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DEPARTMENT OF TRANSPORT ATlON
14CFR Part 39 Federal Aviation Administration



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# I [Docket No. FAA-2010-++++; Directorate Identifier 20l0-NM-069-AD) RIN 2120-AA64 Ainvorthiness Directives; The Boeing Company Model 737~100, -200, ~200C, -300, ADO, and -500 Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt anew airworthiness directive (AD) for certain Mod 737-100, -200, -200C, -300: -400, and -500 series airplanes. This proposed AD would require installing two warning level indicator lights onthe P2-2 center instrument panel inthe flight compartment for certain airplanes. For acertain other airplane, this propose AD would require activating the cabin altitude warning and takeoff configuration warning lights. For all airplanes, this proposed AD also would require revising the UTlNG SVtlllOl

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cabin altitude warning system that would address the identified unsafe condition. We ar

DATES: We must receive comments on this priPosed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. airplane flight manual to remove certain requirements included by previous AD actions" f)'\

### -1uOS I I A ISle; to require new pressure altitude limitations for certain airplanes, and to advise the 

# I ~E flightcrew oftilefollowing changes: revised 

### emyf!5cncy procedures to use when acabin 

# G wild I OUnNG S1'f'IfIOL altitude warning orrapid depressurization occurs, and revised cabin pressurization
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# 7 I "mAt.SISl(' procedures fornormal operations. This proposed AD results from adesign change in the 

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~~ proposing this AD to prevent failure ofthe flightcrew to recognize and react to avalid .- 

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., 'JJ' cabin altitude warning horn, which could result in incapacitation ofthe flightcrew due to /j'~ hypoxia (lack ofoxygen inbody), and consequent loss ofcontrol ofthe airplane. 

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DEPARTMENT OF TRANSPORTATION Federal Aviation Administration otICURIlEtlCfS. OUTING SVM60l



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# A,,",,'13 s 14CFR Part 39 [Docket No. FAA-2010-++++; Directorate Identifier 2010-NM-069-AD] RlN 2I20-AA64 Ainvorthiness Directives; The Boeing Company Model 737-100, -200, -20De, -300, -400, and -500 Series Airplanes AGENCY: Federal Aviation Administration (EM), DOT. ACTION: Notice ofproposed ruleroaking (NPRM). 

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- inthe flight compartment for certain aiIplanes. For acertain other airplane, this propose ~ !'G require installing two warning level indicator lights onthe P2-2 center Instrument panel SUMMARY: We propose to adopt anew airworthiness directive (AD) for certain Mod 737-100, -200, -200C, -300; -400, and -500 series airplanes. This proposed AD would

AD would require activating the cabin altitude warning andtakeoff configuration warning lights. For all airplanes, this proposed AD also would require revising the 

# vii. airplane flight manual to remove certain requirements included by previous AD actions, I NITIlILSlS1G torequire new pressure altitude limitations for certain airplanes, and toadvise the 

# -===f-. I ,~ flightcrew ofthe following changes: revised emergency procedures to use when acabin I· altitude warning orrapid depressurization occurs, and revised cabin pressurization procedures fornormal operations. This proposed AD results from adesign change in the , .:§

cabin altitude warning system that would address the identified unsafe condition. We ar 

## 7, Z-/ 10 O\1T1NG SYHBOI. proposing this AD to prevent failure ofthe flightcrew torecognize and react to avalid 

# I() I cabin altitude warning horn, which could result in incapacitation ofthe flightcrew du· hypoxia (lack ofoxygen inbody), and cqnsequeJt loss ofco~rol ofthe airplane. DATES: We must receive comments onthis pro~osed AD by [INSERT DATE 45
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OVllNG SYl-'IlOL DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].