Summary of the Problem. - TB-1-1520-237-20-2180002

TB 1--1520--237--20--218

to read UH--60--00--ASAM--04 (TB 1--1520--237--20--218), Inspection of Tail Landing Gear Shock Strut As-

sembly for Missing Bearing Retention Pin, not complied with".

(1) Wholesale Stock. N/A.

(2) Retail Stock. Upon receipt of this TB 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 procedures of paragraph 9 on discrepant materiel. Report compliance with

g. Component/Parts In Work (Depot Levels and Others). Items listed in paragraph 6 in work will not

be issued until they are in compliance with this TB.

2. Task/Inspection Suspense Date. Complete the inspection IAW para 8 within next 10 flight hours but

NLT 8 March 2000.

Reporting Compliance Suspense Date. No later than 15 March 2000 IAW para 14.a of this TB.

Summary of the Problem.

a. Structural failure of a shock strut has been attributed to missing bearing retention pins (identified

as "nut, plain round" in TM 1--1520--237--23P), P/N 70250--13143--101 in a Tail Landing Gear Shock Strut

Assembly, P/N 70250--13101--044. Further investigation uncovered similar discrepancies in both the upper

and lower stages of other 70250--13101--044 struts. If a strut with this discrepancy has been in service, fa-

tigue damage may be present in the casing depending on the number and location of missing pins.

b. For manpower/downtime and funding impacts, see paragraph 12.

c. This purpose of this TB is to inspect all 70250--13101--044 tail Landing Gear Shock Strut Assemblies

for missing bearing retention pins and correct any discrepancies.

(1) Require a one time inspection to locate pitch horns specified in paragraph 7 which are

installed on aircraft or in supply.

(2) Establish a reduced retirement life of 2,500 hours for specific serial numbered pitch horns,

P/N 70102--08111--047, identified in paragraph 7.

5. End Items to be inspected. All H--60 aircraft prior to serial number 98--26818. Aircraft serial numbers

98--26818 and subsequent will have been inspected/corrected by contractor during production and therefore

records for aircraft serial numbers 98--26818 and subsequent will not require identification of this action.

Assembly Components to be Inspected.

NOMENCLATURE

PART NUMBER

NATIONAL STOCK NUMBER

Tail Landing Shock Strut Assy

70250--13101--044

1620--01--421--0890

a. Serial Numbers C002--02144 through C002--02416

b. Serial Numbers F002--00001 through F002--00110

Parts to be Inspected. N/A.

Inspection Procedures.

a. The Tail Landing Gear Shock Strut Assembly on the aircraft serial numbers prior to 98--26818 must

be checked visually. If the strut assembly serial number is not one of the paragraph 6 items, the inspection

is complete. If the strut serial number is one of the paragraph 6 items and includes a "/R" or "/R1" after the

serial number, then the strut assembly has already been inspected for this discrepancy and the inspection

is complete. Report the results IAW paragraph 14b.