Garmin SA01456Wi_D Manual download pdf (Page 297)

G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 8-11

190-00682-01 Revision F

8.2.2 AFCS Switch Checks

Verify that the AFCS system buttons and switches are operating correctly by performing the following:

1. Actuate both sections of the PITCH TRIM (NOSE UP/NOSE DN) switch to activate Manual

Electric Pitch Trim (MEPT). Verify the trim clutch engages and the trim wheel drives in the

requested direction. Check operation in both the up and down direction.

2. Press the AP/YD DISC TRIM INTRPT switch and hold while actuating the manual electric trim

switch. Verify trim does not run and the trim wheel rotates freely when moved manually.

Release the AP/YD DISC TRIM INTRPT button and PITCH TRIM switch.

3. Engage the autopilot by pressing the AP key on AFCS mode controller. Press and hold the left

section of the manual electric trim switch. Verify the Autopilot disengages normally with an

aural alert and the trim wheel rotates freely when moved manually.

4. Engage the autopilot again by pressing the AP key on the AFCS mode controller. Verify the

pitch and roll clutches engage and resist movement of the control wheel. Press and hold the CWS

switch and verify the control wheel moves freely when moved manually. Verify the green ‘AP’

at the top of PFD1 and PFD2 is replaced by a white ‘CWS’.

5. Release the CWS switch and press the ‘XFR’ key on the AFCS mode controller. Verify the

clutches are engaged and resist movement of the control wheel. Press and hold the CWS switch

and verify the control wheel moves freely when moved manually. Verify the green ‘AP’ at the

top of PFD1 and PFD2 is replaced by a white ‘CWS’.

6. Release the CWS switch and press the AP/YD DISC TRIM INTRPT switch on the pilots control

wheel. Verify the autopilot disengages with a flashing amber ‘AP’ annunciation on PFD1 and

PFD2, accompanied by an aural alert. Verify that the control wheel is free in pitch and roll axes.

7. Engage the autopilot again by pressing the ‘AP’ key on the AFCS mode controller. Open AFCS

SERVOS circuit breaker. Verify the autopilot disconnects and the abnormal disconnect is

provided, consisting of a continuous aural alert and a flashing red/white ‘AP’ annunciation.

Verify no AFCS annunciations (e.g. AFCS, PFT, Mistrim) remain on PFD1 or PFD2. Press the

AP/YD DISC TRIM INTRPT switch to cancel the abnormal alert. Close the AFCS SERVOS

circuit breaker to restore power to the system and wait for completion of the pre-flight test

sequence.

8. Engage the autopilot again by pressing the ‘AP’ key on the AFCS mode controller. Ensure the

autopilot is coupled to GIA1 by verifying the arrowhead next to the ‘XFR’ key on the AFCS

mode controller is pointing to the pilot’s side. If the arrowhead points to the copilot’s side, press

the ‘XFR’ key. Open GIA1 primary and secondary circuit breakers. Verify the autopilot

disconnects with a continuous aural alert and a flashing red/white ‘AP’ annunciation. Press the

AP/YD DISC TRIM INTRPT switch to cancel the alert and annunciation. Close the GIA1

primary and secondary circuit breakers and wait for completion of the pre-flight test sequence.

9. Press the ‘XFR’ key on the AFCS mode controller and engage the autopilot by pressing the ‘AP’

key on the AFCS Mode Controller. Press the AP/YD DISC TRIM INTRPT switch on the pilot

side to disconnect the autopilot; verify the flashing amber ‘AP’ alert is displayed on PFD1 & 2.

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’.

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Garmin SA01456Wi_D Manual Page 297

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Garmin SA01456Wi_D Manual Page 297

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