AD 92-14-10

92-14-10 DE HAVILLAND, INC.: Amendment 39-8292. Docket No. 92-NM-32-AD. Supersedes AD 83-07-25, Amendment 39-4631.

Applicability: Model DHC-7 series airplanes; as listed in de Havilland Service Bulletin 7-27-46, Revision B, dated December 17, 1982, certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent inadvertent deployment of the ground spoilers and loss of lift, accomplish the following:

(a) Within 15 hours time-in-service or 7 days after April 25, 1983 (the effective date of AD 83-07-25, Amendment 39-4631), whichever occurs first, perform a functional check of the ground spoiler control system, in accordance with the Accomplishment Instructions of de Havilland Alert Service Bulletin 7-27-46, Revision A, dated November 19, 1982; or de Havilland Service Bulletin 7-27-46, Revision B, dated December 17, 1982.

(b) If the check required by paragraph (a) of this AD shows incorrect indications, operate theairplane in accordance with the Airplane Flight Manual Minimum Equipment List Supplement No. 4 until the requirements of paragraph (d) of this AD are accomplished.

(c) Repeat the functional checks required by paragraph (a) of this AD at intervals not to exceed 15 hours time-in-service, or 7 days, whichever occurs first.

(d) Within 6 months after the effective date of this AD, accomplish either paragraph (d)(1) or (d)(2) of this AD, as applicable, in accordance with de Havilland Service Bulletin 7-27- 46, Revision B, dated December 17, 1982:

(1) For airplanes having serial numbers 1 through 73, inclusive, that have been retrofitted with Modification No. 7/1732; and airplanes having serial numbers 74 through 83, inclusive, 85, 86, and 89: Incorporate Modification No. 7/2296, in accordance with the service bulletin.

(2) For airplanes having serial numbers 1 through 73, inclusive, that have not been retrofitted with Modification No. 7/1732; and airplanes having serial numbers 84, 87, 88, and 90 through 93, inclusive: Incorporate Modification No. 7/2294, in accordance with the service bulletin.

(e) Incorporation of Modification No. 7/2296 or 7/2294, as required by paragraph (d)(1) or (d)(2) of this AD, constitutes terminating action for the repetitive functional checks required by paragraph (c) of this AD.

(f) 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, New York Aircraft Certification Office (ACO), ANE-170, FAA, Engine and Propeller Directorate. Operators shall submit their requests through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, New York ACO.

NOTE: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the New York ACO.

(g) Special flight permits may be issuedin accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

(h) The functional checks and modifications shall be done in accordance with de Havilland Service Bulletin 7-27-46, Revision A, dated November 19, 1982; and de Havilland Service Bulletin 7-27-46, Revision B, dated December 17, 1982, which contains the following list of effective pages:

Page Number Revision Level Date 1-4 B December 17, 1982 5-7 A November 19, 1982

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 England Region, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, ValleyStream, New York; or at the Office of the Federal Register, 1100 L Street NW., Room 8401, Washington, DC.

(i) This amendment becomes effective on August 20, 1992.