URGENT
TB 1--1520--240--20--150
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.
18 October 2002
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
NOTE
THIS PUBLICATION IS EFFECTIVE UNTIL RESCINDED OR SUPERSEDED.
NOTE
In accordance with AR 95-1, paragraph 6-6A/6-14A, MACOM Com-
manders may authorize temporary exception from message require-
ments. 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 consequences of continued aircraft operation.
Priority Classification.
Urgent
2.
Summary
a. Background -- During ground run, a CH--47D Chinook aircraft experienced an aft rotating ring drive
arm lug failure that resulted in a Rotor Blade strike to the fuselage, upper tunnel cover and other significant
aircraft damage. Investigation has revealed that this incident was the end result of an Aft Swashplate Bearing
failure.
b. Message Purpose --
(1) Require an immediate and recurring (every 100 flight hours) visual inspection of all H--47 For-
ward and Aft Swashplate Bearings.
(2) Require an immediate grease purge of all H--47D/F Forward and Aft Swashplate Bearings.
(3) Require an immediate and recurring (every 50 flight hours) grease sample of all H--47D/F For-
ward and Aft Swashplate Bearings.
from every 100 flight hours to every 50 flight hours.
This TB supersedes USAAMCOM Message, 042115Z Oct 02 SOF CH-47-03-01
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