TM 55-1510-221-CL
20.
Heading bug - Center and engage HDG. Check that control follows a turn in each direction.
21.
Disengage AP by selecting GA. Check that AP disengages and FD commands 7 nose up, wings level attitude
YD disengage, mode selector push standby.
22.
Elevator trim switch - ON.
23.
Pilot and Copilot trim switches - Check operation.
WARNING
Operation of the electric trim system should occur only by movement of pairs of switches.
Any movement of the elevator trim wheel while depressing 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.
24.
Pilot and Copilot. Check individual element for no movement of trim, then check proper operation of both
elements.
25.
Check Pilot switches override Copilot switches while trimming in opposite directions, and trim moves in direction
commanded by Pilot.
26.
Check Pilot and Copilot trim disconnects while activating trim.
27.
Elevator trim switch - OFF then ON (ELECT TRIM OFF annunciator extinguishes).
PROPELLER MANUAL FEATHERING
1.
Condition lever- LOW IDLE.
2.
Left propeller lever - FEATHER. Check that propeller feathers.
3.
Left propeller lever - HIGH RPM.
4.
Repeat procedure for right propeller.
C2 P-7
