Airworthiness Directive · Amendment 39-14635 · Boeing Model 747-400 Series Airplanes
Boeing Model 747-400 Series Airplanes
Superseded. A later AD replaced this one: AD 2006-12-10 R1. Comply with the one in force.
This AD applies to Boeing Model 747-400 series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002.
The FAA is adopting a new airworthiness directive (AD) for certain Boeing Model 747-400 series airplanes. This AD requires inspecting the support bracket of the crew oxygen cylinder installation to determine the manufacturing date marked on the support, and performing corrective action if necessary. This AD results from a report indicating that certain oxygen cylinder supports may not have been properly heat-treated. We are issuing this AD to prevent failure of the oxygen cylinder support under the most critical flight load conditions, which could cause the oxygen cylinder to come loose and leak oxygen. Leakage of oxygen could result in oxygen being unavailable for the flightcrew or could result in a fire hazard in the vicinity of the leakage.
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 18 months after the effective date of this AD, except as provided by paragraph (g) of this AD: Inspect the support bracket of the crew oxygen cylinder installation to determine the manufacturing date marked on the support, and do the corrective action as applicable, by doing all of the actions in accordance with the Accomplishment Instructions of Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002. Corrective action, if applicable, must be done before further flight after the inspection.
(g) If the configuration of the crew oxygen cylinder installation is changed from a one-cylinder to a two-cylinder configuration: Do the actions required by paragraph (f) of this AD before further flight after the change in configuration, or within 18 months after the effective date of this AD, whichever is later.
On or after the effective date of this AD, no person may install an oxygen cylinder support bracket having part number 65B68258-2 and having a manufacturing date between 10/01/98 and 03/09/01 inclusive (meaning, a manufacturing date of 10/01/98 or later and 03/09/01 or earlier).
