84-07-01 SHORT BROTHERS LTD: Amendment 39-4835. Applies to SD3-60 airplanes as listed in Short Brothers Service Bulletin SD360-55-02, dated November 1983, certificated in all categories. Compliance is required as indicated unless previously accomplished. To prevent vibration in the event of an elevator tab drive system failure, accomplish the following:
A. Within 60 days after the effective date of this AD, modify the elevator and elevator tab mass balance weights in accordance with Short Brothers Ltd. Service Bulletin SD360- 55-02 dated November 1983.
B. 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.
C. 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 April 9, 1984.