Auxiliary Power Unit (APU) Clutch P/N 388600-5, 125 Bearing Replenish or Replace For All AH-64 Aircraft

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This publication is effective until rescinded or superseded.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.