AD 85-14-01

85-14-01 DASSAULT - BREGUET: Amendment 39-5090. Applies to Mystere-Falcon 50 airplanes, serial numbers as follows: 014, 026, 035, 038, 039, 041, 045, 051, 053, 059, 069, 079, 081, 086, 087, 099, 105, 108, 124, 125; certificated in all categories. Compliance required within 90 days from the effective date of this AD, unless previously accomplished.

To prevent a lanyard hang-up when the lanyard is pulled to initiate the flow of oxygen into the oxygen mask, accomplish the following:

A. Each passenger emergency oxygen mask presentation box not located on the fuselage vertical center line must be inspected for orientation. Accomplish by manually opening the presentation box cover lids and inspecting to ensure that the presentation boxes are installed with the oxygen inlet fitting in the side of the oxygen box in the inboard position (pointed toward the fuselage center line). Any box not installed with this orientation must be removed and reinstalled in such a way that it isrotated 180 degrees so that the inlet fitting is in the inboard position.

NOTE: AiResearch Aviation Service Bulletin No. 9.1 pertains to this subject.

B. Alternate inspections, modifications, or other actions which provide an acceptable level of safety may be used when approved by the Manager, Western Aircraft Certification Office, FAA, Northwest Mountain Region.

C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to ferry airplanes to a maintenance base in order to comply with the requirements of this AD.

All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to AiResearch Aviation, 4150 Donald Douglas Drive, Long Beach, California 90808. These documents also may be examined at FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or at the Western Aircraft Certification Office, 15000 Aviation Boulevard, Hawthorne, California.

This amendment becomes effective August 15, 1985.