87-12-03 BRITISH AEROSPACE: Amendment 39-5634. Applies to BAC Model 1-11 Series 200 and 400 airplanes, certificated in any category. Compliance is required within 90 days after the effective date of this AD.
To prevent loss of pressurization as a result of conducting the procedures for electrical smoke or fire, accomplish the following, unless previously accomplished.
A. Modify the Airplane Flight Manual and notify flight crews as follows. This may be accomplished by inserting a copy of this AD in the Airplane Flight Manual.
1. In Section 3, Page 12A, add:
"In the event that the procedure for electrical smoke or fire has to be carried out when both pneumatic and both air conditioning systems are operative, the subsequent busbar switching actions will result in the loss of one air conditioning system. Therefore, reduce aircraft altitude to 25,000 feet or below, as soon as practicable."
2. In Section 3, Page 12A, add:
"In the event that the procedure for electrical smoke or fire has to be carried out with either pneumatic or either air conditioning system inoperative, reduce aircraft altitude to 15,000 feet or below, as soon as practicable, and open the ram air valve."
3. In Section 4, Page 49, add:
"Should a pneumatic or an air conditioning system fail above 25,000 feet, reduce aircraft altitude to 25,000 feet or below, as soon as practicable."
B. The limitation defined in paragraph A.2., above, may be removed after BAe Modification 21-PM5930 to the electrical system is incorporated.
C. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM-113, FAA, Northwest Mountain Region.
D. 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 the modifications required by this AD.
All persons affected by this directive who have not already received the appropriate service document from the manufacturer may obtain copies upon request to British Aerospace, Inc., Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041. This document may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification office, 9010 East Marginal Way South, Seattle, Washington.
This amendment becomes effective July 6, 1987.