TM 1-1520-240-MTF4-12NOTETo do a satisfactory looseness check, all bindingconditions within control system must be correc-ted. Binding in some components will preventdetection of looseness in other components. Also,looseness (or wear) in some components cancause binding.1. Check for binding in the tunnel controls asfollows:CAUTIONDirt on the bellcranks and idlers can sift intothe bearings. Dirty bearings will bind andcause jerky control movements.a. Open the forward fairings and workplatforms. Open the six tunnel covers.b. Apply ac and hydraulic boost pressure to theflight control system.c. Move the thrust control, cyclic stick, anddirectional pedals to produce motion in thetunnel controls.NOTEThrust 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. Observecomponents attacking bolts. Check forjerky rotation.
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