TB 1-1520-240-20-152
NOTE
The design of the bearing allows for up to 3 individual cage segments
with each segment separated by one uncaged ball.
(5) If any of these conditions are found, except for those in the note above, the Swashplate As-
sembly shall be considered unserviceable. Dispose of in accordance with paragraph 11d of this message.
NOTE
If replacement self--locking nuts are not available, re--use of the original
nuts is authorized provided they meet the following torque requirement.
The torque required to start the nut rotating with a minimum of one full
thread extending from the end of the nut shall be at least 7 inch--pounds.
The standard procedure of using new nuts at each removal and
reinstallation shall be followed as soon as new nuts are available.
(6) If the bearing passes in accordance with paragraphs 3 and 4, install the Swashplate Upper
Seal, P/N 114R3428--1, per TM 55--1520--240--23, Task 5--125, Paragraphs 7b and 8e--h (H--47D/F) or TM
1--1520--252--23, Task 5--179, Paragraphs 7b and 8e--h (MH--47E). If nuts were reused on forward swash-
plate, apply a torque stripe to all nuts for visual inspection reference. A recurring entry for a Daily Inspection
will be required on DA Form 2408-13-1 until new nuts are installed.
(7) Unlock Rotor Heads; H--47D/F per TM 55--1520--240--23; Task 5--99, Install Pitch Links (re-
move Pitch Link Lockpins) and Task 11--29, Remove Servocylinder Safety Blocks. MH--47E per TM
1--1520--252--23; Task 5--148, Install Pitch Links (remove Pitch Link Lockpins) and Task 11--34, Remove Ser-
vocylinder Safety Blocks.
CAUTION
For the purpose of this Safety of Flight only, a test flight to track
the rotor blades is not required as long as no adjustments were
made to the Pitch Links and the Pitch Links are installed back in
their original location.
b. 50 hour recurring lubrication/purge and 50 hour recurring grease inspection.
(1) Using a soft, clean, lint--free cloth, dampened with cleaning solvent (MIL--PRF--680) --
(a) Clean the inner and and outer dust cover. Ensure all surface grit, sand, and other foreign
material is removed. This will ensure that no FOD is included in the grease sample and that only recently
used grease will be included in the sample.
(b) Wipe dirt and grease from lubrication fitting to ensure that no foreign material is
(2) Grease inspection procedure.
CAUTION
Pumping grease into swashplate without turning/rotating ring can
result in bearing damage.
NOTE
If you cannot pump grease and rotate the swashplate at the same time,
rotate swashplate in 12 equal steps, 30 degrees each step. Pump in
grease between steps.
NOTE
Proper purging of the bearing requires at least 16 ounces of new grease.
(a) Have helper rotate ring by pulling blades around with tie down line. As ring rotates, use
a hand lubricating grease gun with a flexible hose to pump grease into fitting. Rotate the ring through at
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