[4910-13-P]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

1t1l/J1 <7

INJ'n,\tSI"I~

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"(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 rCj1laCiog the 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~e manUfact~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

. C •. I . . I h' I

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

. d .. . I . . mstal1e , and re-mstallmg longer screws lfnecysary. 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 a fuel 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 OF TRANSPORTATION -"j"C1J~.1~I:~~

OI!n~~';"'~OL

Fedcra,1 Aviation Administratioll

14 CFR 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 of proposed ruJemaking (NPRM); reopening of commell '\f>lJol.'!<G~·"1iOI S

litJl'1- r]o

120

period. 1"1"

SUMMARY: We are revismg an earlier proposer airworthiness directive (AD) for the

products listed above. That NPRM proposed replacing the power control relays for lhe

fuel boost pumps and override pumps \vith new relays having a ground faull interrupt

(GFI) feature. That NPRM was prompted by results from fuel system reviews conducted ""(

by the manufacturer. This action revises that NPRiM for all airplanes by proposing to

require an electrical bonding resistance measurem1ent for certain GFI relllYs to verify tl1 t ,," :

certain bonding requirements are met, This <1ctio11also revises that NPRM by proposing ,.~

to require, for certain airplanes, un inspection to ensure Lhatcertain screws are properly

installed, and re-installing longer screws ifneces+y, We ••.e proposing ,his

supplcmemaJ NPRM to prevent damage to the fuel pumps caused by eleclrical arcing tha

"

could introduce an ignition source in the fuel tank[ which, in combination with flammabl

",,1lJ'fC'<Y~

fuel vapors. could result in a fuel tank explosion and consequent loss orthe airplane.

Sinee these actions impose an additional burden over that proposed in the NPRM, we are

."

rcopening the comment period to allow the public the chance to comment on these

proposed changes.

''''TIAl4'~I(;
1491O-13-P}

DEPARTMENT OF TRANSPORTATION ""(l,R"' ''''C~

mo{;s·· ••o,

a-fiM-1I Y:

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[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 of proposeu ruleI makll1g (NPRM); reopenll1g of commen ""A13-";'_HI;"]O ')

12v

period. ,,,"" ~.----

RIN 2120-AA64

Federal Aviation Administration

Airwortbiness Directives; The Boeing Company Model 757 Airplanes

14 CFR Part 39

SUMMARY: We are revising an earlier proposed alrworthiness directive (AD) for the

products listed above. That NPRM proposed replacing the power control relays for the

fuel booS! pumps and override pumps with new relayS having a g,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 by proposing 10 CUTI'ICs)""o<-

require an electrical bonding resistance measurement for certain GFI relays (0 venfy Ihat .Il, ,•••••:1-

certain bonding requirements are met. This actidn also revises thaI NPRM by proposing "oil

to require, Corcertain airplanes, an inspection to ensure that certain screws Hre properly

installed. and fe-installing longer screws if necessary. 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 in the fuel tank, which, in combination with narrunabl'"M===~_

I ",m""'~n"''''

fuel vapors, could result in a fuel tank explosion and consequent loss of the <lirplane.

Since these actions impose an addItional burden over that proposed in the NPRM, we are L.,,- _ k;oll

reopening the comment period to allow the public the chance to comment on these

proposed changes.