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DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration '14CFR Part39 

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Senes Airplanes AGENCY: Federal Aviation Administration (FAA), Department 

# orTransportation (DOT). ACTION: Notice ofproposed ru!cmaking (NPR1v1). SUMMARY: The FAA proposes to supersede an existing airworthiness directive (AD that applies to all Boeing Model 737-600, -700, -700e, -800, -900, and -900ER series ""~UJ"REIWE' ""\1T1N(i~nlRO'- 

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## ~'"""'1,---- airplanes. The e-xisting AD cun'cntly requires repetitive detailed inspections of the slat 

### b"'~"~'~'l~i ,n~w<)~,-- track downstop assemblies to verify that proper hardware is Il1stalled, one-time torquin~ b~-- orthe nul and bolt, and con-ective actions ifnecessary_ This proposed AD would also require replacing the hardware of the down stop assembly with new hardware of the down stop assembly, doing a detailed inspection or aborcscope inspection of tile slat "m'''.~S,G cans on each wing and the lower rail ortlle slat main tracks for debris, replacing the bol s
"ATE oftlle aft side guide with new bolts, and removing any debris found in the slat can_ Thi proposed AD also would remove airplanes ham the applicability_ This proposed .W results from reports of parts coming off the main slat track downstop assemblies. We a '6,nl'.',">iJ'; proposing this AD 10prevent loose or missing pmis from the main slat track dowllstop 

### 'M'" assembhes from falling into the slat can and causing a puncture, which could result in a ""Lrn~(;>,",lIJ()L fuel leak and consequent fire. I.,m,\,s:"" DATES: We must receive cOl11ments all this proposed AD by [mseli date 45 days atlc 'M,". dule of publication tll tbe FEDERAL REGISTER].(491O-13-V(

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Pa,'t 39 (Docket No, FAA-2009-+++++; Directorate Identifier 2009-NM-U80-AD( 

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AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). 

### (;:.1H'i Airworthiness Directives; Boeing Model 737-600, -700, -70De, -800, -900, and -900E

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date ofpublication in tbe FEDERAL REGISTER]. slat track downstop assemblies, which could result in afuel leak and consequent fire. assemblies. We arc proposing th.isAD toprevent loose orlllissing part'sfrom the main necessary. This proposed AD also removes ailplanes from the applicability. This 1\ I proposed AD results from reports ofparts coming offthe main slat track downstop ofthe aft side guide with new bolts, and removing any debris found inthe slat can if require replacing the hardware ofthe down stop assembly with anew hardware ofthe ofthe nut and bolt, and corrective actions ifnecessary. This proposed AD would also track downstop assemblies to verify that proper hardware is installed, onc-time torquing [>AT~ 

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### A1-Jfn-,)6 ACTION: Notice ofproposed fulcmaking (NPRM). lNmM.5iS;u 

# ~,L';-r!4r SUMMA.RV: The FAA proposes to supersede an existing airw0l1l1incss directive (AD) 

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## 'I£-1. ..;? that applies to all Boeing Model 737-600, -700, -70De, -800, -900, and -900ER series Rou"ng 5y,,;IIo'

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DATES: We must receive comments on this proposed AD by [insert date 45 days after
ADDRESSES: You may send comments by any ofthe following methods: INIT!AlSlSIG 

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### 14910-13-U]

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 

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AGENCY: Federal Aviation Administration (FAA), Department ofTransportation tlnJAISISIG 

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## '" that applies to all Boeing Model 737-600, -700, -700C, -800, -900, and -900ER series ACTION: Notice ofproposed rulemaking (NPRM),

airplanes. The existing AD currently requires repetitive detailed inspections ofthe slat NITlAlS{SJG 

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m '0 track downstop assemblies toverify that proper hardware isinstalled, one-time torquing ofthe nut and bolt, and corrective actions ifnecessary. This proposed AD would also require replacing the hard'\.vareofthe do\\'Jl stop assembly with anew hardware ofthe down stop assembly, doing adetailed inspection or aborescope inspection ofthe slat cans ofeac.hwing and the lower rail ofthe slat main tracks for debris, replacing the bolt ofthe aft side guide with new bolts, aTJd removing any debris found inthe slat can if necessary. This proposed AD also removes airplanes from the applicability. This proposed AD results from reports ofparts coming offthe main slat track downstop assemblies. We arc proposing this AD to prevent loose ormissing parts from the main slat track dO\~"'nstop

assemblies, which could result in afuel leak and consequent fire. DATES; Wcmust receive comments oftthlSproposed AD by [insert date 45 days after date ofpublication intbc FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods: