90-16-03 AEROSPATIALE: Amendment 39-6681. Docket No. 90-NM-51-AD.
Applicability: All Model Corvette SN 601 series airplanes that have not incorporated Modification No. 1397, certificated in any category.
Compliance: Required as indicated, unless previously accomplished.
To prevent reduced structural integrity of the fuselage, accomplish the following:
A. Prior to the accumulation of 9,800 landings or within 100 landings after the effective date of this AD, whichever occurs later, perform a high frequency eddy current inspection of the left-hand inner beam between Frame 16 and Frame 20, in accordance with Corvette SN 601 Service Bulletin, 53-18, Revision 1, dated January 22, 1990.
B. If no cracks are found, repeat the inspection required by paragraph A., above, at intervals not to exceed 3,900 landings.
C. If cracks are found, modify prior to further flight, in accordance with Corvette SN 601 Service Bulletin 53-11, Revision 2, dated January 15, 1990. Incorporation of this modification (No. 1397) constitutes terminating action for the repetitive inspections required by paragraph B., above.
D. Within one year after the effective date of this AD, replace all left-hand inner beam stiffeners between Frame 16 and Frame 20, in accordance with Corvette SN 601 Service Bulletin 53-11, Revision 2, dated January 15, 1990. Incorporation of this modification (No. 1397) constitutes terminating action for the repetitive inspections required by paragraph B., above.
E. 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, Transport Airplane Directorate.
NOTE: The request should be submitted directly to the Manager, Standardization Branch, ANM-113, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Manager, StandardizationBranch, ANM-113.
F. 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 Aerospatiale, 316 Route de Bayonne, 31060 Toulouse, Cedex 03, France. 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.
This amendment (39-6681, AD 90-16-03) becomes effective on August 31, 1990.