TB 1-1520-238-20-76
2. Task/inspection Suspense Date. 60 days upon receipt of this TB.
4. Summary of the Problem.
a During APU operation, a field unit discovered fuel or oil leakage from bottom of APU Fuel Nozzle. Inspection of
the Fuel Nozzle revealed a defective gasket (P/N 3612610-1 ) initiated leakage. This may cause severe damage to the
APU.
b. For manpower/downtime and funding impacts, see paragraph 12.
c. The purpose of this TB is to direct a one time replacement of ail AH-64 APU fuel nozzle gaskets and torque three
machine bolts (P/N MS9565-06) to proper torque.
5. End Items to be Inspected. All AH-64 Aircraft.
6. Assembly Components to be Inspected. N/A
7. Parts to be Inspected. N/A
8. Inspection Procedures. N/A
9. Correction Procedures,
NOTE
The new fuel nozzle gaskets will be disseminated fleetwide. Contact Logistical
point of contact per paragraph 16b.
a.
Safe the aircraft lAW reference 13a., task 1.57.
b.
Gain access to doors T250L, T250R, T290L, T290R, and L325 IAW reference 13a paragraph 2.2.
c.
Remove APU upper center cover in accordance with reference 13a. paragraph 15.41.3, step c (1) thru c (3).
d.
Disconnect 'B" nut from fuel nozzle in accordance with reference 13a., paragraph 15.27.3, step c (1).
e.
Remove discrepant fuel nozzle gasket in accordance with reference 13a, paragraph 15.27.3, steps g(1) thru g(3).
Compressed air shall not be used for cleaning purposes except where reduced to
less than 30 psi and only then with effective chip guarding and personnel protec-
tion equipment.
Dry deaning solvent is potentially dangerous to personnel and property. Use in
well ventilated area as the fumes are dangerous if inhaled. Avoid repeated and
prolonged skin contact. Do not use near open flame or excessive heat.
f. Clean fuel nozzle in accordance with reference 13a paragraph 1.47. Remove any residue dry cleaning solvent by
drying part thoroughly with clean lint-free cloth or filtered compressed air.
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