TM 1-1510-218-10
9-19/(9-20 blank)
12. Emergency lights – As required.
9-35. FLIGHT CONTROLS MALFUNCTION.
Use the following procedures, as applicable, for
flight control malfunctions.
a. Unscheduled Rudder Boost Activation.
Rudder boost operation without a large variation of
power between engines indicates a failure of the
system.
1. RUDDER BOOST – OFF.
NOTE
The rudder boost system may not operate
when the brake deice system is in use.
Availability of the rudder boost system will
be restored to normal when the BRAKE
DEICE switch is set to OFF.
IF CONDITION PERSISTS:
2. RUDDER BOOST circuit breaker – Pull.
3. BLEED AIR VALVE – OFF (Below
10,000 feet).
4. Rudder trim – Adjust.
b. Unscheduled Electric Elevator Trim. In the
event of unscheduled electric elevator trim, perform
the following procedure.
1. Control
wheel
disconnect
switch
–
Depress.
2. ELEV TRIM switch – OFF.
3. ELEC TRIM circuit breaker – OUT.
c. Electric Elevator Trim Controls Frozen in
Flight. Moisture entering or condensing in the
elevator trim control clutch assembly can freeze in
flight locking the trim in a cruise position. This
condition is first noticed when preparing for descent or
retrimming at altitude. Flight in above freezing
temperatures will normally clear the problem before
landing, however if the elevator control is still frozen
during the approach, control forces must be overcome
manually. Descend using power reduction to keep
heavy control forces caused by airspeed increases to
a minimum. If trim control freedom has not been
attained prior to landing, consider a no flaps approach
and landing to ease control back pressure.
