Engine Vibration Screening and Recurring Inspection For All Ah-1 Series Aircraft With T53-L-703 Engine (P/N 1-000-060-23) Installed

URGENT

*TB 1-2840-229-20-17

DEPARTMENT OF THE ARMY TECHNICAL BULLETIN

ENGINE VlBRATION SCREENING AND RECURRING

INSPECTION FOR ALL AH-1 SERIES AIRCRAFT WITH

T53-L-703 ENGINE (P/N 1-000-060-23) INSTALLED

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

28 July 1998

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

NOTE

THIS PUBLICATION IS EFFECTIVE UNTIL RESCINDED OR

SUPERSEDED.

1. Priority Classification. URGENT

NOTE

See AR 95-1, paragraph 6-6.a., for noncompliance authority of major

commanders.

a. Aircraft in Use. Upon receipt of this TB, change the condition status symbol of the cited aircraft

to a Circled Red X. The Circled Red X entry shall state "T53-L-700 Engine N2 vibration inspection

procedures required IAW TB 1-2840-229-20-17 (SOF AH-1-98-01)." Enter a Red Dash status symbol.

The entry shall state "Commander and flight crew member review of risk mitigation measures lAW TB

1-2840-229-20-17 (SOF AH-1-98-01) required prior to flight." This is a recurring daily entry. If the engine

passes the vibration inspection per paragraph 8. of this TB, clear the Circled Red X status symbol and

release the aircraft for flight. If the engine fails the vibration inspection, change the aircraft status symbol to

a Red X. lnspect the aircraft as soon as practical, but not later than the task/inspection suspense date.

Change the aircraft symbol to a Red X for aircraft not inspected by this date. While on a Circled Red

X, continue to report the aircraft as fully mission capable (FMC).

b. Aircraft In Depot Maintenance. Aircraft will not be issued until compliance with this TB has been

completed.

c. Aircraft Undergoing Maintenance. Aircraft will not be released until compliance with this TB has

been completed.

*This TB supersedes USAAMCOM Safety of Flight (SOF) Message AH-1-98-01, 242118Z, JUN 98.