[4910-I3-P]

DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration



# -C'- ~OUl1NG SYMBOl • RlN 2120-AA64 Airworthiness Directives; The Boeing Company Model 777 Airplanes AGENCY: Federal Aviation Administration (F1A), DOT. ACTION: Final rule. l1(:fI1-II'I mInAL.$/SIG IDocket No. FAA-2009-1249j Directorate Identifier 2009-NM-IOO-ADj Amendmen "\ 'i ~ ' 

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_ h-ulCh:U 39-**; AD 

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## -1'-1 /3 "'" 14CFR Part 39

SUMMARY: We are adopting a new airworthirSS directive (AD) for certain Model 77 InAt.$ISIG airplanes. This AD requires inspecting the bolt,

# rut, and downstop ofthe slat track DArE assembly to determine 

### ifthe bolt, nut, or stops are missing and to determine ifthe threa R"uUng Syrn~o' protrusion ofthe bolt from the nut iswithin speJified limits andparts are cOlTectly S£)1-At:C~ installed, and related investio-oative and correctivl actions ifnecessary. For certain tI

I ATf~LU airplanes, this AD also requires inspecting the Sft cans atthe outboard slat number 3 an OlfTT"G Sl'MBOL 12outboard main track locations for holes and ear damage, and corrective actions if 

### Af::m1D'lt:/ I A ISlG necessary; and replacing the downstop hardwar~ for the outboard slats number 3 and 12 • DATE. / 

## I outboard and inboard main track locations. This AD results from areport ofahole in th 

### 5/18/16 Qvn"G 5YM60L inboard main track slat can for outboard slat number 12on aModel 777 airplane. The .....- '7 

# I INITIAlS/SIC hole was caused when the bolt securing the dOwrstop migrated out ofthe fitting and ~ 

## ,~ contacted the slat can. We are issuing this AD to detect and conect damage to the 

# ro1u (0 I OUTINGS aOl outboard slat main track slat cans, which can allbw fuel leakage into the fixed wing 

# 'AN~

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# ""'tiD--- leading edge inexcess ofthe capacity ofthe dra ning system. Excess fuel leakage could

_ , result in an uncontained fire. 

### -lull14910-13-P)

DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration

_ OJRRENCES OVTlNG SYMBOL

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### -.a" 5/i-f (0 ",-~ 0\If10lG SYMBOl.. 14CFR Part 39 

### fIUn-i1lf INI"T1ALSISIt> -- (Docket No. FAA-2009-1249; Directorate Identifier 2009-NM-IOO-AD; Amendmen 0"7
. I 11 -LttDV),.t lAl[ 39-*'; AD **1
Airworthiness Directives; The Boeing Company"Model 777 Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule. RlN 2120-AA64

SUMMARY: We are adopting anew airworthiness directive (AD) for certain Model 77 InAL51SIG airplanes. This AD requires'inspecting the bolt,

# hut, and downstop ofthe slat track OAT!: assembly to determine ifthe bolt, nut, or stops are missing and to determine ifthe threa protrusion ofthe bolt from the nut is within specified limits and parts are correctly installed, andrelated investigative and corrective actions ifnecessary. For certain airplanes, this AD also requires inspecting the slat cans atthe outboard slat number 3 an 12outboard main track locations forholes and wear damage, and corrective actions if necessary; and replacing the downstop hardware forthe outboard slats number 3 and 12 outboard and inboard main track locations. This f'\D results from areport ofahole in th 

# ,. inboard main track slat can for outboard slat number 12on aModel 777 airplane. The hole was caused when the bolt securing the downstop migrated out ofthe fitting and contacted the slat can. We are issuing this AD to detect and correct damage tothe outboard slat main track slat cans. which can allolwfuel leakage into the fixed wing leading edge in excess ofthe capacity ofthe draining system. Excess fuel leakage could , ••mALS!SIG

result in an unconlained fire. 

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OUTING SYMBOL
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