Summary of the Problem. - TB-1-1520-237-20-2100002

TB 1--1520--237--20--210

(1) Wholesale Stock. Upon receipt of this TB all serviceable items (condition codes "A", "B", "C",

"D", and "E"), identified through the paragraph 8 inspection shall be 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 TB in accordance with paragraph 14.d.(1). Only those paragraph 6 assem-

blies with a paragraph 7 pitch horn installed, that has more than 1,000 hours useful life remaining, based on

the life specified in paragraph 9, may be issued. No individual paragraph 7 pitch horns will be issued.

(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. Only those paragraph 7 parts that are known to

have more than 500 useable hours remaining, based on the life specified in paragraph 9, may be installed

on aircraft. Disposition of materiel will be IAW paragraph 10. Report compliance with this TB IAW paragraph

14.d.(2).

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

with a paragraph 7 item installed. Tag each paragraph 6 and 7 part or assembly with a suspended tag/label

-- material, DD Form 1576/DD Form 1576--1. Do not remove original condition tags. Correct IAW paragraph

9. Report compliance with this message IAW paragraph 14.d.(2).

Task/Inspection Suspense Date. Within next 10 flight hours/14 days.

Reporting Compliance Suspense Date. No later than 6 Jan. 1999 per paragraph 14.a of this TB.

Summary of the Problem.

a. As required by the flight safety parts program, six specimen pitch horns, P/N 70102--08111--047,

manufactured by the TEK Precision Company under a spindle overhaul contract through the ROTAIR Corpo-

ration have completed fatigue testing. Results of the tests indicate a retirement life less than the original quali-

fied part. The original qualified part from Sikorsky aircraft has a retirement life of 20,000.

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

This TB has two purposes.

(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.

End Items to be inspected. All H--60 aircraft.

Assembly Components to be Inspected.

NOMENCLATURE

PART NUMBER

NATIONAL STOCK NUMBER

Main Rotor Spindle Assy

70070--10030--042

1615--01--331--2480

Main Rotor Spindle Assy

70070--10030--046

1615--01--249--4107

Main Rotor Spindle Assy

70102--08100--059

1615--01--127--0839

Main Rotor Spindle Assy

70102--08200--042

1615--01--209--1759

Main Rotor Spindle Assy

70102--08200--044

1615--01--214--6602

Main Rotor Spindle Assy

70102--08200--051

N/A

Main Rotor Spindle Assy

70102--08200--052

N/A

Main Rotor Spindle Assy

70102--08200--054

1615--01--372--9604

Main Rotor Spindle Assy

70102--08200--056

1615--01--374--7203

Main Rotor Spindle Assy

70102--08200--061

N/A

Main Rotor Spindle Assy

70102--08200--062

N/A