9. Anti-ice/deice systems Check.
a. PROP deice Check. When MANUAL
mode is selected, note rise on DC
loadmeter. When AUTO mode is selected,
monitor prop ammeter for 90 seconds and
ensure the indicator remains in the normal
operating range the entire time.
b. WSHLD ANTI-ICE Check. Note
increases on the loadmeter and cycle
through both normal and high settings.
If windshield heat is needed prior to
takeoff, use NORMAL setting for a
minimum of 15 minutes prior to selecting
HIGH to provide adequate preheating and
minimize the effects of thermal shock. The
windshield heat thermostat will invalidate
the check in OAT above 20 to 30
c. All anti-ice/deice switches OFF.
d. Surface deice system Check.
10. Vacuum and pneumatic system Check.
a. LEFT BLEED AIR VALVE OFF.
(2) L BL AIR OFF annunciator illuminates.
(3) Both BL AIR FAIL annunciators remain
b. RIGHT BLEED AIR VALVE OFF.
(1) Pneumatic and suction pressures read
(2) Both BL AIR OFF and BL AIR FAIL
c. LEFT BLEED AIR VALVE ON.
return to normal.
BL AIR FAIL annunciators
d. RIGHT BLEED AIR VALVE ON.
11. Automatic flight control system Check.
a. Autopilot controller TRIM UP, TRIM DN
Annunciators Check not illuminated. A
steady illumination of TRIM UP or TRIM
DN annunciator indicates that automatic
synchronization is not functioning and
autopilot should not be engaged.
b. Turn knob In center detent position.
c. Elevator trim control switch ON.
d. Control wheel To mid travel.
e. Autopilot controller AP button Press. AP
ENGAGE and YD ENGAGE annunciators
on autopilot controller will flash. Servo
clutches will engage. FD flag on ADI in
f. Control movement Check when pushed
If autopilot or yaw damper disengages
during overpower test, do not use. If AP
ENGAGE or YD ENGAGE annunciator
continues to flash, do not use.
g. Rudder pedals Overpower slowly. YD
ENGAGE annunciator stops flashing. FD
h. Elevator trim follow-up Check.
i. Control wheel Hold aft of mid travel. Trim
wheel should run nose down after
approximately 3 seconds. Trim down
approximately 8 seconds.
j. Control wheel Hold forward of mid travel.
Trim wheel should run nose up after
approximately 3 seconds. TRIM UP
approximately 8 seconds, and AP TRIM
FAIL annunciator and MASTER WARNING
approximately 15 seconds.
k. AP/YD & TRIM DISC button Press
through second level. Autopilot and yaw
damper should disengage and ELECT
TRIM OFF annunciator should illuminate.
annunciators on instrument panel should
flash five times and autopilot off aural alert
should sound for 1 second.
l. MASTER WARNING flasher Press to