A steady Illumination of UP TRIM or DN TRIM
synchronization is not functioning and the autopilot
should not be engaged.
Turn knob Center
Elevator trim control switch ON
Control wheel Hold to mid travel.
AP button Press AP ENGAGE and YD
ENGAGE annunciators on autopilot
controller will Illuminate Servo clutches
The autopilot does a self test whenever
power Is applied to it. STBY light should
Illuminate within 10 seconds If it does not,
the system Is non-operative and can not be
used The elevator trim system must not be
forced beyond the limits which are indicated
on the elevator trim tab Indicator.
Elevator trim follow-up Check as
Control wheel Hold aft of mid
travel. Trim wheel should run nose
down after approx.