TM 1-1520-238-23
Change 6
11-993
11.232.
DIRECTIONAL CONTROL SYSTEM INSPECTION – continued
(2) Due to the close tolerance buildup of this bearing, coupled with the grease viscosity (temperature depen-
dant), the initial roughness, ratchety feeling, and binding may not entirely diminish with subsequent
rotations. This is not cause for rejection.
(3) Obvious severe ratcheting, or binding and/or a metallic grinding is cause for rejection of the swashplate
(para 11.262).
c. Install tail rotor de-ice brush block in tail rotor swashplate (para 11.262).
11.232.6. -15, -17, -19, and -901 Swashplate Inspection (10 Hour/14 Day Inspection Criteria)
a. Check swashplate for smooth, quiet bearing rotation. (This inspection requires no disassembly.)
(1) Visually check outboard swashplate bearing seal for deterioration, contamination, or metal fragments.
(a) If seal is damaged or missing and/or metal fragments are present, replace swashplate assembly (para
11.262).
(2) Using hydraulic accumulator pressure, move the pedals slowly full right, then full left to verify that the
swashplate moves smoothly along the gearbox static mast. (Requires two people – one to cycle the
controls and an observer).
(a) Leave pedals in the full left position.
(3) Check the swashplate bearing for smoothness of operation, without binding, ratcheting, or chattering
during full travel.
(4) Small amount of grease expelling from the swashplate and wetness appearing on the outside surface of
the seal are normal.
(5) Seal surface requires small amount of grease/oil to lubricate itself and prevent dryness and excessive heat
generation.
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