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737 series airplanes. This proposed AD would require inspecting for part numbers of the AtJ/vtoperational program software of the flight control computers, and doing corrective

actions if necessary. This proposed AD results from reports of erroneous undetected

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output from a single radio altimeter channel, wHich resulted in premature autothrottle

retard during approach. We are proposing this 10to detect and correct erroneous output NlTlAL')f5IG

from a radio altimeter channel, which could reslIt in premature autothrottle landing flare ATE

retard and the loss of automatic speed control, ld consequent loss of control of the "OUTINGS"Mool.

Federal Aviation Administration

RJN 2120-AA64

Ainvorthiness Directivesj The Boeing Company Model 737-600, -700, -700C, -800,

and -900 Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

14 CFR Part 39 0850

IDocket No. FAA-2010-++++j Directorate Identifier 2010-NM-117-AD]

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

airplane. INITIAL,'SIG

DATES: We must receive conunents on this PffPosed AD by [INSERT DATE 45

DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].

ADDRESSES: You may send comments by ant of the following methods: l"ITIAlSiSIG

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the

instructions for submitting comments .

• Fax: 202-493-2251.
14910-13-P]

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

14 CFR Part 39

IDoeket No. FAA-2010-++-++; Directorate Identifier 2010-NM-117-AD]

RIN 2120-AA64

Ainvo-rthiness Directives; The Boeing Comp~y Model 737-600, -700, -70De, -800,

and -900 Series Airplanes

AGENCY: Federal Aviation Administration (FrA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airv,Jrthiness directive (AD) for certain Mod

737 series airplanes. ll1is proposed AD would rbquirc inspecting for part numbers cfth

operational program software of the flight con+' computers. and doing corrective

actions if necessary. This proposed AD results from reports of erroneous undetected

output from a single radio altimeter channel, wJich resulted in premature autothrottle

retard during approach. We are proposing this In to detect and correct erroneous outpu

from a radio altimeter channel, which could resLt in premature autothrottle landing flar

retard and the loss of automatic speed control, ~d consequent loss of control of the

airplane.

DATES: We must receive comments on this PTPosed AD by [INSERT DATE 45

DA YS AFTER DATE OF PUBLICATION IN ,HE FEDERAL REGISTER].

ADDRESSES: You may send comments by ani)!of the following methods:

• Federal eRulemaking Portal: Go to httb:llwww,regulations.gov. Follow the

instructions for submitting comments.

• Fax: 202-493-2251.

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DEPARTMENT OF TRANSPORT AT10N

Federal Aviation Administration

14 CFR Part 39

(Docket No. FAA-2010-++++; Directorate Identifier 2010-NM-117-AD)

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ACTION: Notice of proposed rulemaking (NPRM).

RlN 2120-AA64

Airworthiness Directives; The Boeing Company Model 737-600, -700, -70De, -800,

and -900 Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

operational program software of the flight control computers, and doing corrective

actions if necessary. This proposed AD results from reports of erroneous undetected

output from a single radio altimeter charmel, which resulted in premature autothrottJe

'/1-/005

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Mod iVJPfuf' &J

737 series airplanes. This proposed AD would require inspecting for part numbers ofth

retard during approach. We are proposing this AD to detect and correct erroneous outpu

from a radio altimeter channel, which could resllt in premature autothrottle landing flar

retard and the loss of automatic speed control, Jnd consequent loss of control of the

DATE

airplane.

R0V11NG SYMBOl

DATES: We must receive comments on this priPosed AD by [INSERT DATE 45

DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER].

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

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the

instructions for submitting comments .

• Fax: 202-493-2251.

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