AD 91-26-08

91-26-08 AIRBUS INDUSTRIE: Amendment 39-8121. Docket No. 91-NM-87-AD.

Applicability: Model A310 and A300-600 series airplanes, on which Modification 7769 has not been accomplished, certificated in any category.

Compliance: Required within 180 days after the effective date of this AD, unless accomplished previously.

To prevent loss of the Generator Control Units (GCU) and AC electrical power, accomplish the following:

(a) Remove the three currently installed GCU's and replace them with three modified GCU's having protective covers, in accordance with Airbus Industrie Service Bulletins A310-24-2040, Revision 1, dated January 28, 1991 (for Model A310); A300-24-6029, Revision 1, dated February 22, 1991 (for Model A300-600); and Sundstrand Service Bulletin 735226/740206/740120-24-9 (for Models A310 and A300-600), dated June 15, 1989 (Modification 7769); as applicable.

(b) An alternative method 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, Transport Airplane Directorate. The request shall be forwarded through an FAA Principal Avionics Inspector, who may concur or comment and then send it to the Manager, Standardization Branch, ANM-113.

(c) 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.

(d) The installation required by this AD shall be done in accordance with Airbus Industrie Service Bulletin A310-24-2040, Revision 1, dated January 28, 1991 (for Model A310); Airbus Industrie Service Bulletin A300-24-6029, Revision 1, dated February 22, 1991 (for Model A300-600); and Sundstrand Service Bulletin 735226/740206/740120-24-9 (for Models A310 and A300-600), dated June 15, 1989 (Modification 7769). This incorporation by reference was approved by the Director of the Federal Registerin accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Airbus Industrie, Airbus Support Division, Avenue Didier Daurat, 31700 Blagnac, France. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington; or at the Office of the Federal Register, 1100 L Street N.W., Room 8401, Washington, D.C.

(e) This amendment (39-8121, AD 91-26-08) becomes effective on February 14, 1992.