AD 91-04-07

91-04-07 BRITISH AEROSPACE: Amendment 39-6899. Docket No. 90-NM-230-AD. Applicability: Model BAe 146-100A, -200A, and -300A series airplanes, as listed in British Aerospace Service Bulletin 24-69-70484A, Revision 1, dated July 25, 1990, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent loss of all AC electrical power, accomplish the following:

A. Within 90 days after the effective date of this AD, in the AC powered hydraulic pump electric power circuit, remove the remote controlled circuit breaker (RCCB), Part Number SM601BA40A12 or SM601BA40A13, and replace it with a modified RCCB, Part Number SM601BA40A14, in accordance with British Aerospace Service Bulletin 24-69-70484A, Revision 1, dated July 25, 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 (39-6899, AD 91-04-07) becomes effective on March 22, 1991.