URGENT
*TB 1-1520-238-30-19
DEPARTMENT OF THE ARMY TECHNICAL BULLETIN
AUXILIARY POWER UNIT (APU) CLUTCH P/N
3886000-5,125 HOUR BEARING REPLENISH OR
REPLACE FOR ALL AH-64 AIRCRAFT
Headquarters, Department of the Army, Washington, D.C.
6 February 2004
DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited.
NOTE
This publication is effective until rescinded or superseded.
1. PRIORITY CLASSIFICATION. URGENT.
1.1 Aircraft in use. IAW SOF AH-64-04-01.
1.2 Aircraft in AVUM, AVIM, or depot level maintenance. IAW SOF AH-64-04-01.
1.3 Aircraft in Transit. IAW SOF AH-64-04-01.
1.3.1 Surface/Air Shipment. IAW SOF AH-64-04-01.
1.3.2 Ferry Status. IAW SOF AH-64-04-01.
2. SUMMARY OF PROBLEM.
2.1 Summary. Since May 2003 there have been 9 APU clutch failures that have caused extensive aircraft
damage. Engineering investigation indicates that the failures may be caused by a lack of grease in the clutch
output bearing or contamination of the grease with APU oil in the output bearing. Longer APU operating times
may be a factor.
2.2 Purpose.
2.2.1 Require an APU clutch P/N 3886000-5 initial and 125 hour recurring output bearing maintenance/in-
spection to be performed IAW this TB at the AVIM level.
3. END ITEMS AFFECTED - All AH-64 aircraft.
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