86-24-08 BRITISH AEROSPACE (BAe): Amendment 39-5476. Applies to Model 3101 Jetstream (Serial Numbers 601, 603, 604, 606 to 610, 614, 620, 622, 624 to 626, 628 to 632, 634 to 636, and 638 to 653 inclusive) airplanes certificated in any category.
Compliance: Required within the next 200 hours time-in-service after the effective date of this AD, unless already accomplished.
To ensure that adequate lighting supply to the standby artificial horizon and altitude alert controller indicator (if fitted) is maintained during loss of the main busbar supply, accomplish the following:
(a) Incorporate British Aerospace (BAe) modification JM7490 in accordance with the "Accomplishment Instructions" contained in BAe Alert Service Bulletin No. 24-A-JM7490 dated October 30, 1985, Revision No. 1 dated July 22, 1986, by changing the electrical supply source for the right upper center panel instrument lighting converter unit (1LH9) from the 28V d.c. main busbar to the 28V d.c. essential busbar.
(b) Aircraft may be flown in accordance with Federal Aviation Regulations 21.197 to a location where this AD can be accomplished.
(c) An equivalent means of compliance with this AD may be used if approved by the Manager, Aircraft Certification Staff, AEU-100, Europe, Africa and Middle East Office, FAA c/o American Embassy, 1000 Brussels, Belgium.
All persons affected by this directive may obtain copies of the document referred to herein upon request to British Aerospace, Engineering Department, Post Office Box 17414, Dulles International Airport, Washington, D.C. 20041; Telephone (703) 435-9100; or FAA, Office of the Regional Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106.
This amendment becomes effective on January 7, 1987.