AD 90-20-07

90-20-07 BRITISH AEROSPACE: Amendment 39-6729. Docket No. 90-NM-102-AD.

Applicability: Model BAC 1-11 200 and 400 series airplanes, certificated in any category.

Compliance: Required within 30 days after the effective date of this AD, unless previously accomplished.

To provide auxiliary power unit (APU) air intake plenum overheat detection, accomplish the following:

A. Install temperature sensors in the APU air intake plenum, in accordance with British Aerospace Alert Service Bulletin 49-A-PM5955, Issue 1, dated April 13, 1988.

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 (39-6729, AD 90-20-07) becomes effective on October 23, 1990.