MWO 55-1520-240-20-2
NOTE
Bolts have been shipped to CH-47D
users. For additional infor-
mation contact USAAVSCOM CH-47 PMO.
POC is Mr. Norm Huston or CPT Paul
Hutzky, AUTOVON 693-1440 or Commercial
(314) 263-1440.
Mutilate and demilitarize the following removed
b.
Parts Disposition.
items.
NATIONAL STOCK
PART NUMBER
NOMENCLATURE
NUMBER
FSCM
Bolt
145DS303-1
77272
145DS303-2
77272
5306-01-115-9685
Bolt
9.
SPECIAL TOOLS, TOOL KITS: JIGS: TEST, MEASUREMENT AND DIAGNOSTIC
EQUIPMENT (TMDE) AND FIXTURES REQUIRED. Not Applicable.
MODIFICATION
PROCEDURES.
10.
a. Prepare the aircraft for safe ground maintenance and gain access
to the left and right engine drive shafts in accordance with
TM55-1520-240-23, Task 2-2.
Inspect each shaft assembly to determie its part number.
b.
(1) If it is P/N 145D3550-15, the assembly has strong bolts and
reworked adapters. No further action is required other than reporting
compliance with this MWO. This assembly does not require a recurring 100
hour bolt inspection.
(2) If it is P/N 145D3500-12, the assembly already has strong
bolts, but both adapters have not been reworked. Bolts, P/N 145DS303-3,
require inspection at 100 hours since new, and every 100 flight hours
thereafter. See paragraph 10d.
(3) If it is P/N 145D3500-8, the assembly has hollow bolts and
the adapters have not been reworked. The bolts must be replaced with the
stronger P/N 145DS303-3 and P/N 145DS303-4 bolts within the next 5 flight
hours or ten days, whichever occurs first. The P/N 145DS303-3 must be
inspected at the next 100 hour interval and at each 100 hour interval
thereafter. See paragraph 10d. The P/N 145D3500-8 assembly has now become
a P/N 145D3500-12 assembly.
If bolt replacement is required , replace all twenty four (24)
c.
shaft attachment bolts in the left and right drive shaft assemblies as
follows:
(1) Replace P/N 145DS303-1 (TM 55-1520-240-23P-1, Fig. 199, items
179 and 193) with P/N 145DS303-3 and replace P/N 145DS303-2 (TM 55-1520-
240-23P-1 , Fig. 199 items 175) with P/N 145DS303-4.
3
