The control wheel must be held at mid-travel
due to ballast in the elevator. The autopilot
will disconnect during pitch wheel check due
to the heavy nose down force if the control
wheel is not off the forward stop.
Control wheel - Move to mid-travel.
(autopilot controller) - Depress to
engage autopilot and yaw damper.
Check that AP ENGAGE and YD
annunciators on instrument panel
Autopilot overpower check - Check as
Rudder pedals - Overpower slowly.
Control wheel - Overpower slowly in
If the autopilot or yaw damper disengages
during the overpower test, the system is
considered non-operative and should not be
used. The elevator trim system must not be
forced beyond the limits which are indicated
on the elevator trim indicator.
Elevator trim follow-up - Check as
Control wheel - Move aft of mid-
travel. Trim wheel should run nose
seconds. TRIM DN annunciator
illuminate after approximately 6 to 8
seconds, and AP TRIM annunciator
(instrument panel) should illuminate
after approximately 15 seconds.
Cont rol wheel - Move forward of
mid-travel. Trim wheel should run
seconds. TRIM UP annunciator
illuminated after approximately 6 to
8 seconds. AP TRIM annunciators
illuminated after approximately 15
AP & YD/TRIM DISC switch (control
wheel) - Depress to first level. Check
annunciators above the EADI's flash 5
Control wheel - Hold to mid-travel.
AP ENGAGE switch - Re-engage.
Turn knob - Check that elevator control
trim wheel follows in each applied
direction, then center.
10. Pitch wheel - Check that trim responds
to pitch wheel movements. (UP TRIM
11. Heading marker - Center and engage
HDG. Check that control wheel follows
a turn in each direction.
12. GO AROUND button (left power lever) -
Depress. Check that AP disengages
and FD commands a wings level, 7
degrees nose up attitude. Check GA
annunciator on EADI illuminates. Yaw
damper should automatically engage
and YD ENGAGE switch-annunciator
should be illuminated on the autopilot
controller and the remote annunciators
above the EADI's should be illuminated.
TEST switch (pedestal extension) -
TEST. Check the RUDDER BOOST
illuminates, yaw damper disengages,
YD ENGAGE switch-indicator on the
autopilot controller extinguishes, and the
above the EADI's flash 5 times.
If the SBY annunciator on the flight director
mode selector does not illuminate within 10
seconds after the avionics master switch is
turned on, the autopilot has failed self-test
and is considered inoperative and should not
Do not force the elevator trim system beyond
the limits which are indicated on the
ELEVATOR trim tab indicator.
indicator (autopilot controller) - Depress
while holding rudder boost/yaw control
test switch in TEST. Yaw damper
should not engage.