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G1000 System Maintenance Manual
Page 9-9
190-00903-00
Rev.
A
9.8.1 Abnormal Test Message Prompts
The following prompts may be displayed indicating an abnormality encountered during testing.
Use the following guidelines to troubleshoot the problem.
Message Prompt
Probable Cause
Action
STOP NOT REACHED
The servo did not detect a torque
value which exceeded 70% of
the established mechanical
torque limit within 1 minute of
starting the test. A low slip clutch
setting is the probable cause.
a.
Repeat
test.
b.
If the same result is
received, remove servo
mount and check/set clutch
on stand.
SERVO TORQUE TOO HIGH
The servo detected an average
torque value which exceeded
130% of the established
mechanical torque limit.
Probable causes include a high
slip clutch setting, or excess
friction encountered during the
control surface travel.
a.
Engage the autopilot for the
axis which reported torque
too high. Manually operate
the controls and verify that
the clutch can be
overridden. If the clutch
can slip, repeat the test
again. Otherwise remove
the servo mount and reset
the clutch.
b.
Check control friction
against aircraft
maintenance specifications.
c.
If the same result is
received on retest, remove
servo mount and check/set
clutch on stand.
SERVO TORQUE TOO LOW
The servo detected an average
torque value which fell below
70% of the established
mechanical torque limit after
detecting that the stop was
reached.
Likely causes include a low slip
clutch setting or a disturbance in
the controls before reaching the
stop.
Repeat test again. If the same
result is received, remove servo
mount and check/set clutch on
stand.
INVALID SERVO SPEED
The servo is unable to maintain
the required ~2.5 RPM during the
test (Speed drops below 2 RPM
or exceeds 3 RPM)
a.
Repeat test again.
b.
If the same result is
received, remove servo
mount and check/set clutch
on stand.
