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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administ.-atioD

14 CFR Part 39 ;;L'010 _()O'-f(P

IDocket No. FAA-~+++++; Directorate Identifier 2009-NM-086-AD)

R1N 212o-AA64

Airworthiness Directives; Boeing Model 737-300, -400, -500, -600, -700, and -800 Series

Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Boeing

Model 737-300, -400, -500, -600, -700, and -800 series airplanes. This proposed AD would

require inspecting to verify the part number of the low-pressure flex-hoses of the crew

oxygen system installed under the oxygen mask stowage boxes located within the flight

deck, and replacing with a new non-conductive Jow-pressure flex-hose of the crew oxygen

system ifnecessary. This proposed AD results from reports oflow-pressure flex-hoses of the

crew oxygen system that burned through due to inadvertent electrical current from a short

circuit in the audio select panel. We are proposing this AD to prevent inadvertent electrical

current which can cause the low-pressure flex-hoses of the crew oxygen system to melt or

bum, causing oxygen system leakage and smoke or fire.

DATES: We must receive comments on this proposed AD by [insert date 45 days after date

ofpublicatiou in the FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:

9 Federal eRulcmaking Portal: Go to http://www.regulations.eo\'. Follow the

instructions for submitting comments.

• Fax: 202-493-2251.

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DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

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14 CFR Part 39

[Docket No. FAA-2009- I I I I I; Directorate Identifier 2009-NM-086-AD]

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Boeing Model 737-300, -400, -500, -600, -700, and -800 series airplanes. This proposed DATE/ /

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AD would require inspecting to verify the part number of the low-pressure flex-hoses 0 "'I"'l SymIl<II

SUMMARY: We propose to adopt a new ainvorthincss directive (AD) for cert~in

AGENCY: Federal Aviation Administration (FAA), DOT

ACTION: Notice of proposed rulemaking (J\TPRM).

RlN 2120-AA64

Airworthiness Directives; Boeing Model 737-300, -400, -500, -600, -700, and -800

Series Airplanes

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the crew oxygen system installed under the oxygen mask stowage boxes located within

the flight deck., and replacing with a new non-conductive low-pressure flex-hose of the

crew oxygen system if necessary. Tills proposed AD results from reports of low-pres sur

flex-hoses of the crew oxygen system that burned through due to inadvertent electrical

current from a short circuit in the audio select panel. We are proposing this AD to preve

inadvertent electrical current which can cause the low-pressure flex-hoses of the crew

oxygen system to melt or bum, causing oxygen system leakage and smoke or ftre.

DATES: We must receive comments on this proposed AD by [insert date 45 days after

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date of publication in the FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:

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It Federal eRulemaking Portal: Go to http://www.regulations.gov.Foliowthe

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instructions for submitting comments. f,

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• Fax: 202-493-2251.

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39 A1Jm-1i .

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(Docket No. FAA-2009-1 I I I ,; Directorate Identifier 2009-NM--086-AD)

RIN 2120-AA64

Ainvorthiness Directives; Boeing Model 737-300, -400, -500. -600, ~700. and -800

AGENCY: Federal Aviation Administration (FAA), DOT.

Series Airplanes

ACTION: Nolice of proposed rulemaking (NPRM).

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Boeing Model 737-300, -400, -500, -600, -700, and -800 series airplanes. This proposed ';"i /

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AD would require inspecting to verify the part number of the low-pressure flex-hoses 0 Q"'~QSl"""'"

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain

the crew oxygen system installed under the oxygen mask stowage boxes located within

the flight deck, and replacing with a new non-conductive low-pressure flex-hose of the

crew oxygen system if necessary. This proposed AD results from reports of low-pres sur

flex-hoses of the crew oxygen system that burned through due to inadvertent electrical

current from a short circuit in the audio select panel. We are proposing this AD to preve

inadvertent electrical current which can cause the low~pressure f1ex~hoses of the crew

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oxygen system to melt or bum, causing oxygen system leakage and smoke or fire.

DATES: We must receive comments on this proposed AD by [insert date 45 days after .~

date ofpubJieation in the FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:

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e Federal eRulemaking Portal: Go to hnp:l/www.regulations.gov. Follow the

instructions for submitting comments. ''-

• fax: 202-493-225 L

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