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
1. RUDDER BOOST OFF.
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
4. Rudder trim Adjust.
b. Unscheduled Electric Elevator Trim. In the
event of unscheduled electric elevator trim, perform
the following procedure.
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.