AD 90-11-51 R1

90-11-51 R1 AIRBUS INDUSTRIE: Amendment 39-6635. Final copy of, and revision to, telegraphic AD Docket No. 90-NM-103-AD.

Applicability: Model A320 Series Airplanes, equipped with Garrett Auxiliary Power Unit (APU) GTCP36-300[A], Part No. 3800278-2, all serial numbers, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent uncontained turbine rotor separation and subsequent reduced controllability of the airplane, accomplish the following:

A. Within 72 hours (clock hours, not flight hours) after the effective date of this amendment, accomplish the following:

1. Revise the Limitations Section in the FAA-approved Airplane Flight Manual (AFM) to include the following statement. This may be accomplished by inserting a copy of this AD in the AFM Limitations Section. Operation of the APU on the ground is prohibited, and operation of the APU during flight is prohibited, except during an emergency.

2. Install a placard next to the APU start switch in the cockpit to state: Operation of the APU on the ground is prohibited, and operation of the APU during flight is prohibited, except during an emergency.

B. Within 30 days after the effective date of this amendment, install an external secondary turbine containment shield, Part Number 3615644-1, in accordance with Garrett Auxiliary Power Division Alert Service Bulletin GTCP36-49-A5973, dated May 17, 1990, or Revision 1, dated May 22, 1990. Installation of this containment shield constitutes terminating action for the requirements of paragraph A., above.

C. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Northwest Mountain Region.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it to the Manager, Standardization Branch, ANM-113.

D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer, may obtain copies upon request to Garrett Auxiliary Power Division, 2739 East Washington Square, P.O. Box 5227, Phoenix, Arizona 85010. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or the Standardization Branch, 9010 East Marginal Way South, Seattle, Washington.

Portions of this amendment were effective earlier to all recipients of telegraphic AD T90- 11-51, dated May 18, 1990.

This AD revises telegraphic AD T90-11-51, issued on May 18, 1990.

This amendment (39-6635, AD 90-11-51 R1) becomes effective on July 16, 1990.