TB 1--1520--238--20--106
f.
Component/Parts in Stock Including War Reserves at All Levels (Depot and Others). N/A.
2.
Task/Inspection Suspense Date. Prior to next flight.
3.
4.
Summary of the Problem.
a. A number of AH--64A and AH--64D aircraft which have had tail boom improvement ECP 1315 (RSN
97A001) applied have been found to have Vertical Stabilizer Attachment Bolts shanking at the grip (non--
threaded portion of bolt). The asymmetrical stresses induced into the bolt, added to flight loads could cause
bolt to fail.
b. For manpower/downtime and funding impacts, see paragraph 12.
c.
The purpose of this TB is to ensure that the Vertical Stabilizer attachment hardware is installed cor-
rectly.
5.
End Items to be inspected. All AH--64 series aircraft.
Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
Vertical Stabilizer
7--31122600
7.
Parts to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Bolt Shear
HS 5798-9-24
5306--01--465--8474
Barrel Nut
HS 5813--9
5310--01--463--1730
Retainer
NAS 578-9B
5340--00--853--9862
Washer, Recessed
MS20002C9
5310--00--596--1712
Inspection Procedures.
NOTE
ECP 1315 has been applied to all AH--64D Longbow aircraft during the remanufacturing
process, therefore any reference to ECP1315 will not be annotated in the Historical Re-
cords of the AH--64D (i.e. all AH--64D's are affected).
a. Prior to next flight, inspect records to determine wether ECP 1315 (RSN97A001) has been applied.
If records search is inconclusive, evidence that ECP1315 has been applied is tail boom slot closure and pres-
ence of elastomeric stabilator mounts. If the ECP has been applied, inspect bolts attaching Vertical Stabilizer
to tailboom for proper installation and torque. If ECP 1315 (RSN97A001) has not been applied, the inspection
is complete.
b. If the barrel nut is visible through the retainer, check to see that the end of the bolt can be seen by
looking for the chamfer or a partial thread.
NOTE
Barrel Nut run-on torque shall be 24 inch pounds minimum.
c. If the end of bolt can be seen, retorque to assure bolt is properly torqued. Retorque only one bolt
at a time. Torque bolts to 75 inch pounds. Then torque each bolt in increments of 350 in pounds to 1350--1420
inch pounds.
2
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