Instruction Manual

Page 4-22 G1000 / GFC 700 System Maintenance Manual - 200/B200 Series King Air
Revision 9 190-00915-01
4.9 GSM 85A/GSM 86 Slip Clutch Torque Check Procedure
Perform the test per section 4.9.1, 4.9.2 or 4.9.3. The following test procedures are the same for both the
GSM 85A and the GSM 86 servo gearboxes.
4.9.1 Automated Slip Clutch Test Procedure (SW version 0985.04 and later)
1. Before starting test, select the AVIONICS MASTER PWR and BATT switches to OFF.
2. Press and hold the ENT key on PFD1 while applying aircraft EXT power and selecting the
AVIONICS MASTER PWR and BATT switches to ON.
3. Release the ENT key after ‘INITIALIZING SYSTEM’ appears in the upper left corner of PFD1.
(Steps 1 through 3 put PFD1 in Configuration Mode and PFD2 / MFD in normal mode.)
4. Verify the correct type of servo gearbox is configured for each servo per Section 3.37.
5. With the MFD in Normal Mode, press the red DISPLAY BACKUP button on the pilot’s GMA
audio panel to place the MFD in reversion mode.
6. With PFD1 in Configuration Mode, go to the GFC Page Group and select the GFC STATUS page
using the FMS knobs.
Figure 4-3, GFC Status Page
IMPORTANT!
It is highly recommended that the following test be performed at temperatures
between 50° F and 120° F.
7. Use the FMS knob to select the desired servo (Pitch, Roll, Yaw or Pitch Trim).
8. Verify that the PFT status field shows PASSED.
9. Verify that the aircraft control surface to be checked is free to travel throughout its range of motion.
10. Press the TEST SVO softkey on the PFD. Follow prompts to begin the test.
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 wheel. If an abnormal disconnect of
a servo occurs, reset the AFCS SERVO circuit breaker and repeat the test.
11. When test is completed, verify the CLUTCH TEST PASS message is displayed on the MFD.
12. Repeat steps 4 through 8 for each servo axis (Pitch, Roll, Yaw and Pitch Trim).