TB
1-1520-237-20-205
(1) Surface/Air Shipment. Prior to first flight/within 10 days of arrival.
(2) Ferry Status. Inspect at final destination.
e.
f. Component/Parts in Stock including War Reserves at All Levels (Depot and Others). Upon receipt
of this Technical Bulletin the material condition tags of all items in all condition codes listed in paragraphs 6
shall be annotated to read "UH-60-98-ASAM-04. Loose Huck bolts on overhauled primary servos, yaw
boost servos, collective boost servos and Tail Rotor Servos not complied with".
(1) Wholesale Stock. Report receipt of this message IAW paragraph 14d(1). Upon receipt of this
TB all serviceable items (Condition codes //A//, //B//, //C//, //D//, and //E// listed in paragraphs 6 located in
wholesale depot storage shall be placed in condition code //J// and tagged with a suspended tag/label. Materi-
al, DD form 1575/DD Form 1575-1. Do not remove original condition tags. Report compliance with this mes-
(2) Retail Stock. Report receipt of this Technical Bulletin IAW paragraph 14d(2). Upon receipt of
this Technical Bulletin Commanders and others maintaining retail stock at installation level and below shall
contact the supported Aviation Unit to perform the inspection required by paragraph 8 and the correction pro-
g. Components/Parts in work (Depot Level and others). Items listed in paragraphs 6 in work will not
be issued until compliance with this Technical Bulletin is complete.
Task/Inspection Suspense Date. Within next 30 flight hours or 30 days, whichever occurs first.
2.
3. Reporting Compliance Suspense Date. No
later than 1
April 1998 per paragraph 14a of
this Technical
Bulletin.
4.
Summary of the Problem.
a. Corpus Christi Army Depot (CCAD) improperly installed collars onto some of the swaged pins (Huck
Bolts) during rework of the H-60 primary servo assembly, collective boost servo assembly, yaw boost servo
assembly, and tail rotor servo assembly during overhaul.
(1) Some of the collars may too loose which could result in pin failure through fretting. Two of the
pins on the primary servo can only be inspected after removal of the servo. The remainder of the pins are
accessible while installed on the aircraft.
(2) All assemblies with a rework date of 31 July 1997 and prior have the suspect installation.
(3) CCAD has adjusted the rework procedures and any assemblies with a rework data after 31
July 1997 do not have the suspect installation.
b.
c. The purpose of this Technical Bulletin is to require a visual and physical inspection of all H-60 aircraft
for paragraph 6 servo assemblies with improperly installed swaged pin fasteners.
End Items to be inspected. All H-60 Aircraft.
5.
6.
Assembly Components to be Inspected.
Part Numbers
MFG Part No.
NSN
Nomenclature
274000-1019/-1021/-1
70410-02820-046/-050
Primary Servo
025/-1027/-1031
/-051/-052/-053/-054
Assembly
2