93-22-09: Hydraulic Selector Valves

93-22-09 JETSTREAM AIRCRAFT LIMITED (formerly British Aerospace): Amendment 39-8733. Docket 93-NM-57-AD. Applicability: All Model ATP airplanes, certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent a gear-up landing, accomplish the following: (a) Within 3,375 landings after the effective date of this AD, remove the hydraulic selector valves, part numbers AIR44880-5 and AIR44882-6, and install new, improved hydraulic selector valves, part numbers AIR46658-0 or AIR46660-0, as appropriate, in the emergency extension system for the landing gear, in accordance with AP Precision Hydraulics, Ltd., Service Bulletin AIR44880-29-02, Revision 1, dated March 9, 1993. (b) 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. (c) 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. (d) The removal and installation shall be done in accordance with AP Precision Hydraulics, Ltd., Service Bulletin AIR44880-29-02, Revision 1, dated March 9, 1993, which contains the specified effective pages: Page Number Revision Level Shown on Page Date Shown on Page 1 1 March 9, 1993 2 Original January 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 Jetstream Aircraft, Inc., P.O. Box 16029, Dulles International Airport, Washington, DC 20041-6029. 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. (e) This amendment becomes effective on December 16, 1993.