### [4910-13-P DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration 

### .14CFR Part 39 [Docket No. FAA-2008-0847; Directorate Identifier 2008-NM-OS6-AD] RIN 2120-AA64 Airworthiness Directivesj 

### TheBoeing Company Model 777-200, -200LR, -300, and -30GERSeries Airplanes AGENCY: 

### Federal Aviation Administration (FAA), DOT. ACTION: 

### Supplemental notice ofproposed ruJemaklng (NPRM); reopening of COffim 

### period. SUMMARY: 

### We arerevising anearlier proposed airworthmess directive (AD) for certain Model 777-200, -200LR, -300, and -30GERseries airplanes. The original NP would have reqUiTeddoing aninspection toidentify thepart number ofthe motor operated valve (MOY) actuators ofthe main and center fuel tanks; replacing certain MOV actuators with new MOY actuators; and measuring th~electrical resl:;tancc orthe bond fromthe adapter plate totheairplane structure, and doing corrective actions if necessary. The original NPRM also would have required revising theAirworthiness :UN~"1J.K ·ES ROUrrNG S't'M"ClL 

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### Limitations section oftbe Instnlctions forContinued AiIworthincss. The original NPR

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### resulted from fuelsystem reviews conducted by

### themanufacturer. This action revises t 1 

### original NPRM by 

### adding airplanes totheapplicability. This action also revises the
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### original NPRM byremoving tbe requirement forrevising the Airworthiness Lilllitationr
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### section oftbe Instructions forContinued Ainvorthiness. We areproposing this

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### supplemental NPRM toprevent electncal current from flowmg through anMOY actuat r into afueltank, which could create apotential ignition source inside the fuel tank. ThiJ 1~I'rIAL.s •. "G 

### condition, incombination with flammab1e fuel vapors, could result in afuel tank explosion and consequent loss ofthe airplane. IMTE14910-13-PI DEPARTMENT OFTRANSPORTATION

period. RlN 2120-AA64 

### 14erR Pad 

### 39

lH;ccssary. The original NPR1V1also \vould have required revising the Ainvotthiness Limitation,') section ofthe Instructions for Continued Airworthiness. The original NP
anginal NPRM by addlng airplanes to the appli.cability. This action also revises the resultcd from fuel system reviews conducted by the manufacturer. This action revises

explosion and consequent loss ofthe airplane. bond from the adapter plate to the airplane structure, and doing corrective actions if l\:tOVactuators with new MOV actuators; and measuring the_electrical resistance ofi \\'ould have required doing an inspection to identify the part number of the molor operated valve (MOV) actuators ofthe main and center 

### fuel tanks; replacing certain certain Model 777-200. -200LR, -300, and -300ER series airplanes. The original NP IDocket No. FAA-2008-0847; Directorate Identifier 2008-NM-056-ADI Federal Aviation Administration

ACTION: SupplementaJ notice ofproposed rulemaking (NPRM); reopening ofcomn -:JOOERSeries AIrplanes AGENCY: Federal Aviation Administration (FAA), DOT. Ainvolothiness Directives; The Boeing Company Model 777-200, -200LR, -300, and

SUM1\1.ARY: We are revising an earlier proposed airworthiness directive (AD) for

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# .T'" "'I original NPRM by removing therequirement forrevising theAirworthiness Limitatio sc-etionofthe Instructions for Cominued Airworthiness. We are proposing this jS'tMaOL "'rw..5i51C supplemental 

### NPRlvl. to prevent electrical current from flowing through an MOV actu 

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# "[ into afuel tank, which could create apotential ignition source inside the fuel tank. Th s 

# ~I~~~ condition, incombination with flammable fuel vapors, could result in a fucltank 

# "1'" "I14910-J3-PI DEPARTMENT OF TR>\NSPORTA nON Federal Aviation Administration 14CFR Part 39 IDocket No. FAA-2008-0847; Directorate Identifier 2008-NM-056-AD] RIN 2120-AA64 Airworthiness Directives; The Boeing Company Model 777-200, ~200LR, -300, and -30GER Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Supplemental notice ofproposed mlemaking (NPRM); reopening ofcomn period. SUl\<IMARY: We are revising an earlier proposed air\\'orthiness directive (AD) for certain Model 777-200, -200LR, -300. and -3aGER series airplanes. The original NP would have required doing an inspection to identify the part number ofthe motor operated valve (MOV) actuators ofthe main and center fuel tanks; replacing certain MOY actuators with new MOV actuators; and measuring the electrical resistance of t bond from the adapter plate to the airplane structure, and doing con"ective actions if necessary. The original NPRM also would have required revising the Airworthiness Limitations section ofthe Instructions for Continued Airworthiness. The original NP resulted from fuel system reviews conducted by the manufacturer. This action revises original NPRM by adding airplanes to the applicability. This action also revises the original NPRM byremoving the requirement for revising the Ai.l"\\lorthincss Limitario section ofthe Instructions for Continued Airworthiness. We are proposing this 

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supplemental NPRM to prevent electrical current from flowing through an MOV actu 

### " into afuel lank, which could create a~tential ignition source inside the fuel tank. Th condition, in combination \'Irithnammable fuel vapors, could result in a fuel tank explosion and consequent Joss ofthe airplane. 

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