DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2008-0410; Directorate Identifier 2007-NM-362-AD;
Amendment 39-15485; AD 2006-12-10 R1]
RIN 2120-AA64
Airworthiness Directives; Boeing Model 747-400 Series Airplanes
Preamble Information
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule; request for comments.
SUMMARY: The FAA is revising an existing airworthiness directive (AD) that applies to certain Boeing Model 747-400 series airplanes. That AD currently 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 new AD retains all the requirements of the existing AD and expands the applicability of the existing AD to include certain airplanes that are not on the U.S. Register. 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.
DATES: Effective May 7, 2008.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in the AD as of May 7, 2008.
On July 17, 2006 (71 FR 33604, June 12, 2006), the Director of the Federal Register approved the incorporation by reference of Boeing Special Attention Service Bulletin 747-35-2114, dated December 19, 2002.