Figure 9-6.–Stabilizer control system.
The horizontal stabilizer control system shown in
figure 9-6 is representative of the systems used in
many present-day aircraft. The slab-type stabilizer
responds to fore-and-aft manual input at the control
stick. It responds to automatic flight control system
electrical signals introduced at the stabilizer actuator.
In the “clean” configuration, with flaps and slats
retracted, stabilizer travel is from 1 1/2 degrees of
leading edge up to 10 degrees of leading edge down.
In the “dirty” configuration, with flaps and slats
extended, stabilizer travel is increased to 24 degrees
of leading edge down to provide greater control at
slower airspeeds.
Pilot signals are conveyed through bell cranks and
pushrods and a trim mechanism to the input linkage of
the stabilizer actuator. A trim switch on the control
stick grip provides a means of setting stabilizer trim.
Stabilizer trim is displayed by the stabilizer trim
indicator located on the pilot’s lower instrument
panel. See figure 9-7.
9-6
