TB 1-1520-240-20-152
b. Maintenance Trainers (Category A and B) comply with message requirements no later than 6 August
2004.
Technical Procedures/Instructions..
NOTE
Do not lubricate the swashplate prior to performing the visual inspection
of the swashplate bearing.
NOTE
Lubrication and visual inspections will remain on the same schedule as
determined by CH-47-03-01.
a. Visual 100 (CH-47D/F)/ 150 (all MH-47 aircraft) hour recurring inspection (the following visual in-
spection remains the same as required in accordance with CH-47-03-01).
NOTE
This inspection can be performed on or off aircraft.
CAUTION
It is imperative that the Rotor Head be locked out prior to
performing the bearing inspection or damage to components will
occur.
(1) Lock out the Rotor Heads: H--47D/F per TM 55--1520--240--23; Task 11--28, Install Servocy-
linder Safety Blocks and Task 5--97, Remove Pitch Link (Pitch Link Lockpins installed). MH--47E per TM
1--1520--252--23; Task 11--33, Install Servocylinder Safety Blocks and Task 5--145, Remove Pitch Link (Pitch
Link Lockpins Installed).
NOTE
Prior to removing hardware, thoroughly wipe clean all upper seal
surfaces (only), by hand with a lint free cloth. Remove only the Upper
Seal, P/N 114R3428--1. Do not remove the Upper Bearing Retainer, P/N
114R3126--4. Only 12 bolts and washers (Aft) or nuts and washers (Fwd)
need to be removed.
(2) Remove Forward and Aft Swashplate Upper Seal, P/N 114R3428--1, per TM
55--1520--240--23, Task 5--122, paragraphs 1a and 2a (H--47D/F) or TM 1--1520--252--23, Task 5--175, para-
graphs 1a and 2a (MH--47E).
WARNING
If this inspection is performed on aircraft, ensure no FOD enters
the bearing. Do not attempt to clean or wipe the bearing prior to
performing the next step.
(3) Use a flashlight or other suitable light source to visually inspect for raised, overlapping or bro-
ken cage segments. Inspect for orange/red pieces of debris. The lower grease seal is elastomeric orange/red
in color: therefore this type of rubber debris may be indicative of damage to this lower seal.
WARNING
Do not use cloths or rags to clean the bearing area, as this may
snag or catch on the bearing cage and disturb the balls.
(4) Wipe away excess grease in cavity using fingers. Use a flashlight or other suitable light source
to visually inspect for raised, overlapping or broken cage segments or multiple adjacent uncaged ball bear-
ings. Inspect for orange/red pieces of rubber debris.
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