AD 90-05-07

90-05-07 BRITISH AEROSPACE: Amendment 39-6526. Docket No. 89-NM-232-AD. Applicability: Model BAe 146-200A and -300A series airplanes, equipped with Modification HCM30107C and HCM30300A, as listed in British Aerospace Inspection Service Bulletin 25-A157, dated August 14, 1989, certificated in any category.

Compliance: Required within 30 days after the effective date of this AD, unless previously accomplished. To ensure unrestricted passage of air from above the cabin floor to below the floor in the event of rapid decompression, accomplish the following:

A. Inspect the cabin insulation bags between frames 19 to 26, and frames 32 to 40, inclusive, both left and right sides of the cabin, to ensure the lower edge of the insulation bag is 4 inches above the level of the floor structure, in accordance with British Aerospace Service Bulletin 25-A157, dated August 14, 1989.

1. If sufficient clearance is found, reassemble parts and return the airplane to service.2. If insufficient clearance is found, prior to further flight, modify the insulation bags by folding under the lower edge and securing the insulation bags, in accordance with the service bulletin.

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, Northwest Mountain Region.

NOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who will either concur or comment and then send it 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, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041. 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 (39-6526, AD 90-05-07) becomes effective on April 9, 1990.