WHEN A TRANSMISSION IS SUSPECTED OF EXCESSIVE OIL LEAKAGE:
Perform an oil leak tolerance check (Task 6-109).
UPON REACHING 25 HOURS FOLLOWING INSTALLATION OF A FORWARD, AFT, OR COMBINING
TRANSMISSION OR AN AFT ROTARY WING DRIVE SHAFT:
Retorque (back off and retighten) mount nuts to specified torque (Tasks 6-51,
6-62, 6-77 and 6-97).
PRIOR TO INSTALLATION OF A REPLACEMENT ROTARY WING BLADE:
Insure letter E or F appear on identification plate.
WHEN A ROTARY WING BLADE HAS MADE CONTACT WITH A FOREIGN OBJECT OR WHEN THE
POWER TRAIN HAS BEEN SUBJECTED TO A SUDDEN REDUCTION IN RPM:
a. Inspect all six rotary wing blades as follows:
(1) Blade leading edge for dents, buckles, tears, and unbonding.
(2) Blade upper and lower surfaces for dents, delaminations, buckles,
wrinkles, and tears.
(3) Blade spar roots for distortion and delamination.
(4) Blade trailing edges for cracks, delaminations, and distortion.
(5) Tip cover and rib closure for damage. Remove tip cover and inspect
visible portion of blade interior for damage. check tip weight hardware
for security and damage.
(6) Shock absorber attachment brackets and filament windings for
cracks, delaminations, and distortion.
b. Inspect blade shock absorber for leakage, distortion, cracks (giving particular
attention to threaded area of rod end), and unrestricted travel. Shock absorber
attachment brackets on rotary wing head for cracks, distortion, and elongated
c. If inspection of blades and shock absorbers reveals damage or if a sudden
RPM reduction in the power train occurs, inspect the following:
(1) Aft rotor shaft center (aluminum) section and all power train drive
shafting for buckling. If buckling is detected, remove all power train
transmission and drive shafting.
(2) If there is no buckling, proceed to step (4).
(3) If buckling is found and power train components have been removed,
proceed to step (7).
(4) Power train shafting, adapters, and plate assemblies for cracks and
security of attachment.
(5) Bearing housing shock mounts for freedom of fore-and-aft movement
on support bushings, torn or unbonded rubber, and security.
(6) Drive system for freedom of rotation.
(7) Transmission and drive shafting supports for distortion, cracks, and
security. Adjacent structure for damage.