14910-13-1'1

DEPARTMENT OF TRANSPORTA nON

Federal Aviation Administration

14eFR Part 39 4C\

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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, )AI).... !, {-.l(

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and dOwllstop ortlle slat track assembly to detemline if the bolt, nut, or SLOpsare missi g

and to detell11ine lrthe thread protrusion of tile bolt from the nut is within speci.fied till] ts

and parts are correctly installed, and related investigative and corrective actions if

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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

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damage and corrective actions ifnecessary, and replacing the dO\vnstop hardware for tl c

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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 12 on a Boeing Model 777 aIrplane. The hole was caused when the bolt see urn '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

14 CFR Part 39

[Docket No. FAA-2009-+++++j Directorate Identifier 2009-NM-IOO-ADJ

IUN 21211-AA64

Ainvorthiness Directivesj Boeing Model 777 Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: NotiGe of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain

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Boeing Model 777 airplanes. This proposed AD would require inspecting the bolt, nut, 1"'4151;""X,

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and downstop of the slat h"ack assembly to detennine if the bolt, nut, or stops are missin' ~JEI

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and to detennine ifthe tlu'ead protrusion of the 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~

at the outboard slat number 3 and 12 outboard main track locations for holes and wear

damage and cOlTective actions if necessary, and replacing the downstop hardware for th

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outboard slats number 3 and 12 outboard and inboard main track locations. This propose DA @....-

AD results ham a repOli of a hole in the inboard main track slat can for outboard slat ~

number 12_The hole was caused when the bolt securing the dOWl1StOP migrated out of t1 .,1/0//11~/£1/5

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fitting and contacted the slat can. We are proposing this AD to detect and correct damag

to the outboard slat main track slat cans, which can allow fuel leakage into the fixed win' e(2'1 0

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leading edge in excess ofthc capacity ofthe draining system. Excess fuel leakage could

result in an uncontained fire.

DATES: We must receive comments on this proposed AD by [insert date 45 days after

date of publication in the FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:

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(4910-I3-Pj

DEPARTMENT OF TRANSPORT AnON

Federal A"iation Administration

14 eFR Part 39

jDocket No. FAA-2009-1 I I I I; 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: We propose to adopt a new airvvorthiness directive (AD) [or certain

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

and downstop of the slat track assembly to determine ifthe bolt, nut, or stops are missin

and to determine if the thread protrusion of the 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 slat number 3 and 12 outboard main track locations for holes and wear

damage and corrective actions if necessary, and replacing the downstop hardware for th

outboard slat's number 3 and 12 outboard and inboard main track locations. This propos

AD results from a report of a hole 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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to the outboard slat main track slat cans, which can allow fuel leakage into the fixed win'

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leading edgc in excess of the capacity of the draining system. Excess fuel leakage could 'ar::k~

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result in an uncontained fire. ""'-"'J

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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 of the following methods: