AD 93-13-06

93-13-06 SHORT BROTHERS, PLC: Amendment 39-8619. Docket 92-NM-176-AD. Applicability: Model SD3-60 series airplanes; equipped with main landing gear (MLG) actuator part number (P/N) 104796004, having serial number DRG/4729/86, DRG/4730/86, DRG/5057/86, DRG/5059/86, DRG/5060/86, or DRG/5061/86; certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent failure of the MLG actuator to unlock, which would prevent the extension of the MLG, accomplish the following:

(a) Within 6 months after the effective date of this AD, replace the MLG actuator with a serviceable actuator that is marked "32-69SD" in accordance with Dowty Aerospace Hydraulics - Cheltenham Service Bulletin 32-69SD, Revision 2, dated January 20, 1993.

(b) As of the effective date of this AD, no person shall install on any airplane a MLG actuator P/N 104796004, having serial number DRG/4729/86, DRG/4730/86, DRG/5057/86, DRG/5059/86, DRG/5060/86, or DRG/5061/86, that is not marked "32-69SD."

(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, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Standardization Branch, ANM-113.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the 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 replacement shall be done in accordance with Dowty Aerospace Hydraulics - Cheltenham Service Bulletin 32-69SD, Revision 2, dated January 20, 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 Short Brothers, PLC, 2011 Crystal Drive, suite 713, Arlington, Virginia 22202-3719. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC.

(f) This amendment becomes effective on August 18, 1993.