TM 1-1520-240-MTF
4-12
NOTE
To do a satisfactory looseness check, all binding
conditions within control system must be correc-
ted. Binding in some components will prevent
detection of looseness in other components. Also,
looseness (or wear) in some components can
cause binding.
1. Check for binding in the tunnel controls as
follows:
CAUTION
Dirt on the bellcranks and idlers can sift into
the bearings. Dirty bearings will bind and
cause jerky control movements.
a. Open the forward fairings and work
platforms. Open the six tunnel covers.
b. Apply ac and hydraulic boost pressure to the
flight control system.
c. Move the thrust control, cyclic stick, and
directional pedals to produce motion in the
tunnel controls.
NOTE
Thrust or pitch control input will move the idlers.
Roll or directional control input will move the walk-
ing beams.
(1) Observe the walking beams and idlers.
Check for jerking movements. Observe
components attacking bolts. Check for
jerky rotation.
