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[4910-13-P]

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration



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# c.~ v(r1 10 ovnHGSV!'160L OVll,HG SYMIlOl. ,. 

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. tlmAL.S!SIG flex-hoses ofthe fligbtcrew and supernumerary oxygen system installed under the 

## fuJl¥k(OO oxygen mask stowage box ataflightcrew and supernumerary oxygen mask location, ant

# ,N~);....-......-- replacing with anew non-conductive low-pressure flex-hose ofthe oxygen system if AlE 

### J_ b Ie) necessary. This AD results from reports of alow-pressure flex-hose ofaflightcrew oxygen system that burned through due to inadvertent electrical current from ashort circuit in an adjacent audio select panel. We are issuing this AD toprevent inadvertent electrical current, which can cause the low-pressure flex-hose of aflightcrew or airplanes. This AD requires inspecting to verify the part number ofthe low-pressure AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. Airworthiness Directives; The Boeing Company Model 757 Airplanes



### SUMMARY: We are adopting anew airworthiness directive (AD) for certain Model? [Docket No. FAA-2009-0795; Directorate Identifier 2009-NM-083-AD; Amendmen' 

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# 10/0-0&-/7 RIN 2120-AA64 14 CFR Part 39

f supernumerary oxygen system to melt orburn, resulting inoxygen system leakage and

smoke or fire. DATES: This AD is effective [INSERT DATE 35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. 

## , The Director ofthe Federal Register approved the incorporation by reference of ~ ATE certain publications listed inthe AD as of [INSERT DATE 35 DAYS AFTER DATE

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, OI11ltlG S'tM6OL PUBLICATION IN THE FEDERAL REGISTER]. ADDRESSES: For service information identified in this AD, contact Boeing14910-13-PI

DEPARTMENT OF TRANSPORT ATION Federal Aviation Administration 14CFR Part 39 [Docket No. FAA-2009-0795; Directorate Identifier 2009-NM-083-AD; Amcndmen

_39·**; AD 

## **1 RIN 2120-AA64 Airworthiness Directives; The Boeing Company Model 757 Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. SUMMARY: We are adopting anew airworthiness directive (AD) forcertain Model 7



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## ,,,,- airplanes. This AD requires inspectffig toverify the part number ofthe low-pressure flex-hoses ofthe flightcrew and supernumerary oxygen system installed under the



## " Al)ill-toO oxygen mask stowage box ataflightcrew and supernumerary oxygen mask location, an "nw.s.'SIG

nl(.ll.+ replacmg with anew non-conductive low-pressure flex-hose ofthe oxygen system if necessary. This AD results from reports of alow-pressure flex-hose ofaflightcrew oxygen system that burned through due to inadvertent electrical current from a short circuit inan adjacent audio select paneL We arc issuing this AD toprevent inadvertent electrical current which can cause the low-pressure flex-hose ofa flightcrew or supernumerary oxygen system tomelt or bum, resulting in oxygen system leakage and smoke or fire. DATES: This AD iseffective [INSERT DATE 35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. NrTlALSi'SIG The Director ofthe Federal Register approved the incorporation by reference of certain publications listed inthe AD as of [INSERT DATE 35 DAYS AFTER DATE 

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- PUBLICATION IN THE FEDERAL REGISTER]. ADDRESSES: For service infonnation identified inthis AD, contact Boeing NmAL5,IS1G



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