(b) Control wheel Overpower slowly
in both pitch and roll axis. AP
flashing. FD flag on ADI retracts.
If autopilot or yaw damper disengages
during overpower test or if AP ENGAGE or
YD ENGAGE annunciator continues to
flash, the system is considered non-
operative and should not be used. The
elevator trim system must not be forced
beyond the limits indicated on the elevator
trim tab indicator.
(7) Elevator trim follow-up Check.
(a) Control wheel Hold aft of mid
travel. Trim wheel should run
nose down after approximately
annunciator should illuminate after
approximately 8 seconds.
(b) Control wheel Hold forward of
mid travel. Trim wheel should run
3 seconds, trim up annunciator
approximately 8 seconds, and AP
MASTER WARNING lights should
(8) AP/YD & TRIM DISC Button Press
through second level. Autopilot and
yaw damper should disengage and
ELEC TRIM OFF annunciator should
illuminate. AP ENG and YD ENG
annunciators on instrument panel
should flash five times.
(9) Elevator trim control switch OFF,
annunciator should extinguish.
(10) AP Re-engage and overpower
(11) Turn controller Check that control
direction, then center.
(12) Pitch wheel Check that trim
responds to pitch wheel movement.
UP TRIM and DN TRIM annunciators
(13) Heading bug Center and engage
HDG. Check that control follows a
turn in each direction.
(14) Disengage AP by selecting GA.
Check that AP disengages and FD
commands 7° nose up, wings level
10. Electric elevator trim D2 Check.
a. Elevator trim switch On.
b. Pilot and copilot trim switches Check
Operation of the electric trim system
should occur only by movement of pairs of
switches. Any movement of the elevator
trim wheel while pressing only one switch
element denotes a system malfunction.
The electric elevator trim control switch
must then be turned OFF and flight
conducted by operating the elevator trim
wheel manually. Do not use autopilot.
(1) Pilot and copilot trim switches
Check individual element for no
operation of both elements.
(2) Pilot trim switches Check that pilot
switches while trimming in opposite
directions and trim moves in direction
commanded by pilot.
c. Pilot and copilot trim switches. Check
trim disconnects while activating pilot's or
copilot's trim switches.
d. Elevator trim switch OFF then ON.
11. Ground Proximity Altitude Advisory System
(GPAAS) Check as follows:
The GPAAS voice advisory must produce
an operational volume at the lowest
a. GPAAS voice advisory VOL control
c. Audio control panel Set listening audio