechanical mounting with respect to
airframe.
b.
Vibrational motion of GRS77 and/or GMU44 caused by neighboring equipment
and/or supports.
c.
Mounting of GRS77 at a location that is subject to severe vibrations (for example,
close to an engine mount.)
d.
Mounting screws and other hardware for GRS77 and/or GMU44 not firmly attached.
e.
Absence of mounting supports recommended by the aircraft manufacturer.
f.
GRS77 connector not firmly attached to unit.
g.
Cabling leading to GRS77 or GMU44 not firmly secured to supporting structure.
h.
An engine / propeller that is significantly out of balance.
In some aircraft, attempting the engine run-up test on a day with very strong and/or gusty winds
may cause the test to occasionally fail. However, windy conditions should not be taken as
evidence that the test would pass in calm conditions; an actual pass is required before the
installation can be considered adequate.
1.
Press the ENT key on the PFD.
2.
Repeat steps 1 through 6 for GRS 77 #2.
With the G1000 in normal mode, the aircraft can now be taxied back and the engine can be shut
down for final testing. When the PFD powers up in normal mode, the AHRS attitude and
heading information displayed should become valid within 1 minute of power-up.
