AD 92-25-03

92-25-03 AEROSPATIALE: Amendment 39-8418. Docket No. 91-NM-99-AD.

Applicability: Model SN 601 Corvette series airplanes on which Modifications 1291 and 1368 have not been incorporated, certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent damage to the fuselage passenger door frame skins at the hinge axis, accomplish the following:

(a) Prior to the accumulation of 8,100 landings, or within 100 landings after the effective date of this AD, whichever occurs later, perform a high frequency eddy current inspection of the skins on the upper and lower frames at the level of the passenger door hinge pins to detect cracks, in accordance with Aerospatiale Corvette Service Bulletin 53-21, dated June 25, 1990.

(1) If no crack is found as a result of the inspection required by paragraph (a) of this AD, repeat the inspection at intervals not to exceed 3,300 landings.

(2) If any crack is found as a result of the inspection required by paragraph (a) of this AD, prior to further flight, accomplish Modification 1291, in accordance with Aerospatiale Corvette Service Bulletin 53-22, dated July 20, 1990. Accomplishment of this modification constitutes terminating action for the inspections required by paragraph (a) of this AD.

(b) Prior to the accumulation of 9,100 landings or within 100 landings after incorporation of Modification 1291, whichever occurs later, perform a low frequency eddy current inspection of the upper door frame, and a high frequency eddy current inspection of the lower door frame, to detect damage to the fuselage passenger door frame skins at the hinge axis between Frames 11 and 12, in accordance with Aerospatiale Corvette Service Bulletin 53-23, Revision 2, dated November 6, 1991.

(1) If no damage is found as a result of the inspections required by paragraph (b) of this AD, repeat the inspections at intervals not to exceed 3,600 landings.

(2) If any damage is found as a result of the inspections required by paragraph (b) of this AD, prior to further flight, accomplish Modification 1368, in accordance with Aerospatiale Corvette Service Bulletin 53-8, Revision 1, dated August 20, 1990. Accomplishment of this modification constitutes terminating action for the low frequency eddy current inspection of the upper door frame required by paragraph (b) of this AD; however, the high frequency eddy current inspection of the lower door frame required by paragraph (b) of this AD must continue to be performed at intervals not to exceed 3,600 landings.

(c) 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 Standardization Branch, ANM-113.

(d) 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.

(e) The inspections and modifications shall be done in accordance with the following Aerospatiale Corvette service bulletins, as applicable, which contain the specified effective pages:

Service Bulletin Referenced and Date

Page Number Revision Level Shown on Page Date Shown on Page Service Bulletin 53-21, June 25, 1990 1-9 Original June 25, 1990 Service Bulletin 53-22, July 20, 1990 1-13 Original July 20, 1990 Service Bulletin 53-23, Revision 2, November 6, 1991 1-5, 12-31

6-11 2

1 November 6, 1991

March 29, 1991 Service Bulletin 53-8, Revision 1, August 20, 19901-11 1 August 20, 1990

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 Aerospatiale, 316 Route de Bayonne, 31060 Toulouse, Cedex 03, France. 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.

(f) This amendment becomes effective on December 23, 1992.