93-15-07 DE HAVILLAND, INC.: Amendment 39-8653. Docket 93-NM-124-AD.
Applicability: All Model DHC-7 series airplanes, certificated in any category.
Compliance: Required as indicated, unless accomplished previously.
To prevent failure of the upper lockstrut sub-assembly, which could lead to partial collapse of the main landing gear, accomplish the following:
(a) Within 250 landings after the effective date of this AD, conduct a non-destructive testing inspection of upper lockstrut sub-assemblies, part numbers 15709-7 and 15709-9, to detect cracking, in accordance with de Havilland Alert Service Bulletin S.B. A7-32-100, dated July 7, 1993.
(1) If any crack is detected, prior to further flight, replace the discrepant sub-assembly with a serviceable sub-assembly in accordance with the service bulletin.
(2) If no crack is detected, no further action is required by this AD.
(b) Within 5 days after completion of the inspection required by paragraph(a) of this AD, operators must submit a report containing details of any cracked upper lockstruts found to de Havilland, Inc., Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada; fax (416) 375-4539. Information collection requirements contained in this regulation have been approved by the Office of Management and Budget (OMB) under the provisions of the Paperwork Reduction Act of 1980 (44 U.S.C. 3501 et seq.) and have been assigned OMB Control Number 2120-0056.
(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), 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, ifany, 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 inspection and replacement shall be done in accordance with de Havilland Alert Service Bulletin S.B. A7-32-100, dated July 7, 1993. 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, Engine and Propeller Directorate, New York Aircraft Certification Office, 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 amendmentbecomes effective on August 9, 1993.