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DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 (Docket No. FAA-2010-1 IIII; Directorate Identifier 2009-NM-234-AD) 

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## '" 5, Ain\'orthincss Directives; The Boeing Company Model 757 Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM).



# - - SUMMARY: We propose to adopt a new airworthiness directive (AD) for all Model 75 OU NG H 

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# if series airplanes. This proposed AD would require adetailed inspection ofthe inboard an ~lllSJSJG 

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# 1-/"'/' L downstop assembly nuts ofslat nwnbers 1through 10,excluding the outboard track of outboard main track downstop assemblies and atorque application to the main track slats 1and 10, a detailed inspection ofall slat track housings, and related corrective actions ifnecessary. This proposed AD results from reports offuel leaking from the fro spar ofthe wing through the slat track housing. We areproposing this AD to detect and OUll $'<"501. correct incorrectly installed main track downstop assemblies, which, when the slat is retracted, could cause apuncture inthe slat track housing leading to a fuel leak and potential fire. 

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DATES: Wemust receive comments on this proposed 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://wvifw.regulations.gov. Follow the instructions for submitting comments .
• Fax: 202-493-2251.

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DEPARTMENT OF TR>\NSPORTATION 14CFR Part 39 Federal Aviation Administration



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ADDRESSES: You may send comments by any ofthe following methods: DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. DATES: We must receive comments on this proposed AD by [INSERT DATE 4S

• Fax: 202-493-2251. • Federal eRulemaking Portal: Go to hnp:II\.\;ww.re~mlations.gov. Follow the retracted, could cause apuncture inthe slat track housing leading to a fuel leak and correct incorrectly installed main track downstop assemblies, which, when the slat is spar ofthe wing through the slat track housing. We are proposing this AD to detect and actions ifnecessary. This proposed AD results from reports of fuel leaking [Tomthe fro

instructions for submitting comments . AGENCY: Federal Aviation Administration (FAA), DOT. #IS~fJl'l'llt"" 

## , ,= ACTION: Notice ofproposed rulemaking (NPRM). 

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# . . SUMMARY: We propose to adopt a new airworthiness directive (AD) for all Model 75 Ole; M " "I l"h" dAD Id " d il d" " f h "b d 

## f1IJi11-IZbIf senes alrpalles. ISpropose WOll reqUirea eta e mspeClion0 t e In oaf an~';lG ._ outboard main track downstop assemblies and atorque application to the main track [I.tE 

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# &/~/\L downstop assembly nuts ofslat numbers I through 10,excluding the outboard track of s.....- slats I and 10,a detailed inspection ofall slat track housings, and related corrective

potential tire. 

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