TB l-1520-238-20-91
2.
Suspense Date. NLT next phase.
3. Reporting Compliance Suspense Date. N/A.
4. Summary of Problem.
a.
Field reports have indicated the possibility of cracks and corrosion existing in the Engine Nacelle
Longerons (P/N 7-311140134).
b.
The purpose of this TB is to perform a one time and recurring phase inspection of the Engine
Nacelle Longerons (7-311140134) for cracks, locate and drill a drain hole on the aft end of the
repair procedure.
Longerons for corrosion control and provide a
c. For manpower/downtime and funding impacts see paragraph 13.
End Items to be Inspected. All Army
helicopters serial numbers 82-23355 and
5.
subsequent.
Assembly Components Affected.
6.
Part No.
Nomenclature
1560-01-254-l 693
7-31114011 o-53
Nacelle, Engine, LH
7-31114011 o-54
Nacelle, Engine, RH
Parts to be Inspected.
7.
Part No.
Nomenclature
7-311140134-1, -11
Longeron, LH
Pending
7-311140134-2, -12
Longeron, RH
Inspection Procedures.
8.
CAUTION
Ensure that a foreign object damage (FOD) prevention program is implemented in accordance with
AR 385-95, chapter 4.
a.
Safe the helicopter IAW task 1.57 of reference
b.
Open the Engine Nacelle Access Doors
Visually inspect the upper and lower edge of the flange at the aft end of the 7-311140134
Longerons for cracks.
1)
Pay particular attention for the possibility of a crack starting at one of the
diameter Pin
Rivets that attaches the
to the Aft Fitting Assembly P/N 7-311140048.
2)
If a crack is identified, determine its location and direction. If the crack extends from the
fastener hole to the edge of the part, proceed to paragraph 10, Repair Procedure. If the crack
extends into the radius of the
contact the technical POC,
17, for further
disposition.
2
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