TB 1-1520-240-20-88
f. The purpose of this TB is to conduct a visual inspection of all forward transmission lubrication pump
identification plates for suspect serial numbers V534through V598. If found, these pumps are to be removed
from service and returned for rework.
5. End Items to be Inspected - All CH-47D, MH-47D, and MH-47E aircraft.
6. Assembly Components to be Inspected -
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Forward Transmission
145D1300-9
145D1300-8
145D1300-7
145D1300-6
145D1300-5
145D1300-4
7. Parts to be Inspected -
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Pump Assembly, Main
145DS102-3
4320-01-115-3822
8. Inspection Procedures -
a. Prepare the aircraft for safe ground maintenance.
b. Remove the forward transmission drip tray. (Refer to TM 55-1520-240-23 Task 2-3, or TM 1520-25-23 Task 2-
4).
NOTE
Care should be taken to ensure that oil does not get on the center console.
c. Check forward transmission main lubrication pump identification plate for any of the following
suspect serial numbers -
V534
V561
V577
V590
V596
V535
V564
V578
V591
V597
V539
V566
V579
V592
V598
V541
V569
V580
V593
V545
V574
V581
V594
V557
V575
V589
V595
NOTE
Since subject pump assembly is not listed in the TB 1-1500-341 -O1, aircraft components
requiring maintenance management and historical data, performance of a records check to
identify suspect serial numbers is not feasible.
d. If the pumps serial number is in the above list of suspect serial numbers, call the logistical point of contact
(paragraph 15b below) for disposition instructions before proceeding to paragraph 9 below for corrective procedures.
e. If the pumps serial number is not in the above list of suspect serial numbers, no further maintenance action is
required. Record serial number of forward transmission main lubrication pump on the forward transmission, DA Form
2408-16 in the remarks block. Install the forward transmission drip tray, (refer to TM 55-1520-240-23 Task 2-3, or TM 1-
1520-252-23 Task 2-4), and record and report compliance with this TB in accordance with paragraph 13 below.
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