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
Main Rotor De-Ice Power
7-311A10025-3
Distributer
Derotation Unit
7-519720075-3
7. PARTS AFFECTED.
Nomenclature
Part Number
National Stock Number
Quantity
Drive Plate Cover, Main
7-319720014
1
Rotor, AH-64A
Drive Plate Cover, Main
7-511310299-3
1
Rotor, AH-64D
Cover, Derotation Unit
7-511310317-1
1
Retaining Ring
7-311411103-3
1
Retention Nut
7-311411102-5
1
Main Rotor Retention
HS5287P06-01
12
Bolts
Nut, Self-locking
MS21042L3
6
Washer, Flat
TX90790-34
6
Bolt, Machine
MS20073-03-10
8
Bolt, Machine
MS20073-03-6
8
Washer, Flat
AN960KD10
8
Screw, Close Tolerance
NAS1203-7
4
Bolt, Close Tolerance
HS5798-5-16
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