Instruction Manual

Page 4-22 G1000 / GFC 700 System Maintenance Manual - 200/B200 Series King Air
Revision 8 190-00915-01
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. 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.
13. Manually select 0.00 rpm for the Drive Servo and press ENT. Allow the servo to stop.
14. 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.
15. 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.
16. Manually select 0.00 rpm for the Drive Servo and press ENT. Allow the servo to stop.
17. Firmly grasp the aircraft control under test and press the DIS CLCH softkey.
18. Press the STP SRVO softkey.
19. Repeat steps 2 through 18 for each servo axis shown.
20. 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.
Axis Direction
Min Measured
Torque (in-lbs)
Max Measured
Torque (in-lbs)
Min Allowed
Torque (in-lbs)
Max Allowed
Torque (in-lbs)
Pitch
Up
28 (GSM 85A)
24 (GSM 86)
38 (GSM 85A)
40 (GSM 86)
Down
Roll
Left
116 (GSM 85A)
99 (GSM 86)
161 (GSM 85A)
168 (GSM 86)
Right
Yaw
Left
78 (GSM 85A)
66 (GSM 86)
107 (GSM 85A)
112 (GSM 86)
Right
Pitch
Trim
Up
52 (GSM 85A)
45 (GSM 86)
71 (GSM 85A)
76 (GSM 86)
Down
Table 4-10, Measured Torque
NOTE
If the GSM 85A or GSM 86 measured values exceed the limits in Table 4-10, the servo
gearbox must be removed from the aircraft and tested/adjusted per the Servo Gearbox
Adjustment Fixture Procedure in Section 4.9.3.