AD/AMD 50/47 Crew and Passenger Oxygen Lines (Cth)

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.001(1) of CASR 1998.  The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AMD Falcon 50 and 900 Series Aeroplanes

AD/AMD 50/47 Crew and Passenger Oxygen Lines 8/2009

Applicability:	Falcon 900EX aeroplanes with serial numbers listed in Table 1.
Table 1
120 121 122 123 124 125 126	127 129 132 134 135 136 137	139 140 141 143 144 145 147	151 153 155 158 159 163 165	168 169 170 172 173 174 178	183 192 194 196 197 199 206.
Requirement:	1.    Inspect the oxygen lines in accordance with Part 1 of the accomplishment instructions of Dassault Aviation Service Bulletin (SB) F900EX-347 initial issue dated 19 March 2009.
2.    If any interference or damage is found, replace the oxygen lines and install improved brackets in accordance with Part 2 of the accomplishment instructions of SB F900EX-347.
3.    Replace the oxygen line support assemblies in accordance with Part 2 of the accomplishment instructions of SB F900EX-347.
Later revisions of the above SB approved by the European Aviation Safety Agency (EASA) are acceptable for compliance with the requirements of this directive.
Note:  EASA AD 2009-0104 refers.
Compliance:	For Requirement 1 - Within two months after the effective date of this Directive.
For Requirement 2 - Before further flight following the Requirement 1 check.
For Requirement 3 - Within 72 months after the effective date of this Directive.
This Airworthiness Directive becomes effective on 30 July 2009.

Background:

A quality control inspection performed during completion of one Falcon 900EX aeroplane has shown that the crew and passenger Right-Hand (RH) oxygen lines may both interfere with the frame 8 of the aeroplane structure.  A subsequent design review of the oxygen lines routing has confirmed that, on certain aeroplanes, equipped with a 115 cu-ft oxygen cylinder in the RH mid-cabin, may have been installed in such a way as to cause interfere with the structure.  This condition, if not corrected, could lead to an oxygen leak.

As a result, this Directive requires inspection of the oxygen lines, replacement of any damaged lines and modification of their support assembly.

James Coyne
Delegate of the Civil Aviation Safety Authority

15 June 2009