AD 91-03-11

91-03-11 BRITISH AEROSPACE: Amendment 39-6873. Docket No. 90-NM-193-AD. Applicability: Model BAe 146 100A and 200A series airplanes, as listed in British Aerospace Service Bulletin 55-7-00955D, Revision 2, dated January 22, 1990, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent oscillations (flutter) of the elevators, accomplish the following:

A. Within 180 days after the effective date of this AD, install additional mass balance weights to the elevators forward of the hinge line, in accordance with British Aerospace Service Bulletin 55-7-00955D, Revision 2, dated January 22, 1990.

B. 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.

C. 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 (39-6873, AD 91-03-11) becomes effective on March 4, 1991.