DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
ALL AH--64 SERIES AIRCRAFT FOR
INITIAL AND RECURRING INSPECTIONS OF THE TAIL
ROTOR HANGER BEARING NUTATION
Headquarters, Department of the Army, Washington, D. C.
18 February 2000
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
THIS PUBLICATION IS EFFECTIVE UNTIL RESCINDED OR SUPERSEDED.
Priority Classification. Urgent.
a. Aircraft in Use. Upon receipt of this Technical Bulletin (TB) the condition status symbol of the cited
aircraft will be changed to a red horizontal dash //--//. The red horizontal dash //--// entry shall state "In-
spect the Tail Rotor Hanger Bearings Nutation IAW TB 1--1520--238--20--104 within the next 10 flight hours
or no later than (NLT) 28 Feb 00". The red horizontal dash //--// may be cleared when the inspections of
para 8 are completed.
The affected aircraft shall
as practical but NLT
10 flight hours
or 28 Feb 00. Failure to comply with the requirements of this message within the time frame specified will
cause the status symbol of the affected aircraft to be upgraded to a red //X//.
b. Aircraft in Depot Maintenance. Aircraft will not be issued until compliance with this TB has been
c. Aircraft Undergoing Maintenance. Aircraft will not be issued until compliance with this TB has been
d. Aircraft in Transit. For aircraft away from home station, this message authorizes a one time flight,
with intermediate stops, to return to the nearest secured maintenance facility/home station.
(1) Surface/Air Shipment. Same as para 1a.
(2) Ferry Status.
(b) Those aircraft that have a DD 250 and are at Boeing will be inspected prior to ferry to
e. Maintenance Trainers (Category A and B). Same as para 1a.
f. Component/Parts in Stock Including War Reserves at All Levels (Depot and Others). Upon receipt
of this TB, the material condition tags of all items in all condition codes listed in para 6 and 7 shall be annotated
to read (TB 1--1520--238--20--104), "Inspection of Tail Rotor Hanger Bearings Nutation, not complied with".
This TB supersedes USAATCOM Safety of Flight Message 280022Z Jan 00 (AH--64--00--ASAM--09).