[4910-13-P)

DEPARTMENT OF TRANSPORT ATlON

14 CFR Part 39

Federal Aviation Administration

Ol<O 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 of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new 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 on the P2-2 center instrument panel

in the flight compartment for certain airplanes. For a certain 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

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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 IN THE FEDERAL REGISTER].

airplane flight manual to remove certain requirements included by previous AD actions" f)'\ -1uOS

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to require new pressure altitude limitations for certain airplanes, and to advise the I ~E

flightcrew of tile following changes: revised emyf!5cncy procedures to use when a cabin G wild I OUnNG S1'f'IfIOL

altitude warning or rapid depressurization occurs, and revised cabin pressurization - 7

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procedures for normal operations. This proposed AD results from a design change in the C. ~

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proposing this AD to prevent failure of the flightcrew to recognize and react to a valid .- /01

., 'JJ' cabin altitude warning horn, which could result in incapacitation of the flightcrew due to /j'~

hypoxia (lack of oxygen in body), and consequent loss of control of the airplane. rlZ4-//0

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14910-13-Pj

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration otICURIlEtlCfS.

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14 CFR 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 of proposed ruleroaking (NPRM).

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in the flight compartment for certain aiIplanes. For a certain other airplane, this propose ~ !'G

require installing two warning level indicator lights on the P2-2 center Instrument panel

SUMMARY: We propose to adopt a new 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 and takeoff 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,

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to require new pressure altitude limitations for certain airplanes, and to advise the -===f- .

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flightcrew of the following changes: revised emergency procedures to use when a cabin

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altitude warning or rapid depressurization occurs, and revised cabin pressurization

procedures for normal operations. This proposed AD results from a design change in the

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cabin altitude warning system that would address the identified unsafe condition. We ar 7, Z-/ 10

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proposing this AD to prevent failure of the flightcrew to recognize and react to a valid I()I

cabin altitude warning horn, which could result in incapacitation of the flightcrew du·

hypoxia (lack of oxygen in body), and cqnsequeJt loss of co~rol ofthe airplane.

DATES: We must receive comments on this pro~osed AD by [INSERT DATE 45

,

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DA YS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].