Airworthiness Directive · Amendment 39-17140 · Oxygen
Dassault Aviation Airplanes
This AD applies to Dassault Aviation Model FALCON 7X airplanes, certificated in any category, serial numbers 3, 10, 13, 18, 19, 20, 22, 23, 24, 26, 27, 29, 30, 31, 32, 33, 35, 36, 38, 41, 42, 43, 47, 48, 58, 63, 64, 66, 67, 68, 71, 76, 78, 79, 83, 84, 85, 86, 87, and 93; except for airplanes on which the Dassault Aviation modification specified in Dassault Mandatory Service Bulletin 7X-174 has been incorporated.
We are adopting a new airworthiness directive (AD) for certain Dassault Aviation Model FALCON 7X airplanes. This AD was prompted by a report that a passenger oxygen pipe at frame 10 was chafing against the forward lavatory rear structure, raising the risk of the oxygen pipe developing a crack. This AD requires modifying the routing of and, if necessary, replacing, the oxygen pipe. We are issuing this AD to prevent rupture of the oxygen pipe which, in case of a cabin depressurization, would impair operation of the passenger oxygen distribution system.
You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done.
Within 2 months after the effective date of this AD, do a boroscope inspection of the passenger oxygen pipe for clearance and a general visual inspection for damage of the oxygen pipe, in accordance with the Accomplishment Instructions of Dassault Mandatory Service Bulletin 7X-174, dated March 10, 2011.
If during any inspection required by paragraph (g) of this AD any damage is found or oxygen pipe clearance is less than 3 millimeters (mm) (0.12 inch): Before further flight, modify the oxygen pipe routing, including doing a general visual inspection for chafing of the pipe and doing all applicable replacements, in accordance with the Accomplishment Instructions of Dassault Mandatory Service Bulletin 7X-174, dated March 10, 2011.
If, during any inspection required by paragraph (g) of this AD, oxygen pipe clearance is 3 mm (0.12 inch) or more but less than 12 mm (0.47 inch): Within 98 months or 4,000 flight cycles after the effective date of this AD, whichever occurs first, modify the routing of the passenger oxygen pipe, including doing a general visual inspection for chafing of the pipe and doing all applicable replacements, in accordance with the Accomplishment Instructions of Dassault Mandatory Service Bulletin 7X-174, dated March 10, 2011.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
