AD/B747/349 Crew Oxygen Cylinder Support (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.

Boeing 747 Series Aeroplanes

AD/B747/349 Crew Oxygen Cylinder Support 8/2006

Applicability:	Model 747-400 series aircraft, as identified in Boeing Special Attention Service Bulletin 747-35-2114 original issue, or later FAA approved revision.
Requirement:	Action in accordance with the technical requirements of FAA AD 2006-12-10 Amdt 39-14635.
Compliance:	As specified in the Requirement document, with a revised effective date of 3 August 2006.
This Airworthiness Directive becomes effective on 3 August 2006.
Background:	The FAA received a report indicating that certain oxygen cylinder supports may not have been properly heat-treated.  The actions required by this Directive are intended to prevent failure of the oxygen cylinder support under the most critical flight load conditions, which could cause the oxygen cylinder to break loose and cause a loss of oxygen for the flight crew.  Also, a fire hazard could result from oxygen leakage.

David Villiers
Delegate of the Civil Aviation Safety Authority

21 June 2006