INSPECTION OF SWASHPLATE BEARING, FORWARD AND AFT ON ALL H-47 SERIES AIRCRAFT

URGENT

TB 1--1520--240--20--152

DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

INSPECTION OF

SWASHPLATE BEARING, FORWARD AND AFT

ON ALL

H-47 SERIES AIRCRAFT

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

12 February 2004

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

NOTE

THIS PUBLICATION IS EFFECTIVE UNTIL RESCINDED OR SUPERSEDED.

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.

Priority Classification.

Urgent

Summary

a. Background -- Safety of Flight message, CH-47-03-01, established inspection requirements for the

H-47 Forward and Aft Swashplate Assemblies. These inspection requirements included submitting a grease

sample for analysis by the Army Oil Analysis Program (AOAP). Inconsistent results from this program do not

show correlation between grease sample results and actual swashplate assembly damage/condition. The

AOAP grease sampling results can not be considered a reliable method to indicate pending bearing failure

or even used to assess the condition of the swashplate bearings.

b. Message Purpose --

(1) Supercede CH-47-03-01.

(2) Revise the procedure in accordance with paragraph 7.2 of CH-47-03-01.

(3) The visual inspection in accordance with paragraph 7.1 of CH-47-03-01 remains the same.

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

This TB supersedes USAAMCOM Message, 052030Z FEB 04 SOF CH-47-04-01