[4910-13-PI DEPARTMENT OF TR<\NSPORTATlON Federal Aviation Administration 14CFR Part 39 [Docket No. FAA-2010-0036; Directorate Identifier 2009-NM-077-AD) RIN 2120-AA64 Airworthiness Directives; The Boeing Company MadeJ 737-200, -lODe, -300, -400, and -500 Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: Wepropose to adopt anew ainvorthiness directive (AD) forcertain Model 737-200, -200C, -300, -400, and -500 series airplanes. This proposed AD would require repetitive inspections forcracking and corrosion ofthe skin and surrounding structure under the number 3 very high frequency (VHF) antenna, andcorrective actio 

### ifnecessary. Also, forcertain ailplanes, this proposed AD would require replacing bonded skin panels with solid skin panels. This proposed AD results fromreports of cracks inthe skin and surrounding structure tmder thenumber 3 VHF antenna onthe lower external surface ofthe airplane atButtock Line 0.0, aftofthe main landing gear ONI;URRF.r<crS RoIJfIl'>G snWOL 

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m skin and surrounding stmcture under thenumber 3 VHF antenna, which could result in separation ofthe anterma from the ai1plane, and rapid depressurization ofthe airplane. DATES: We must receive comments onthis proposed AD by [INSERT DATE 45 DAYS AFTER DATE OFPUBLICATION INTHE FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods:

• Federal eRulemaking Portal: Go to http://•. '\'\vw.regulations.gov. Follow the instructions for submitting comments. \IT~ SYMiIOL14910-I3-P) DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39 

# 2010- 003& [DocketNo.FAA~+++++; Directorate Identifier 2009-NM-077-ADj RIN 2120-AA64 Airworthiness Directives; The Boeing Model 737-200, -lODe, -300, -400 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 Boeing Model 737-200, -200e, -300, -400, and -500 senes airplanes. 

### This proposed would require repetitive inspections for cracking and corrosion of the skin and surrounding structure under the number 3 very high frequency (VHF) antenna and corrective actions if necessary. This proposed AD would also provide for terminating action for certain repetitive inspections for certain airplanes. Also, for certain airplanes, 

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,n, this proposed AD would require replacing bonded skin panels with solid skin panels. T 1S proposed AD results from reports of cracks in the skin and surrounding structure under the number 3 VHF antenna on the lower external surface of the airplane at Buttock Lin 0.0, aft of the main landing gear wheel well. We are proposing this AD to detect and correcl cracks and corrosion of the skin and surrounding structure under the number 3 VHF antenna, which could result in separation of the antenna from the airplane, and ra ff'o\l.SI!JG depressurization of the airplane. DATES: We must receive comments on this proposed AD by [insert date 45 days aftcr OUTING SYMBOL date ofpublication inthe FEDERAL REGISTER]. ADDRESSES: You may send comments by any of the following methods:

• Federal eRulemaking Portal: Go to http://www.regulations.go\'. Follow the l<'T'AL.Si'lG1491O-I3-PJ

DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration 14CFR Part 39 [Docket No. FAA-2009-+++++; Directorate Identifier 2009-NM-077-AD]

.RIN 2120-AA64 Ainvortbiness Directives; Boeing Model 737-200, -200C, -300, -400 and -500 Series 

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ACTION: Notice ofproposed rulemaking (NPR1v1). AGENCY: Federal Aviation Administration (FAA), DOT.
SUMl\IlARY: We propose to adopt anew airworthiness directive (AD) forcertain

surrounding structure under the number 3 very high frequency (YHF) antenna and corrective actions ifnecessary. This proposed AD would also provide forterminating action forcertain repetitive inspections forcertain airplanes. Also, certain airplane grou replace the bonded skin panels with solid skin panels, before or concurrently with anoth Boeing service bulletin. Ths proposed AD results from reports ofcracks inthe skin and surrounding structure under the number 3 VHF antenna onthe lower external surface of the airplane atButtock Line 0.0, aftofthe main landing gear wheel welL We are proposing this AD todetect and correct cracks found under the number 3 YHF antenna, which could result inseparation ofthe antenna from the airplane, and rapid depressurization ofthe airplane. DATES: We must receive comments onthis proposed AD by [insert date 45 days after date ofpublication inthe FEDERAL REGISTER]. ADDRESSES: You may sendcomments by any ofthe following methods; ~1"1-

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• Federal eRulemaking Portal: Go to http;//www.regulations.l!ov. Follow the

## 14910-13-P] DEPARTMENT OF TRAl'lSPORTATION Federal Aviation Administration

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### Identifier 2009-NM-077-AD) 14CFR Part 39

ACTION: Notice ofproposed rulemaking (NPRM). Ainvorthiness Directives; Boeing Model 737-200, -200e, -300, -400 and -500 Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT.

SUMMARY: We propose to adopt anew airworthiness directive (AD) forcertain 

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surrounding structure under the number 3 very high frequency (YHF) antenna and corrective actions ifnecessary. This proposed AD would also provide for terminating action forcertain repetitive inspections forcertain airplanes. Also, certain airplane grou replace the bonded skin panels with solid skin panels, before orconcurrently with anoth Boeing service bulletin. This proposed AD results fromreports ofcracks inthe skin and surrounding structure under thenumber 3 VHF antenna on the lower external surface of the airplane at Buttock Line 0.0. aftofthe main landing gear wheel well. We are proposing this AD to detect and correct cracks found under the number 3VHF antenna, which could result in separation ofthe antenna from the airplane, and rapid 

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# q f depressurization ofthe airplane. DATES: We must receive comments onthis proposed AD by [insert date 45 days after date ofpublication inthe FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods:

• Federal eRulemaking Portal: Go to http://www.regulatiollS.goV. Follow the OUTING sYl1llOL