14910-13-1'1 DEPARTMENT OF TRANSPORTA nON Federal Aviation Administration 14eFR Part 39 4C\



### \1 I IDocket No. FAA-Z009-+y-4'+; Directorate Identifier 2009-NM-IOO-ADI RlN 2120-AA64 Airworthiness Directives; Boeing Model 777 Airplanes AGENCY: Federal Aviation Adminjstration (FAA), DOT. ACTION: Notice of proposed ru1cmaking (NPRM). SUMMARY: We propose to adopt a new airworthiness diree-tive (AD) for certain Boeing Model 777 airplanes. This proposed AD would require inspecting the bolt, nut, )

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## {-.l( ROIJl'INt!,""001. and dOwllstop ortlle slat track assembly to detemline ifthe bolt, nut, or SLOpsare missi g and to detell11ine lrthe thread protrusion of tile bolt from the nut is within speci.fied till] ts andparts are correctly installed, and related investigative and corrective actions if RmTrlNG "'''""L necessary. For certain airplanes, this proposed \vould also require inspecting the slat ea s at the outboard slat number 3 and 12 outboard main track locations for holes and wear l.""l'c. damage and corrective actions ifnecessary, and replacing the dO\vnstop hardware for tl c "OdL'n~(;S"MHOL outboard slats number J and 12 outboard and inboard main lTack locations. This propo - AD results from a report of a hole in the inboard main track slat can for outboard slat number 12on a Boeing Model 777 aIrplane. The hole was caused when the bolt seeurn

# 'Jt the downstop migrated oul of the fitting and contacted the slat can. We are proposing tl'rsUTLNG"·""~L AD to detect and con-eet damage to the oLltboard slat main track slat cans, which can allow fuel leakage into the fixed wing leading edge in excess of the capacity ortlle draining systcm. Excess fuel leakage could result in an uncontained fire. 

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DATES: Wc must receive comments on this proposed AD by [insert date 45 days aftel'N'Tf~I"<'5lr, date ofpublicatioll in the FEDERAL REGISTER]. ADDRESSES: You may send comments by any of the following methods:14910-13-PJ

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39 [Docket No. FAA-2009-+++++j Directorate Identifier 2009-NM-IOO-ADJ IUN 21211-AA64 Ainvorthiness Directivesj Boeing Model777Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: NotiGeofproposed rulemaking (NPRM). SUMMARY: We propose to adopt anew airworthiness directive (AD) for certain _ON[VP.RErlCES P,OuTING S~"BOL

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Boeing Model 777 airplanes. This proposed AD would require inspecting the bolt, nut, 

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# I T "c r and to detennine ifthe tlu'eadprotrusion ofthe bolt from the nut is within specified limit and parts are correctly installed, and related investigative and corrective aciions if i~5iS.G necessary. For certain airplanes, this proposed would also require inspecting the slat can DA~ atthe outboard slat number 3 and 12outboard main track locations forholes and wear damage and cOlTectiveactions ifnecessary, and replacing the downstop hardware forth OlJT1~GSYMBOL
INmAl$/$IG outboard slats number 3 and 12outboard and inboard main track locations. This propose DA @....- AD results ham arepOliofahole inthe inboard main track slat can for outboard slat ~ number 12_The hole was caused when the bolt securing the dOWl1StOP migrated out oft1 .,1/0//11 ~/£1/5 i~lflAL.5/- fitting and contacted the slat can. We are proposing this AD to detect and correct damag tothe outboard slat main track slat cans, which can allow fuel leakage into the fixed win' 

# e(2'1 0 ~a"T!~G $YME;Ql leading edge in excess ofthc capacity ofthe draining system. Excess fuelleakage could result inan uncontained fire. DATES: We must receive comments on this proposed AD by [insert date 45 days after date ofpublication inthe FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods: ~~ INlTIA<.$ISiG t' ' L~I~/1~ DATE 

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DEPARTMENT OF TRANSPORT AnON Federal A"iation Administration 14eFR Part 39 jDocket No. FAA-2009-1 IIII; Directorate Identifier 2009-NM-JOO-ADI

.RIN 2120-AA64 Ainvorthincss Directives; Boeing Model 777 Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notic:e of proposed rulemaking (NPRM). SUMMARY: Wepropose to adopt anew airvvorthiness directive (AD) [or certain Boeing Model 777 airplanes. This proposed AD would require inspecting the bolt, nut, and downstop ofthe slat track assembly to determine ifthe bolt, nut, or stops are missin and to determine 

### ifthe thread protrusion ofthe bolt from the nut is within specified limit and parts are correctly installed~and related investigative and corrective actions if necessary. For cell'ain airplanes, this proposed would also require inspecting the slat can at the outboard slatnumber 3 and 12outboard main track locations forholes and wear damage and corrective actions ifnecessary, and replacing the downstop hardware forth outboard slat'snumber 3 and 12outboard and inboard main track locations. This propos AD results from areport ofahole in the inboard main track slat can for outboard slat number 12.The hole was caused when the bolt securing the downstop migrated out oft fitting and contacted the slat can. We are proposing this AD to detect and correct damag 

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tothe outboard slat main track slat cans, which can allow fuel leakage into the fixed win' 0\fI1t>6 "'SYf<llOl leading edgc inexcess ofthe capacity ofthe draining system. Excess fuel leakage could 

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### "'0/ I DATES: We must receive comments on this proposed AD by [insert date 45 days after 0 

# 7( 01 ovm'Ci $'fM5OI. date ofpubiica'iol1 in the FEDERAL REGISTER]. ADDRESSES: You may send conmlents by any ofthe following methods: