[4910-13-P]



### DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 

### 39 

### 1t1l/J1<7 INJ'n,\tSI"I~ 

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### AtJM- //L/ "(lIIlIN",Y'" '- 

### (Docket No. FAA-2009-0908j Directorate Identifier 2009-NM-067-ADj R1N 2120-AA64 I

period. 

### Airworthiness Directives; The Boeing 

### CompTY Model 757 Airplanes 

### AGENCY: Federal Aviation Administration (BAA), DOT.



### SUMMARY: We are revislng an earlier 

### proposed anworthiness directive (AD) for the products listed above. That NPRM proposed rCj1laCiogthe power control relays for the fuel boost pumps and override pumps with new relays having a ground fault interrupt 

### ['L'L~-lO (GFI) feature. That NPR1v1was prompted by 

### results from fuel system reviews conductcc ROUTINOSYMIJOL. I 

### by tl~emanUfact~rer. 

### ThiS,action. revises that 

### 'RM for all ai~lan~s 

### by prOPosin~ ~o INll'W.SiS,G reqUIre an e1ectncal bondmg reslstance measurement for certam 

### GFI relays to venfy tha ~01l' certain bonding requirements are met. This actihn also revises that NPRM by proposing ROtrElNGSYMflUL

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### I

. . I 

### h' I to requIre, lor certam alrp aoes, an mspectlon to ensure t at certam screws are proper y 'NITiAUlISlG

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.. . 

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. . mstal1e , and re-mstallmg longer screws lfnecysar

### y. We arc proposmg thIs om supplemental NPRM to prevent damage to the fuel pumps caused by electrical arcing tl1' UI'INGSHWOL could introduce an ignition source in the fuel tabk, which, in combination with Dammab TlAlS'SEG fuel vapors, could result in afuel tank eXPlosiOb and consequent loss of the airplane. '\11' Since these actions impose an additional burdell over that proposed in the NPRM, we ar 

### o~"c""." reopening the comment period to allow the pub ic the chance to comment on these INITlA'-"SEl, proposed changes. ''''Tf.149W-13-PI DEPARTMENT OFTRANSPORTATION -"j"C1J~.1 ~I:~~ OI!n~~ ';"'~OL Fedcra,1 Aviation Administratioll 14CFR Part 39 IDocket No. FAA-2009-0908; Db-ec(orate Identifier 2009-NM-067-ADI RlN 212D-AA64 Airworthiness Directives; The Boeing Companj Model 757 Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. .,. 

# I " /r',2410 ACTION: Supplemental notice ofproposed ruJemaking (NPRM); reopening ofcommell '\f>lJol.'!<G~·"1iOI S litJl'1- r]o

120 period. 1"1" SUMMARY: We are revismg anearlier proposer airworthiness directive (AD) forthe products listed above. That NPRM proposed replacing the power control relays forlhe fuelboost pumps andoverride pumps \vith newrelays having aground faull interrupt (GFI) feature. That NPRM was prompted by results from fuel system reviews conducted ""( bythe manufacturer. This action revises that NPRiMfor all airplanes byproposing to require anelectrical bonding resistance measurem1ent forcertain GFI relllYsto verify tl1 t ,," : certain bonding requirements are met, This <1ctio11 also revises that NPRM by proposing ,.~ to require, forcertain airplanes, uninspection to ensure Lhatcertain screws areproperly installed, and re-installing longer screws ifneces+y, We ••. eproposing ,his supplcmemaJ NPRM to prevent damage to the fuel pumps caused by eleclrical arcing tha 

## " could introduce an ignition source inthe fuel tank[ which, in combination with flammabl ",,1lJ'fC'<Y~ fuel vapors. could result ina fuel tank explosion and consequent loss orthe airplane. Sinee these actions impose an additional burden over that proposed inthe NPRM, we are 

## ." rcopening the comment period to allow thepublic the chance to comment on these proposed changes. ''''TIAl4'~I(;1491O-13-P} DEPARTMENT OF TRANSPORTATION ""(l,R"'''''C~ mo{;s·· ••o, 

# a-fiM-1IY: J),; Pw(jQ0 [Docket No. FA..4.-2009-0908; Directorate Identifier 2009RNM~067-ADI

AGENCY: Federal Aviation Administmtion (FAA), DOT. '~Tf'

.., . I

. , I' :s,z",(O ACl (ON: Supplemental natlee ofproposeu rule Imakll1g (NPRM); reopenll1g ofcommen 

## ""A13-";'_HI;"]O') 12v period. ,,,"" ~.---- RIN 2120-AA64 Federal Aviation Administration

Airwortbiness Directives; The Boeing Company Model 757 Airplanes 14CFR Part 39

SUMMARY: We are revising anearlier proposed alrworthiness directive (AD) forthe products listed above. That NPRM proposed replacing the power control relays forthe fuelbooS! pumps and override pumps with new 

### relayS having ag,ouud fault inle,mpt 

# 'C3:'~ (GFf) feature. That NPRM was prompted by results from fuel system reviews conducted )A'~

### 1-11~," by the manufacturer. This action revises that NPRM for all airplanes byproposing 10 CUTI'ICs)""o<- require an electrical bonding resistance measurement forcertain GFI relays (0venfy Ihat .Il, , •••••

# :1-
certain bonding requirements are met. This actidn also revises thaI NPRM byproposing "oil to require, Corcertain airplanes, aninspection to ensure that certain screws Hreproperly installed. and fe-installing longer screws ifnecessary. We are proposing this 

### """A,,,,,.,,, supplemental NPRM to prevent damage to the fuel pumps caused by electrical arcing tha•• ..-_. II:~lf could introduce an ignition source inthe fuel tank, which, in combination with narrunabl'"M===~_ I

### ",m""'~n"'''' fuel vapors, could result inafuel tank explosion and consequent loss ofthe <lirplane. Since these actions impose an addItional burden over that proposed inthe NPRM, we are

# L.,,-

_ k;oll reopening the comment period to allow the public the chance to comment on these proposed changes.