Beechcraft C-12C Operator And Technical Reference Manual page 841

(b) Control wheel – Overpower slowly
in both pitch and roll axis.
ENGAGE
flashing. FD flag on ADI retracts.
WARNING
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.
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.
nose down after approximately
3 seconds.
annunciator should illuminate after
approximately 8 seconds.
(b) Control wheel – Hold forward of
mid travel. Trim wheel should run
nose
3 seconds, trim up annunciator
should
approximately 8 seconds, and AP
TRIM
MASTER WARNING lights should
illuminate
15 seconds.
(8) AP/YD & TRIM DISC Button – Press
through second level. Autopilot and
yaw damper should disengage and
ELEC TRIM OFF annunciator should
illuminate.
annunciators on instrument panel
should flash five times.
(9) Elevator trim control switch – OFF,
then on.
annunciator should extinguish.
(10) AP – Re-engage and overpower
another time.
(11) Turn controller – Check that control
wheel follows
direction, then center.
(12) Pitch wheel – Check that trim
responds to pitch wheel movement.
UP TRIM and DN TRIM annunciators
may illuminate.
annunciator stops
The
Trim wheel should run
Trim down
up after approximately
illuminate after
FAIL annunciator and
after approximately
AP ENG and YD ENG
ELEC TRIM OFF
in each applied
(13) Heading bug – Center and engage
AP
(14) Disengage AP by selecting GA.
10. Electric elevator trim
a. Elevator trim switch – On.
b. Pilot and copilot trim switches – Check
operation.
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 –
(2) Pilot trim switches – Check that pilot
c. Pilot and copilot trim switches.
trim disconnects while activating pilot's or
copilot's trim switches.
d. Elevator trim switch – OFF then ON.
ELEC
extinguishes.
11. Ground Proximity Altitude Advisory System
(GPAAS) – Check as follows:
The GPAAS voice advisory must produce
an operational volume at the lowest
setting.
a. GPAAS voice advisory VOL control –
Full counterclockwise.
b. VOICE
Extinguished.
c. Audio control panel – Set listening audio
level.
TM 1-1510-218-10
HDG. Check that control follows a
turn in each direction.
Check that AP disengages and FD
commands 7° nose up, wings level
attitude.
D2 – Check.
WARNING
Check individual element for no
movement of trim
operation of both elements.
trim switches override
switches while trimming in opposite
directions and trim moves in direction
commanded by pilot.
TRIM OFF
NOTE
OFF switch-indicator
and proper
copilot
Check
annunciator
–
8-15