AD 91-11-12

91-11-12 BRITISH AEROSPACE: Amendment 39-7010. Docket No. 91-NM-16-AD. Applicability: All Viscount Model 810 series airplanes, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent in-flight separation of an entrance or emergency door from the airplane and subsequent decompression of the passenger cabin, accomplish the following:

A. Within 90 days after the effective date of this AD, perform a non-destructive testing (NDT) X-ray inspection of the forward passenger door, and of the rear entrance and rear emergency doors, for incorrectly machined door operating torque shaft coupling sleeves, in accordance with Viscount Preliminary Technical Leaflet (PTL) No. 194, Revision 1, dated December 1989.

B. If incorrectly machined door operating torque shaft coupling sleeves are found, prior to further flight, replace the sleeves with correctly machined serviceable parts in accordance with Viscount PTL No. 194, Revision 1, dated December 1989.

C. An alternative method 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 forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it 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 (39-7010, AD 91-11-12) becomes effective on July 1, 1991.