14910-I3-P)

DEPARTMENT OFTR>\NSPORTATION



## D\ 

# MiA-1 ~'''A\5'SK; 

# c.~ n 

## 7/"(,0

rN,TIAWi" , 

# oCtlf'3 [Docket No. FAA-2010-++++; Directorate Identifier 2009-NM-264-AD) RIN 2120-AA64 Federal Aviation Administration 14CFR Part 39

Airworthiness Directives; The Boeing 

### Compry Model 757 Airplanes AGENCY: Federal Aviation Administration fAA), Department ofTransportation (DOT). ACTION: Notice ofproposed rulemakiog (NPRM). SUMMARY: The FAAproposes to supersede an existing ailWorthiness directive (AD 

# ?J-jl4-/,

# a

, $YMlIOl that applies toall 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 ofthe center fuel tank. That AD also requires inspections of un:<C;SI'M!lllL the wire bundle support installations to verify ifcertain clamps are installed and ifTefl n I~'ITI"LS'S.K) sJeeving covers the wire bundles inside the leftand right equipment cooling system ba

I pAn UTlNQSYMBOL "m.•. <S-SKl
AT~
1"" S"'lllOl "'ITIALS'S.K)
ATE airplane, lightning strike, which could result in afuel tank explosion and consequent loss ofthe and center fuel tanks from becoming an ignition source, inthe event ofa fault current 0 strike protection. We areproposing this AD to detect and correct improper wire bundl "'","'1'1"' ---- on the leftand right rear spars, and on the left and right front spars; and corrective actio s ifnecessary. This proposed AD would also re~uire sealing the additional fasteners ont

## ''i!'''''"'''"' rear spar inside the left and right main fueltan~s, This proposed AD results from a fue '''''''AI»'S'(; manufacturer that additional fasteners inthe main fueltanks must be sealed forlightnin system review conducted by the manufacturer. We have received reports from the
support installation and sleeving and toprevent improperly sealed fasteners inthe main(4910-13-P]

DEPARTMENT OF TRANSPORT ATlON Federal Aviation Administration 14CFR 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 ofTransportation (DOT). OUT1"G Sfl"~OI 

### ~~-IJ.jOS lNITIAlS(SIG 

### ....J<L 

# ,. ~I",y,·,·L m [-(/-Iv DUnNe SVMeOl

fasteners on the front and rear spars inside the le'ftand right main fuel tanks and on the rear spar and lower panel ofthe center fuel tank. That AD also requires inspections of ACTION: Notice ofproposed rulernaking (NPRM).

the wire bundle support installations toverify ifcertain clamps are installed and ifTeflo sleeving covers the wire bundles inside the leftJnd 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 , ifnecessary. This proposed AD would also require sealing the additional fasteners onth . I D~ rear spar inside the left and right main fuel tanks. Jhis proposed AD results from afuel 

# to flY 10 I O\fl1NG Sr'M~OL system review conducted bythe manufacturer. WI ehave received reports from the U'm"'LSlSIG manufacturer that additional fasteners Inthe main fuel tanks must be sealed for lightnin 

## /tPn, -I' 

## >5 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' 

## C ""''''95'''- 

# :;;£A-A~



# .., strike protection. We are proposing this AD todetect and correct improper wire bundle support installation and sleeving and to prevent improperly sealed fasteners in the main and center fuel tanks frombecoming an ignition source, inthl$event ofa fault current or lightning strike, which could result inafuel tank!explosion and consequent loss ofthe airplane. 

# ..,(4910-13-P)

DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration 14CFR 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 ofTransportation (DOT). 

### '" uiO"/() 

## f )11J·1i5 'NIfIAlSlSIG 

### ....:.a..... 

# "rsl... ",v,.. 

## ,,!,.; ATE ' [-11-10


### 11 10


## A:f...i\V'l--V.:~<i_-=) Nrn~lSISIG that applies to all Model 757 airplanes. The existing AD currently requires sealing the ACTION: Notice ofproposed rulemaking (NPRM). OlIn"GSYMBQL 

## i1Dn,-I' 05 SUMMARY: The FAA proposes to supersede an existing ainvorthiness directive (AD) ~.oJ.SJSlG 

### ,.( .\1...", o.o.TE •. fasteners onthe front and rear spars inside the left and right main fuel tanks and on the rear spar and lower panel ofthe center fuel tank. That AD also requires inspections of the wire bundle support installations to verify ifcertain 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 I ifnecessary. This proposed AD would also require sealing the additional fasteners ont 

## ." rear spar inside the left and right main fuel tanks. This proposed AD results from afuel 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 ounOIG SV"'BOl. NlnA.SlSIG strike protection. We areproposing this AD to detect and correct improper wire bundle support installation and sleeving and to prevent improperly scaled fasteners inthe main and center fuel tanks from becoming an ignition source, inth~event ofafault current or lightning strike, which could result inafuel tank explosion and consequent loss ofthe airplane. INITIAlS/S1G