TB 1-1520-238-20-73
f. Component/Parts in Stock Including War Reserves at All Levels (Depot and Others).
(1) Retail stock. N/A.
(2) Wholesale Stock. N/A.
2. Task/Inspection Suspense Date. Prior to completion of next 250 flight hour phase inspection.
3. Reporting Compliance Suspense Date. N/A.
4. Summary of the Problem.
a. A recent accident investigation has revealed a missing fastener in the Tail Rotor Servocylinder
Linkage Assembly. The loss of the fastener (P/N NAS1452-26) was the result of the swaged collar (P/N
NAS1080C12) coming off. The fastener installation is performed at the Servocylinder manufacturer only and is
not an AVIM or AVUM task. The fasteners (Huck Bolts) on the Main Rotor Servocylinders and Tail Rotor
Cylinder shall be inspected at every 250 flight hour phase inspection.
b. For manpower/downtime and funding impacts, see paragraph 12.
c. The purpose of this TB is to inspect all AH-64 aircraft for loose or damaged fasteners in the flight
control linkage of the Main and Tail Rotor Servocylinders at every 250 hour phase inspection. Discrepant
Servocylinders (reference paragraph 8) will be removed and replaced. (No repair will be allowed).
5. End Items to be Inspected. All AH-64 Aircraft.
6. Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
NATIONAL STOCK NUMBER
Servocylinder Collective/Lateral
289300-1017
1650-01 -273-7610
289300-1003XY
1650-01 -243-1727
289300-1003XYW
1650-01 -279-4703
289300-1019
1650-01 -273-7610
289300-1021
1650-01 -279-4703
Servocylinder Longitudinal
308900-1013
1650-01 -273-7609
308900-1003XY
1650-01 -242-1497
308900-1003XYW
1650-01 -279-4701
308900-1015
1650-01 -273-7609
308900-1017
1650-01 -279-4701
Servocylinder Directional
289400-1007
1650-01 -273-7608
289400-1001 XY
1650-01 -159-4480
289400-1001 XYW
1650-01 -279-4702
289400-1009
1650-01 -273-7608
289400-1011
1650-01 -279-4702
7. Parts to be Inspected. Obtain drawings from LAR or Technical point of contact to identity locations of
Huck type fasteners.
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