91-03-14 BRITISH AEROSPACE: Amendment 39-6872. Docket No. 90-NM-197-AD.
Applicability: Model BAe 146 series airplanes with Serial Numbers E2133, E3134, E3135, E3137, E2139, E3141, E3142, E3145, E2148, E3151, and E3155; certificated in any category.
Compliance: Required as indicated, unless previously accomplished.
To detect cracks and prevent failure of the butt strap and reduced structural capability of the wings, accomplish the following:
A. Prior to the accumulations of 12,000 landings, or within 30 days after the effective date of this AD, whichever occurs later, perform a detailed visual inspection of the right and left wing outer butt straps at Rib 2 lower wing skin joint, in accordance with British Aerospace Service Bulletin 57-36, dated June 8, 1990. Repeat this inspection thereafter at intervals not to exceed 9,000 landings or 4-1/2 years since last inspection, whichever occurs first.
B. If cracks are found as a result of the inspection required by paragraph A. of this AD, prior to further flight, repair in a manner approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate.
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, 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, 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 British Aerospace, PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041-0414. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington.
This amendment (39-6872, AD 91-03-14) becomes effective on March 4, 1991.