Summary of the Problem. - TB-1-1520-240-20-1220002

TB 1-1520-240-20-122

(2) Ferry Status.

(a) Inspect at final destination within 10 flight hours or 14 days of arrival.

(b) Those aircraft that have a DD 250 and are at Boeing Helicopters will be inspected prior

to ferry to final destination.

Maintenance Trainers (Category A and B). Comply within 120 days of receipt of this Technical Bulle-

tin.

f. Component/Parts in Stock at All Levels (Depot and Others) including War Reserves. Upon receipt

of this Technical Bulletin Depot and Materiel Activity Commanders will ensure the material condition tags of

all items in all condition codes listed in paragraphs 6 and 7 shall be annotated to read "CH--47--00--ASAM--04

(TB 1--1520--240--20--122) Horizontal Hinge Pin Records Check Not Complied With".

(1) Wholesale Stock -- Upon receipt of this message, Depot and Materiel Activity Commanders

will ensure all serviceable items (condition codes //A//, //B//, //C//, //D//, and //E//) listed in paragraphs 6 and

7 are placed in condition code //J// and tagged with a suspended tag/label -- Materiel, DD Form 1575/DD Form

1575-1. Do not remove original condition tags. Report compliance with this Technical Bulletin in accordance

with paragraph 14D (1).

(2) Retail Stock -- Upon receipt of this Technical Bulletin, Commanders and Facility Managers

maintaining retail stock at Installation level and below shall contact the supported aviation unit to perform the

procedures required in accordance with paragraphs 8 and 9 on suspect materiel. Dispose of discrepant mate-

riel in accordance with paragraph 10. Report compliance with this Technical Bulletin in accordance with para-

graph 14D. (2).

2. Task/Inspection Suspense Date. Complete the inspection in accordance with paragraph 8 within the

next 10 flight hours but no later than 9 AUG 00 and report in accordance with paragraph 14B.

3. Reporting Compliance Suspense Date. Report compliance in accordance with paragraph 14A no lat-

er that 16 AUG 00.

Summary of the Problem.

a. A horizontal hinge pin failed hardness and tensile strength tests during a routine quality assurance

destructive test. It has been determined that some horizontal hinge pins with serial numbers UW2407 and

prior may not have been properly heat treated. Horizontal hinge pins with these serial numbers are required

to be hardness tested at the next overhaul or no later than 4800 flight hours total time since new (TTSN). The

hardness test will be conducted by the overhaul facility. Horizontal hinge pins that pass the hardness test will

be re-identified with a suffix "A" vibro engraved after the serial number.

For manpower/downtime and funding impacts see paragraph 12.

c. The purpose of this Technical Bulletin is to require a records check of all horizontal hinge pins. This

check is required to ensure that all horizontal hinge pins with serial numbers UW2407 and prior are sent in

for hardness checks before they reach a TTSN of 4800 flight hours.

End Items to be inspected . All H--47 series aircraft.

Assembly Components to be Inspected.

NOMENCLATURE

PART NUMBER

NATIONAL STOCK NUMBER

HEAD,ROTARY WING, FWD

145R2003-1

1615-01-118-5634

HEAD,ROTARY WING, FWD

145R2003-3

1615-01-198-7555

HEAD,ROTARY WING, FWD

145R2003-4

1615-01-184-3875

HEAD,ROTARY WING, FWD

145R2003-5

1615-01-345-0477

HEAD,ROTARY WING, FWD

145R2003-6

1615-01-296-9503