84-20-05: Landing Gear and Brakes

84-20-05 BRITISH AEROSPACE: Amendment 39-4910. Applies to Model DH/HS/BH 125 airplanes, series and serial numbers listed in the Planning Information section of the service bulletins referenced below, certificated in all categories. Compliance is required as indicated, unless previously accomplished. To prevent landing gear and brake failure, within the next 90 days after the effective date of this AD, accomplish the following: A. Incorporate British Aerospace modification No. 251714 to the landing gear emergency selector shaft assembly in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-59-(1714), Revision 3, dated June 23, 1983. B. Replace the knife edges of the brake control valves that have been overhauled by Dunlop Aviation Incorporated (California), with new parts in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-193, Revision 1, dated July 26, 1983. C. Inspect the main landing gear jacks forcracks, and replace the jacks if necessary, in accordance with the instructions of British Aerospace HS 125 Service Bulletin 32-A197, dated August 29, 1983. D. Alternate means of compliance which provide an equivalent level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region. E. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD. This amendment becomes effective October 14, 1984.