93-11-09 DE HAVILLAND, INC.: Amendment 39-8599. Docket 92-NM-205-AD.
Applicability: All Model DHC-7 series airplanes, certificated in any category.
Compliance: Required as indicated, unless accomplished previously.
To prevent degradation of the structural capabilities of the affected airplanes, accomplish the following:
(a) For all affected airplanes: Within 6 months after the effective date of this AD, replace the six MS rivets with hi-strength Hi-Lok fasteners, Modification 7/2572, in the drag strut attachment fitting of the nose landing gear, in accordance with de Havilland Service Bulletin S.B. 7-53-32, dated March 15, 1991.
(b) For airplanes having serial numbers 3 through 27, inclusive: Installation of a new outer drag strut attachment fitting, Modification 7/1328, in accordance with de Havilland Service Bulletin 7-53-31, dated December 15, 1989, as revised by Notice of Status Change 7-53-31-1, dated April 20, 1990, constitutes an acceptable alternative method of compliance with the requirements of this AD.
(c) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, New York Aircraft Certification Office (ACO), ANE-170, FAA, Engine and Propeller Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO.
NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York ACO.
(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 replacement shall be done in accordance with de Havilland Service Bulletin S.B. 7-53-32, dated March 15, 1991. The installation shall be done in accordance withde Havilland Service Bulletin 7-53-31, dated December 15, 1989; and Notice of Status Change 7-53-31-1, dated April 20, 1990, for de Havilland Service Bulletin 7-53-51, dated December 15, 1989. 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 de Havilland, Inc., Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, New York Aircraft Certification Office, Engine and Propeller Directorate, 181 South Franklin Avenue, Room 202, Valley Stream, New York; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
(f) This amendment becomes effective on July 22, 1993.