TB 1-1520-240-20-85
Remove blocks when the hydraulic power is supplied.
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
Upper Boost Actuator
145H6600-9
145H6600-10
145H6600-11
145H6600-12
145H6600-19
145H6600-20
Upper Boost Actuator
145H6700-8
145H6700-9
145H6700-10
145H6700-11
145H6700-18
145H6700-19
Swashplate Assembly
145R3551-1
145R3551-2
145R3551-5
145R3551-6
145R3551-11
145R3551-12
145R3551-17
145R3551-18
7.
Parts to be Inspected - N/A.
8.
Inspection Procedures -
a. Perform a one time records check of the upper boost actuators to determine if CCAD overhauled the actuator. If
records check is inconclusive, perform visual inspection of the component data plate. If the unit is unable to determine if
CCAD overhauled the actuators, report as unidentifiable. Report the results to logistical point of contact (paragraph 16b).
Corpus Christi Army Depot actuators may be operated up to 12 months from the date of this TB provided paragraph 9a
below is complied with.
b. Perform uniball bearing friction checks, Task 5-114 and swashplate bearing friction check, Task 5-115 of TM 55-
1520-240-23 and for the 'E" model TM 1-1520-252-23, Task 5-165 and 5-167. Report the results to technical point of
contact (paragraph 16a) per paragraph 14b(1) of any swashplate that fails the frictional pull checks per paragraph 14b(2).
9. Correction Procedures -
a. Aircraft that have one or more CCAD overhauled actuators installed may be flown for up to 12 months from the
date of this TB, and must have upper boost actuator blocks, P/N 114E5900-17, NSN 1730-01-264-6254 installed anytime
the hydraulic power is off.
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