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DEPARTMENT OF TRANSPORTATION Federal Aviation Administration

RIN 2120-AA64 Airworthiness Directives; The Boeing Company Model 747- tOO,747-1OOB, 

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## //IZ/ ' ~OtmNGS\,MIlOL 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, " 747-400F, 747SR, and 747SP Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. SUMMARY: We are adopting anew airworthiness directive (AD) forcertain Model 7 airplanes. This AD requires inspecting loverify the part number orthe low-pressure flex-hoses ofthe crew oxygen system installed under the oxygen mask stowage boxes il the flight deck, and replacing the flex-hose with anew non-conductive low-pressure



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PUBLICATION INTHE FEDERAL REGISTER]. current, which can cause the low-pressure flex-hoses ofIhe crew oxygen system to me crew oxygen system that burned through due tO

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DATES: This AD iseffcctive [INSERT DATE 35 DAYS AFTER DATE OF[491O-13-P]

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 

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flex-hose ifnecessary. This AD results from reports aflaw-pressure flex-hoses ofthe &/'6 OUTING SYMBOL 

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DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39 (Docket No. FAA-2010-0045j Directorate Identifier 2009-NM-085-AD; Amendmen 39-**; AD **) RlN 2120-AA64 Ainvorthincss Directives; The Boeing Company Model 747-100, 747-1DaB, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR, and 747SP Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. SUMMARY: We are adopting anew airworthiness directive (AD) 

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