AD 92-27-14

92-27-14 AIRBUS INDUSTRIE: Amendment 39-8449. Docket No. 92-NM-100-AD. Supersedes AD 90-11-51 R1, Amendment 39-6635.

Applicability: Model A320 series airplanes; equipped with Garrett Auxiliary Power Unit (APU) GTCP36-300[A], Part No. 3800278-2, excluding serial numbers P-453, P-454, and R-477 and subsequent; and APU's modified in accordance with Garrett Service Bulletin GTCP36-49- 6525, any revision; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent potential damage to the fuselage and flight controls, and subsequent reduced controllability of the airplane, accomplish the following:

(a) Within 72 hours (clock hours, not flight hours) after July 2, 1990 (the effective date of AD 90-11-51 R1, Amendment 39-6635), accomplish the procedures specified in paragraphs (a)(1) and (a)(2) of this AD: (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 July 2, 1990 (the effective date of AD 90-11-51 R1, Amendment 39-6635), install an external secondary turbine containment shield assembly, Part Number 3615644-1, in accordance with Garrett Alert Service Bulletin GTCP36-49-A5973, dated May 17, 1990; or Revision 1, dated May 22, 1990. Installation of this containment shield assembly constitutes terminating action for the requirements of paragraph (a) of this AD.

(c) Within 24 months after the effective date of this AD, remove the external secondary turbine containment shield assembly, Part No. 3615644-1, and install a new external secondary turbine containment shield assembly, Part Numbers 3615898-1 and 3615899-1, in accordance with Garrett Service Bulletin GTCP36-49-6549, dated February 28, 1992. Installation of this containment shield assembly constitutes terminating action for the requirements of paragraphs (a) and (b) of this AD.

(d) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Standardization Branch, ANM-113.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Manager, Standardization Branch, ANM-113.

(e) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

(f) The installation and replacement shall be done in accordance with the following Garrett service bulletins, which contain the specified effective pages:

Service Bulletin Referenced and Date

Page Number Revision Level Shown on Page Date Shown on Page GTCP36-49-A5973, Revision 1, May 22, 1990 1, 3, 5, 7-8, 11-12

2, 4, 6, 9-10, 13-14 1

Original May 22, 1990

May 17, 1990 GTCP36-49-A5973, May 17, 1990 1-6, 9-14

7-8 Original

(removed) May 17, 1990 GTCP36-49-6549, February 28, 1992 1-16 Original February 28, 1992

This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Garrett Airline Services Division, Technical Publications, Department 65-70,P.O. Box 52170, Phoenix, AZ 85072-2170. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(g) This amendment becomes effective on February 8, 1993.