TB 1-1520-240-20-103
4.
Summary of the Problem.
a. Two reports have been received documenting that the wrong bolt was installed between the aft up-
per boost actuators and the aft stationary swashplate. Both aircraft had come out of the refurbishment/stan-
dardization program at CCAD. In addition, confusion may exist when trying to identify the correct bolt due
to incorporation and labeling of the forward and aft controls installation on the same page of the parts manual.
b.
For manpower/downtime and funding impacts, see paragraph 12.
c. The purpose of this TB is to require a one time verification of hardware installation of the aft upper
boost actuators to stationary swashplate for proper attachment.
End Items to be Inspected. All CH/MH-47D/E aircraft.
5.
6.
Assembly Components to be Inspected.
PART NUMBER
NATIONAL STOCK NUMBER
NOMENCLATURE
Rotor Wing Head Controls Instal-
145R3550-6
N/A
lation
7.
Parts to be Inspected.
PART NUMBER
NATIONAL STOCK NUMBER
NOMENCLATURE
Bolt
145R3650-1
8.
Inspection Procedures.
a.
Prepare aircraft for safe ground maintenance.
NOTE
The 145R3650-1 bolt assembly consists of a P/N BACB30ST10-52 bolt and a P/N
145R3116-3 hat bushing. Bolts with the BACB30ST10-52 marking should also con-
tain the Boeing P/N 145R3650-1 vibroetched in the dish area of the bolt. Bolts with
BACB30ST10-52 marking only should be visually checked to insure the hat bushing
is installed under the head of the bolt. If the hat bushing is not installed, replace bolt
in accordance with paragraph 9.
b. Inspect the head of the bolt which attaches both of the upper boost actuators (swiveling and pivoting)
to the aft stationary swashplate. Refer to Reference 13a, Figure 177, Item 37 for CH/MH47D aircraft and
Reference 13b, Figure 5-6, Item 37 for MH-47E aircraft. Both bolts part number should be 145R3650-1.
c. If part number 145R3650-1 bolts are installed, no further action is required. If other than this bolt
is installed, proceed with correction procedures in paragraph 9.
9. Correction Procedures.
a. Remove upper boost actuator (UBA) to stationary swashplate bolt only, in accordance with Refer-
ence 13c, Task 7-125 Pivoting and Task 7-127 Swiveling for CH/MH-47D aircraft and Reference 13d, Task
7-147 Pivoting and Task 7-149 Swiveling for MH-47E aircraft.
b. Inspect for damage to the UBA, swashplate. Repair damaged parts as authorized by References
13c and 13d.
c.
Contact the logistical POC listed at paragraph 16b for instructions regarding bushing replacement.
10. Supply/Parts and Disposition.
a.
Parts Required. Items cited in paragraph 7 may be required to replace defective items.
b. Requisitioning Instructions. Requisition replacement parts through normal supply channels using
normal supply procedures. All requisitions shall use project code (CC 57-59) `XDW, `X-RAY-DELTA-
WHISKEY" per this TB.
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