MANDATORY MAINTENANCE FOR ENGINE DRIVE SHAFT, P/N 145D3504-2, ON ALL H--47 AIRCRAFT

URGENT

TB 1--1520--240--20--151

DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

MANDATORY MAINTENANCE FOR

ENGINE DRIVE SHAFT, P/N 145D3504-2,

ON ALL

H--47 AIRCRAFT

Headquarters, Department of the Army, Washington, D. C.

28 March 2003

DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.

NOTE

THIS PUBLICATION IS EFFECTIVE UNTIL RESCINDED OR SUPERSEDED.

Priority Classification. Urgent

NOTE

MACOM Commanders may authorize temporary exception from mes-

sage requirements in accordance with AR 95--1, Chapter 6. Exception

may only occur when combat operations or matter of life or death in civil

disasters or other emergencies are so urgent that they override the con-

sequences of continued aircraft operation.

Summary

a. Background -- Application of MWO 55-1520-240-50-43 replaced three piece engine drive shaft, P/N

145D3500-15, with a one piece engine drive shaft, P/N 145D3504-2. At that time an interim retirement life

of 2000 hours was established. The interim retirement life was to remain in effect until fatigue testing was

conducted and verified. Based on fatigue test results, the retirement life of P/N 145D3504-2 can safely be

increased to 6000 hours for all but 49 of these shafts. These 49 shafts were flown on certain aircraft during

a specific time frame which cannot allow their retirement lives to be increased. These 49 specific serial num-

bered shafts will remain at the 2000 hour retirement life.

b. Message Purpose -- Increase the retirement life of all but 49 specific serial numbered engine drive

shafts from 2000 hours to 6000 hours.

End Items Affected. All H--47 series aircraft.

Assemblies/Components/Parts Affected

PART NUMBER

NATIONAL STOCK NUMBER

NOMENCLATURE

Engine Drive Shaft

145D3504-2

3010-01-316-2661

This TB supersedes USAAMCOM Message 251331Z MAR 03 CH-47--03--ASAM-01.