14910-I3-P)

DEPARTMENT OFTR>\NSPORTATION

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[Docket No. FAA-2010-++++; Directorate Identifier 2009-NM-264-AD)

RIN 2120-AA64

Federal Aviation Administration

14 CFR Part 39

Airworthiness Directives; The Boeing Compry Model 757 Airplanes

AGENCY: Federal Aviation Administration fAA), Department of Transportation

(DOT).

ACTION: Notice of proposed rulemakiog (NPRM).

SUMMARY: The FAA proposes to supersede an existing ailWorthiness directive (AD ?J-jl4-/, a

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that applies to all Model 757 airplanes. The existing AD currently requires sealing the ".Nli"- lOb

fasteners on the front and rear spars inside the left and right main fuel tanks and on the

rear spar and lower panel of the center fuel tank. That AD also requires inspections of

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the wire bundle support installations to verify if certain clamps are installed and if Tefl n

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sJeeving covers the wire bundles inside the left and right equipment cooling system ba

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lightning strike, which could result in a fuel tank explosion and consequent loss of the

and center fuel tanks from becoming an ignition source, in the event of a fault current 0

strike protection. We are proposing this AD to detect and correct improper wire bundl

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on the left and right rear spars, and on the left and right front spars; and corrective actio s

if necessary. This proposed AD would also re~uire sealing the additional fasteners on t ''i!''''' "'''"'

rear spar inside the left and right main fuel tan~s, This proposed AD results from a fue '''''''AI»'S'(;

manufacturer that additional fasteners in the main fuel tanks must be sealed for lightnin

system review conducted by the manufacturer. We have received reports from the

support installation and sleeving and to prevent improperly sealed fasteners in the main
(4910-13-P]

DEPARTMENT OF TRANSPORT ATlON

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-++++j Directorate Identifier 2009-NM-264-ADj

RIN 2120-AA64

Airworthiness Directives; The Boeing Company Model 757 Airplanes

AGENCY: Federal Aviation Administration (. A), Department of Transportation

(DOT).

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fasteners on the front and rear spars inside the le'ft and right main fuel tanks and on the

rear spar and lower panel of the center fuel tank. That AD also requires inspections of

ACTION: Notice of proposed rulernaking (NPRM).

the wire bundle support installations to verify if certain clamps are installed and ifTeflo

sleeving covers the wire bundles inside the left Jnd right equipment cooling system bays OVTING SVMBOL

on the left and right rear spars, and on the left a+ right front spars; and corrective actio ,

if necessary. This proposed AD would also require sealing the additional fasteners on th .

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rear spar inside the left and right main fuel tanks. Jhis proposed AD results from a fuel to flY 10

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system review conducted by the manufacturer. WI e have received reports from the

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manufacturer that additional fasteners In the main fuel tanks must be sealed for lightnin

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SUMMARY: The FAA proposes to supersede an existing airworthiness directive (AD) l~lSJSlG

that applies to all Model 757 airplanes. The existing AD currently requires sealing the OATE'

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strike protection. We are proposing this AD to detect and correct improper wire bundle

support installation and sleeving and to prevent improperly sealed fasteners in the main

and center fuel tanks from becoming an ignition source, in thl$event of a fault current or

lightning strike, which could result in a fuel tank!explosion and consequent loss ofthe

airplane.

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(4910-13-P)

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-++++; Directorate Identifier 2009-NM-264-AD]

RIN 2120-AA64 I

Airworthiness Directives; The Boeing Compan~ Model 757 Airplanes

AGENCY: Federal Aviation Administration (F~A),Department of Transportation

(DOT).

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that applies to all Model 757 airplanes. The existing AD currently requires sealing the

ACTION: Notice of proposed rulemaking (NPRM). OlIn"GSYMBQL

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SUMMARY: The FAA proposes to supersede an existing ainvorthiness directive (AD) ~.oJ.SJSlG

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fasteners on the front and rear spars inside the left and right main fuel tanks and on the

rear spar and lower panel of the center fuel tank. That AD also requires inspections of

the wire bundle support installations to verify if certain clamps are installed and ifTeflo

sleeving covers the wire bundles inside the left and right equipment cooling system bays

on the left and right rear spars, and on the left an1 right front spars; and corrective actio

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if necessary. This proposed AD would also require sealing the additional fasteners on t

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rear spar inside the left and right main fuel tanks. This proposed AD results from a fuel

system review conducted by the manufacturer. We have received reports from the

manufacturer that additional fasteners in the main fuel tanks must be sealed for lightnin

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strike protection. We are proposing this AD to detect and correct improper wire bundle

support installation and sleeving and to prevent improperly scaled fasteners in the main

and center fuel tanks from becoming an ignition source, in th~ event of a fault current or

lightning strike, which could result in a fuel tank explosion and consequent loss of the

airplane.

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