[4910-I3-P]

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

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RlN 2120-AA64

Airworthiness Directives; The Boeing Company Model 777 Airplanes

AGENCY: Federal Aviation Administration (F1A), DOT.

ACTION: Final rule.

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IDocket No. FAA-2009-1249j Directorate Identifier 2009-NM-IOO-ADj Amendmen "\ 'i ~ '

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39-**; AD *(1/ )..0 I 0 -1'-1 /3 "'"

14 CFR 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 of the slat track DArE

assembly to determine if the bolt, nut, or stops are missing and to determine if the threa R"uUng Syrn~o'

protrusion of the bolt from the nut is within speJified limits and parts are cOlTectly S£)1-At:C~

installed, and related investio-oativeand correctivl actions if necessary. For certain tI

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airplanes, this AD also requires inspecting the Sft cans at the outboard slat number 3 an

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12 outboard main track locations for holes and ear damage, and corrective actions if Af::m1D'lt:/

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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 a report of a hole in th 5/18/16

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inboard main track slat can for outboard slat number 12 on a Model 777 airplane. The .....-'7 I INITIAlS/SIC

hole was caused when the bolt securing the dOwrstop migrated out of the fitting and ~

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contacted the slat can. We are issuing this AD to detect and conect damage to the ro1u (0

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outboard slat main track slat cans, which can allbw fuel leakage into the fixed wing 'AN~_\0\

I ""'tiD--- leading edge in excess of the capacity of the dra ning system. Excess fuel leakage could _ ,

result in an uncontained fire.

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14910-13-P)

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration _ OJRRENCES

OVTlNG SYMBOL

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0\If10lG SYMBOl..

14 CFR 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 a new airworthiness directive (AD) for certain Model 77 InAL51SIG

airplanes. This AD requires'inspecting the bolt, hut, and downstop of the slat track OAT!:

assembly to determine if the bolt, nut, or stops are missing and to determine ifthe threa

protrusion of the bolt from the nut is within specified limits and parts are correctly

installed, and related investigative and corrective actions if necessary. For certain

airplanes, this AD also requires inspecting the slat cans at the outboard slat number 3 an

12 outboard main track locations for holes and wear damage, and corrective actions if

necessary; and replacing the downstop hardware for the outboard slats number 3 and 12

outboard and inboard main track locations. This f'\D results from a report of a hole in th

,.

inboard main track slat can for outboard slat number 12 on a Model 777 airplane. The

hole was caused when the bolt securing the downstop migrated out of the fitting and

contacted the slat can. We are issuing this AD to detect and correct damage to the

outboard slat main track slat cans. which can allolw fuel leakage into the fixed wing

leading edge in excess of the capacity of the draining system. Excess fuel leakage could ,

•• mALS!SIG

result in an unconlained fire. "

OUTING SYMBOL

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