Manualshelf

System Maintenance Manual

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G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 4-23
190-00682-01 Revision F
IMPORTANT!
If the test must be stopped, firmly grasp the aircraft control being moved and press
the red AP DISC switch on the aircraft control stick. If an abnormal disconnect of a
servo occurs, reset AFCS SERVO circuit breaker and repeat the step.
8. Manually select +2.50 rpm for the Drive Servo and press ENT.
9. Press the ENG CLCH softkey.
10. Press the DRV SRVO softkey.
11. Allow the selected servo to drive the control surface to either the NOSE DOWN stop (Pitch and Pitch
Trim) or the LEFT stop (Roll and Yaw).
12. During operation of the servo, observe the CURRENT field and verify that the current displayed
varies during operation
13. Allow the servo to continue driving against the control stop for at least 50 seconds. Observe the
TORQUE values displayed in the Servo Data field and record the maximum and minimum values in
Table 4-10 or in the appropriate aircraft maintenance records.
14. Manually select 0.00 rpm for the Drive Servo and press ENT. Allow the servo to stop.
15. Manually select -2.50 for the Drive Servo and press ENT. Allow the selected servo to drive the
control surface to either the NOSE UP stop (Pitch and Pitch Trim) or the RIGHT stop (Roll and
Yaw). If the PITCH SERVO is selected, firmly hold the control yoke in the full aft position until the
NOSE UP portion of the test is completed.
16. Allow the servo to continue driving against the control stop for at least 50 seconds. Observe the
TORQUE values displayed in the Servo Data field and record the maximum and minimum values in
Table 4-10 or in the appropriate aircraft maintenance records.
17. Manually select 0.00 rpm for the Drive Servo and press ENT. Allow the servo to stop.
18. Firmly grasp the aircraft control under test and press the DIS CLCH softkey.
19. Press the STP SRVO softkey.
20. Repeat steps 2 through 18 for each servo axis shown.
21. Verify that the minimum and maximum torque values measured are within the Minimum and
Maximum torque values allowed, for the given axis, listed in Table 4-10.