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',mN<:.iSI""'llOl 737 series airplanes. This proposed AD would require inspecting for part numbers ofthe 

### AtJ/vtoperational program software ofthe flight control computers, and doing corrective actions 

### ifnecessary. This proposed AD results from reports of erroneous undetected I o N<>'£V'" l output from asingle radio altimeter channel, wHichresulted inpremature autothrottle retard during approach. We are proposing this

# 10to detect and correct erroneous output NlTlAL')f5IG from aradio altimeter channel, which could reslIt inpremature autothrottle landing flare ATE retard and the loss of automatic speed control,

# ld consequent loss ofcontrol ofthe "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 ofproposed rulemaking (NPRM). 14CFR Part 39 

# 0850 IDocket No. FAA-2010-++++j Directorate Identifier 2010-NM-117-AD]

SUMMARY: We propose to adopt anew 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 ofthe 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 14CFR 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 ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt anew airv,Jrthiness directive (AD) for certain Mod 737 series airplanes. ll1is proposed AD would rbquirc inspecting for part numbers cfth operational program software ofthe flight con+' computers. and doing corrective actions ifnecessary. This proposed AD results from reports oferroneous undetected output from a single radio altimeter channel, wJich resulted inpremature autothrottle retard during approach. We are proposing this

# In to detect and correct erroneous outpu from aradio altimeter channel, which could resLt in premature autothrottle landing flar retard and the loss of automatic speed control, ~d consequent loss ofcontrol ofthe airplane. DATES: We must receive comments on this PTPosed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION IN ,HE FEDERAL REGISTER]. ADDRESSES: You may send comments by ani)!ofthe following methods:
• Federal eRulemaking Portal: Go to httb:llwww,regulations.gov. Follow the instructions for submitting comments.
• Fax: 202-493-2251. CltlCURRE"CES OltTll~G SYMBOL
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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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# 7 (z1-!JO '-.s.,...- SEfHF ACTION: Notice ofproposed 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 ofthe flight control computers, and doing corrective actions ifnecessary. This proposed AD results from reports oferroneous undetected output from asingle radio altimeter charmel, which resulted inpremature autothrottJe 

### '/1-/005 SUMMARY: Wepropose to adopt anew airworthiness directive (AD) for certain Mod 

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# &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 aradio altimeter channel, which could resllt inpremature autothrottle landing flar retard and the loss ofautomatic speed control, Jnd consequent loss ofcontrol ofthe DATE airplane. R0V11NG SYMBOl DATES: We must receive comments on this priPosed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods:
• Federal eRulemaking Portal: Go tohttp://www.regulations.gov. Follow the instructions for submitting comments .
• Fax: 202-493-2251.

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