System Maintenance Manual

Page 4-24 G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air
Revision G 190-00682-01
Axis Direction
Min Measured
Torque (in-lbs)
Max Measured
Torque (in-lbs)
Min Allowed
Torque (in-lbs)
Max Allowed
Torque (in-lbs)
Pitch
Up
76 105
Down
Roll
Left
63 87
Right
Yaw
Left
56 99
Right
Pitch
Trim
Up
39 53
Down
Table 4-10. Measured Torque
NOTE
If the measured values exceed the limits in Table 4-10, the servo must be removed from the aircraft and
tested/adjusted per the
Servo Adjustment Fixture Procedure in Section 4.9.3.
4.9.2.1 Abnormal Test Prompts
During the testing, the following prompts may be displayed indicating an abnormality encountered during
the test. Use the following guidelines to troubleshoot.
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 likely
cause.
Repeat test.
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. Likely causes include a high
slip clutch setting, or excess friction
encountered during the control
surface travel.
Engage the autopilot for the axis
which reported torque to 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.
Check control friction against aircraft
maintenance specifications.
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
Repeat test again. If the same result
is received, remove servo mount and
check/set clutch on stand.