83-26-02 BRITISH AEROSPACE: Amendment 39-4788. Applies to all Model BAC 1- 11 200 and 400 series airplanes certificated in all categories. Compliance is required as indicated. To assure detection of improperly closed doors and prevent the forward passenger or forward service door from opening during flight, accomplish the following, unless already accomplished:
A. Within 9 months after the effective date of this AD, install an auxiliary forward passenger and forward service door status warning system in accordance with paragraph 2, "Accomplishment Instructions," of British Aerospace Service Bulletin 52-PM3329 Part 2, Revision No. 2, dated November 12, 1980.
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 January 30, 1984.