G1000/GFC 700 Post Installation Checkout Procedure – Hawker / Beechcraft King Air C90
Page 7-3
190-00682-00
Revision 5
10. Press the GO AROUND button on the left throttle. Verify ‘TO’ is annunciated on PFD1 and PFD2
for both PITCH and ROLL modes and the command bars should be at 8 degrees nose up and
wings-level.
11. Press the Flight Director (FD) key on the AFCS mode controller to deactivate the GA mode.
Press the AP key to engage the autopilot. Press the CWS button for a minimum of 5 seconds
and release; verifying there is no residual force on the control stick for the pitch axis.
12. Disengage the autopilot by pressing the AP/YD DISC TRIM INTRPT switch on the co-pilot’s
control wheel. Engage VS mode by pressing the VS key on the AFCS mode controller. Verify
PFD1 and PFD2 display ‘VS’ in green and indicates a pitch reference of ‘0 FPM’.
13. Press the FLC key on the AFCS mode controller and verify that ‘FLC’ is annunciated on PFD1
and PFD2 in green with a reference of 100 KTS.
14. Press the ALT key on the AFCS mode controller and verify that the ‘ALT’ annunciation is
displayed in green on PFD1 and PFD2 with an altitude reference equal to the aircraft altitude
(within the nearest 20 feet).
15. Press the FD key and verify that the mode annunciations and command bars are removed from
the display.
7.3
Autopilot Clutch Overpower Check
The GFC 700 uses electronic torque limiting as well as mechanical slip clutches to limit
the maximum servo effort. When the system is on the ground, the electronic torque
limiting is removed, allowing manual checks of the slip-clutch settings.
1. Engage the Autopilot by pressing the AP key on the AFCS mode controller.
2. Manually overpower the autopilot clutches in pitch and roll. If the Autopilot clutches cannot be
overpowered, check the servo clutch torque settings. Refer to the pitch or roll servo installation
drawing as applicable.
3. Actuate and hold PITCH TRIM switch in either the NOSE UP or NOSE DOWN direction to
disconnect the autopilot. While the trim is running, restrain the aircraft pitch trim wheel and verify
that the trim clutch can be overpowered. If it cannot be overpowered, check the trim servo clutch
torque setting. Refer to the pitch trim servo installation drawing.
4. Engage the autopilot by pressing the AP key on the AFCS mode controller. Actuate and hold the
manual electric trim switch in either the up or down direction to disconnect the autopilot. Verify
that the trim wheel moves smoothly in both directions throughout the entire trim range during
manual electric trim operation. If the trim wheel hesitates, this may indicate that the pitch trim
clutch is slipping and proper clutch setting and cable tension should be verified. Refer to the
System Maintenance Manual. If both clutch setting and cable tension are within tolerance, check
the aircraft pitch trim system for excessive friction. Refer to the appropriate Hawker Beechcraft
C90 Maintenance Manual.
7.4
Manual Electric Pitch Trim Speed Check
1. Run MANUAL ELECTRIC PITCH TRIM in one direction until it runs against the mechanical stop.
2. Run the trim in the opposite direction, and using a stop watch or equivalent device, time the trim
speed to the opposite mechanical stop. Verify the elapsed time for full travel measures 15
±
5
seconds.
7.5
Autopilot Operation Checks
1. Engage the Autopilot by pressing the AP key on the AFCS mode controller. Push the HDG knob
to synchronize the heading bug to the current aircraft heading. Select HDG mode by pressing the
HDG key on the AFCS mode controller. Verify the command bars are level and the control wheel
is stationary. (There may be some roll motion in the yoke if the aircraft not perfectly level.)
NOTE
