AD 84-03-03

84-03-03 BRITISH AEROSPACE: Amendment 39-4812. Applies to Model HS 125 airplanes series 1A with modifications 251867 and 252605, series 400A with modification 252550, series 600A with modification 252468, and series 700A, certificated in all categories. The serial numbers of the affected airplanes are listed in the Planning Information section of British Aerospace 125 series Service Bulletin 24-225-(2747), dated October 17, 1980. Compliance is required as indicated, unless already accomplished.

To prevent loss of power to both engine fuel computers by a single fuse failure, accomplish the following:

A. Modify the engine fuel computers' direct current power supply electrical circuits within the next 500 hours time in service or one year, whichever occurs first after the effective date of this AD, in accordance with paragraph 2, Accomplishment Instructions, of British Aerospace, HS 125 series Service Bulletin 24-225-(2747), dated October 17, 1980.

B. Alternate means ofcompliance 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 March 22, 1984.