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  TB 1-1520-238-20-136
5. END ITEMS AFFECTED. All Army AH-64 AIRCRAFT.
6. ASSEMBLIES AFFECTED.
Nomenclature
Part Number
National Stock Number
Main Rotor Head Assy
7-311410003-607/-609/-611/-613
N/A
/-619/-621/-625
Mast Mounted Assy (ADS)
7-319720029-3
1560-01-179-0775
Main Rotor De-Ice Power
7-311A10025-3
1650-12-326-3293
Distributer
Derotation Unit
7-519720075-3
6110-01-425-7237
7. PARTS AFFECTED.
Nomenclature
Part Number
National Stock Number
Quantity
Drive Plate Cover, Main
7-319720014
1615-01-170-2876
1
Rotor, AH-64A
Drive Plate Cover, Main
7-511310299-3
5340-01-429-4980
1
Rotor, AH-64D
Cover, Derotation Unit
7-511310317-1
5340-01-468-8254
1
Retaining Ring
7-311411103-3
5325-01-255-9314
1
Retention Nut
7-311411102-5
5310-01-350-1346
1
Main Rotor Retention
HS5287P06-01
5306-01-331-2588
12
Bolts
Nut, Self-locking
MS21042L3
5310-00-807-1474
6
Washer, Flat
TX90790-34
5310-00-167-0834
6
Bolt, Machine
MS20073-03-10
5306-00-145-7008
8
Bolt, Machine
MS20073-03-6
5306-00-145-7006
8
Washer, Flat
AN960KD10
5310-01-134-5794
8
Screw, Close Tolerance
NAS1203-7
5305-00-754-2064
4
Bolt, Close Tolerance
HS5798-5-16
5306-01-468-1667
12
8. PROCEDURES.
WARNING
Since the Temporary Cover Plates can be made of either steel or alu-
minum and there is no insulator (gasket) other than primer, there
could be a dissimilar metal corrosion problem if the covers are left on
especially near a salt water environment.
Therefore, the covers
should be removed in a timely manner when the test flight is com-
plete.
NOTE
Temporary Cover Plates are to be used only for test flight purposes and nev-
er for mission use.
8.1. AH-64A Procedure
5
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