[4910-13-PJ

DEPARTMENT OF TR<\J'ISPORTA nON Federal Aviation Administration 14CFR Part 39

Airworthiness Directives; The Boeing Company Model 737-300, -400, -500, -600, [Docket No. FAA-2010-0046j Directorate Identifier 2009-NM-086-AD; Amendmen 

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737-300, -400, -500, -600, -700, and -800 series airplanes. This AD requires inspecting 0 verify the part number ofthe low-pressure flex-hoses ofthe crew oxygen system install under the oxygen mask stowage boxes located within the flight deck, and replacing the -700, and -800 Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final mle. SUMlVV\.RY: We are adopting anew airwortHiness directive (AD) forcertain Model

flex-hose with anew non-conductive low-pressure flex-hose ifnecessary. This AD Al'E

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lATE The Director ofthe Federal Register approved the incorporation by reference of I certain publications listed inthe AD asof[I:NS'ERT DATE 35 DAYS AFTER DATE 

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# I results from reports oflow-pressure flex-hoseslofthe crew oxygen system that burned ~OUTI"G sn'.OL. through due toinadvertent electrical current fr01l1ashort circuit in the audio select pane. We are issuing this AD toprevent inadvertent llectTical current, which can cause the ,~LTIAI£'SJG low-pressure flex-hoses ofthe crew oxygen syltem tomelt orbum, causing oxygen

PUBLICATION INTHE FEDERAL REG1STER]. DATES: This AD is effective [INSERT DATE 35 DAYS AFTER DATE OF system leakage and smoke or fire.[491O-13-P]

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 ONCV"-RENCES OUnNC; S'MWL
'NmAl$lsrc [Docket No. FAA-2010-0046j Directorate Identifier 2009-NM-086-ADj Amendment 

### D m 39-**; AD **) RlN 2120-AA64 Ainvorthiness Directives; The Boeing Company Model 737-300, ·400, -500, -600, -700, and -800 Series Airplanes AGENCY: Federal Aviation Administration (Fr)' DOT. ACTION: Final rule. 

### SU.MMARY: We are adopting anew airworthiness directive (AD) for certain Model ROUTINe; SYM60L
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DATES: This AD is effective [INSERT DATE "5 DAYS AFTER DATE OF 737-300, -400, -500, -600, -700, and -800 series airplanes. This AD requires inspecting t verify the part number ofthe low-pressure flexMhoses ofthe crew oxygen system installe under the oxygen mask stowage boxes located 1ithin the flight deck, and replacing the m flex-hose with anew nOll-conductive low-pressure flex-hose ifnecessary. This AD (p

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# I I O~'C ~"eoc . results from reports oflow-pressure flex-hoses ofthe crew oxygen system that burned 

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# lS'A> ~ l-IO-IO We are issuing this AD to prevent inadvertent ete~trical current, which can cause the OUTING rMB?l ~~ low-pressure flex-hoses ofthe crew oxygen sys ill to melt orburn, causing oxygen 

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## ." c,( 0 OunNG sYMBOL PUBLICATION IN THE FEDERAL REGISTlfl 

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DEPARTMENT OF TRANSPORTATION Federal Aviation Administration ONCURREtlCE$ olin"" SYM80l 14CFR Part 39 FhJD'-\I mJnAL$/51G [Docket No. FAA-2010-0046; Directorate Identitier 2009-NM-086-AD; Amendmen~ 

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DATE 39-**; AD HI RlN 2120-AA64 Airworthiness Directives; The Boeing CompJy Model 737-300, -400, -500, -600, -700, and -800 Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ROUTlNG SYMBOl 

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## ~-is-ie OunNG SYMBOL ACTION: Final rule. SUMMARY: We are adopting anew airworthiness directive (AD) for certain Model OAn: ;" I I.>21 .;} 737-300, -400, -500, -600, -700, and -800 series airplanes. This AD requires inspecting t .0"" gS bu' verify the part lllUllber ofthe low-pressure flex-Joses ofthe crew oxygen system installe under the oxygen mask stowage hoxes located 1ithin the flight deck. and replacing the Me flex-hose wIth anew non-conductIve 

### Jow-pressle flex-hose Itnecessary. Thjs AD OlfTl;N~IS'r~B:L_( results from reports oflow-pressure flex-hoses ofthe crew oxygen system that burned 

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# !0 We are issuing this AD toprevent inadvertent electrical current, which can cause the I low-pressure flex-hoses 

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### Syst1mto melt orburn, causing oxygen system leakage and smoke orfire. DATES: This AD is effective [INSERT DATE 35 DAYS AFTER DATE OF I PUBLICATION IN THE FEDERAL REGISTEilThe Director ofthe Federal Register appro I ved the inc9rporation byreference of rillALSi51G 

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