92-11-05 BRITISH AEROSPACE: Amendment 39-8255. Docket No. 91-NM-281-AD.
Applicability: Viscount Model 744 and 745D series airplanes, post-mod D3070 and D3292; and Viscount Model 810 series airplanes, post-mod FG1925 and FG2172, certificated in any category.
Compliance: Required as indicated, unless accomplished previously.
To prevent reduced structural integrity of the engine mount attachment to the wing and wing structure, accomplish the following:
(a) Within 100 landings or within 4 months after the effective date of this AD, whichever occurs earlier, visually inspect the upper boom of the wing rib at wing station 257, left and right, for proper fastener edge distance, in accordance with British Aerospace Viscount Alert Preliminary Technical Leaflet (PTL) 192 or PTL 323, both dated January 31, 1990, as applicable.
(b) If any discrepancies are detected in the fastener edge distance, prior to further flight, replace the rib boom with a new part, or repair in a manner approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate.
(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. The request shall 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 the airplane to a location where the requirements of this AD can be accomplished.
(e) The inspection and replacement shall be done in accordance with British Aerospace Viscount Alert PTL 192, Issue 1, dated January 31, 1990; or British Aerospace Viscount Alert PTL 323, Issue 1, dated January 31, 1990; as applicable. (NOTE: The issue date of PTL 192 and PTL 323 is indicated only on "page 3 of 5" of each document; no other page of these documents is dated.) This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from British Aerospace, PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041-0414. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington; or at the Office of the Federal Register, 1100 L Street NW., Room 8401, Washington, DC.
(f) This amendment becomes effective on July 9, 1992.