TB 1-1520-240-20-85
Remove blocks when the hydraulic power is supplied.
b. Overhauled upper boost actuators shall be replaced within the next 12 months with a new actuator or an
overhauled actuator that has been properly adjusted. The overhauled units that have been properly adjusted by depot will
be marked with a suffix "N" behind actuators serial number.
c, If the swashplate fails the friction check (Task 5-115 for the CH-47D/MH47D and Task 5-167 for the MH-47E)
follow correctional procedures provided in that task.
d. If swashplate fails the uniball friction check (Task 5-114 for the CH-47D/MH-47D and Task 5-165 for the
MH47E), reinspect using the following alternate criteria/procedure:
(1)
If reading is greater than 63.5 and less than 80 lbs, perform axial play inspection (Task 5-114.1 and Task
5-166 for E model). If play is within limits, swashplate friction is acceptable.
(2)
If reading is greater than 80 lbs, perform the axial play inspection, Task 5-114.1 and Task 5-166 for E
model.
(3)
If axial play is out of limits, correct per manual. If axial play is within limits, proceed with alternate friction
check as identified in steps 4 through 16.
(4)
Perform initial setup and steps 1 through 6 of Task 5-114 and Task 5-166 for E model.
(5)
Remove hydraulic and electrical power from the helicopter.
Do not apply hydraulic pressure to move actuating cylinders when personnel are making
swashplate friction check. Injury to personnel can result.
(6)
Remove cotter pin, nut, washer, and bolt from upper end of LCT actuator.
LCT end of stationary swashplate may tend to move downward with both bolts removed. Ensure
clearance with LCT actuator and link.
(7)
Remove cotter pin, nut, washer, and bolt from upper end of link.
(8)
Install bolt in any lug of the swashplate rotating ring and position this lug opposite of the LCT/link arm of
the swashplate stationary ring.
(9)
Attach dial indicator scale to bolt.
(10) Pull scale down in a curved motion following path of swashplate as it tilts. Read scale after ring begins to
move. Force needed to keep swashplate moving shall be less than 63.5 lbs.
NOTE
Do not read force needed to start swashplate tilt. This includes added force needed to overcome inertia.
(11)
If force is greater than 63.5 lbs, replace swashplate.
(12)
Remove scale, remove bolt.
(13)
Install LCT bolt, washer, nut either lAW install AFT swashplate Task 5-133, or install FWD swashplate
Task 5-132 for CH-47D/MH-47D aircraft, or install AFT swashplate Task 5-188, or install FWD swashplate Task 5-187 for
MH-47E aircraft.
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