TB 1--1520--237--20--232
c.
Aircraft in Transit.
(1) Surface/Air Shipment -Same as paragraph 1.a..
(2) Ferry Status - Inspect at final destination but NLT 12 June 2001, whichever occurs first.
d. Maintenance Trainers (Category A, and B). Same as para 1.a..
e. Component/Parts in Stock at All Levels (Depot Level and Others), including War Reserves. N/A.
f.
Components/Parts in Work (Depot Level and Others). N/A.
2. Task/Inspection Suspense Date. Complete inspection requirements of
paragraph 8 NLT 12
June
2001and report IAW para 14.a.(2) NLT 26 June 2001.
3.
Reporting Compliance Suspense Date.
Report compliance IAW para 14.a.(1) NLT 6
June 2001.
Summary of Problem.
a. Recently the U. S. Navy reported problems with the cyclic authority resulting in an aborted takeoff.
Inspection revealed a fractured Self Locking Bolt, P/N 70400-08159-104, in the lateral swashplate link. Engi-
neering analysis confirmed the cause of the fracture to be stress corrosion cracking which originated from
corrosion pits on the inner diameter of the bolt.
b. For manpower/downtime and funding impacts see para 12.
c.
The purpose of this TB is to:
(1) Inspect all H-60 main rotor Self Locking (Pivot) Bolts, washers, and nuts listed in par 7.
(2) Change Self Locking Bolt installation procedures for all H-60 aircraft IAW paragraph 12 of this
TB.
End Items to be inspected. All H-60 series aircraft.
Assembly Components to be Inspected.
NOMENCLATURE
PART NUMBER
NSN
Controls Installation, Swashplate
70400-08200-011/012/
N/A
Linkage
013/041/042/043
Controls Installation, Swashplate
70400-85405-011/012/
N/A
Linkage
041/042/043
Parts to be Inspected.
NOMENCLATURE
PART NUMBER
NSN
Bolt, Self Locking
70400-08159-101
Bolt, Self Locking
70400-08159-102
Bolt, Self Locking
70400-08159-103
Bolt, Self Locking
70400-08159-104
Bolt, Self Locking
70400-08159-105
Bolt, Self Locking
70400-08159-106
Bolt, Self Locking
70400-08159-107
Bolt, Self Locking
70400-08159-108
Washer
MS20002C12
Washer
MS20002C14
2