TB 1-1520-238-30-14
5.
End Items to be inspected.
a. All AH-64A aircraft, serial numbers 82-23355 and subsequent.
b. Maintenance trainers (category A and B), same as paragraph 5.a.
6.
Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Spar Box Assembly
Vertical Stabilizer
7-311122601-33
7.
Parts to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Skin, R/H
7-311122601-4
Skin, L/H
7-311122601-5
8. Inspection Procedures.
a. This procedure requires visually inspecting the Vertical Stabilizer for fretting corrosion (black residue) around the
circumference of the Rivet Heads. If black residue is evident perform the following inspection procedure.
CAUTION
Do not use strong solvents (MEK, Trichloroethane, etc.) to clean the stabilizer for
this Inspection. Do not forcefully scrub surfaces to be inspected. Protect nearby
wiring and exposed parts from splashing or spillage of detergents. Failure to
properly clean the inspection surface may result in mis-interpreting soil and soot
stains as indications of working rivets.
b. Clean the vertical stabilizer spar box using washing compound (P-D-410) and aircraft sponges (L-S-626). Rinse
the area immediately. The inspection area must be free of all oil and engine exhaust residue.
c. Visually inspect the cleaned area using a 5X (5 power or equivalent) magnifying glass (GG-M-95). Check for
black residue around the perimeter of the rivet head(s). If residue is present, perform the rework procedure in
d. Check suspect rivets for looseness. Use care not to damage rivet heads. If rivets can be rotted by hand, perform
the rework procedure in paragraph 9.
e. If no evidence of black residue, rivet rotation or looseness is found, this completes the inspection procedure. No
further action is required.
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