TB 1--1520--238--20--129
(d) Inspect for the presence of metal particles or other combination in the needle bearing cav-
ity. None allowed.
(e) Inspect for damage to the visible portion of the needle bearing and/or shaft. None al-
lowed.
(f) Rotate the output drive on the clutch while observing the needle bearing with a flashlight.
If the output shaft does not rotate smoothly and the needle bearing and/or pilot shaft does not remain
centered during rotation, replace the clutch assembly.
(g) Inspect for signs of overheating, characterized by bluing or yellowing of the metal surface.
None allowed.
CAUTION
Contamination of the bearings or failure to follow the prescribed procedures may cause
premature failure of the needle bearings.
(h) Verify bearing cavity is properly packed with grease (MIL--G--81322). Pack grease
approximately one half cubic inch (1/2 cubic inch) around inside diameter.
(i) Lightly lubricate new packing (P/N M83248/1--113) with grease ( MIL--G--81322) and
install on plug (P/N 3886028--1).
(j) Install plug into the clutch output drive shaft.
(k) Install the spiral lock ring (M27426--3112D) and ensure that it has good positive engage-
ment.
(l) Install anti--flail bracket and APU drive shaft IAW TM or IETM. Check circumferential
clearance.
(12)Check clutch housing bolts for proper torque of 50 inch pounds.
(13)Perform an APU MOC (Maintenance Operational Check) TM 1--1520--238--T or the IETM.
Check for oil leakage from the covered port with the APU running. Replace clutch if the oil leakage rate ex-
ceeds one drop per minute.
9.
Correction Procedures.
a. If any problems are noted when performing the inspection required IAW paragraph 8b of this mes-
sage-- remove and replace the APU clutch IAW the TM or IETM.
b. The following inspection will be added the AH--64A TM special inspection number 11 and the
AH--64D IETM for a hard landing-- check the APU mounts for cracks and distortion.
c. The following inspection will be added to the AH--64A TM special inspection number 21 and AH--64D
IETM sudden stoppage.
(1) Check APU drive shaft and couplings for damage.
(2) Check APU mounts for cracks.
d. The following inspection will be added to the AH--64A TM and AH--64D IETM 10 hour/14 day PMS
inspections-- Inspect anti--flail for contact with the APU drive shaft (indicates drive shaft misalignment). Make
a recurring write--up on a DA Form 2408--13--1 until this PMS inspection is incorporated into the TM and IETM.
e. The following inspection will be added to the AH--64A TM and the AH--64D IETM 250 hour phase
inspection requirements.
(1) Inspect the APU mounts for damage during every 250 hour phase inspection.
(a) Remove APU IAW TM or IETM.
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