[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 The Boeing Company Model 777-200, -200LR, -300, and

-30GER Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Supplemental notice of proposed ruJemaklng (NPRM); reopening of COffim

period.

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

certain Model 777-200, -200LR, -300, and -30GER series airplanes. The original NP

would have reqUiTeddoing an inspection to identify the part number of the 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 from the adapter plate to the airplane structure, and doing corrective actions if

necessary. The original NPRM also would have required revising the Airworthiness

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Limitations section oftbe Instnlctions for Continued AiIworthincss. The original NPR

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resulted from fuel system reviews conducted by the manufacturer. This action revises t 1

original NPRM by adding airplanes to the applicability. This action also revises the

INITIAE.S-''1G

original NPRM by removing tbe requirement for revising the Airworthiness Lilllitationr

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section oftbe Instructions for Continued Ainvorthiness. We are proposing this

. • _ I\OlJllNGSYMOOL supplemental NPRM to prevent electncal current from flowmg through an MOY actuat r

into a fuel tank, which could create a potential ignition source inside the fuel tank. ThiJ 1~I'rIAL.s•."G

condition, in combination with flammab1e fuel vapors, could result in a fuel tank

explosion and consequent loss of the airplane.

IMTE
14910-13-PI

DEPARTMENT OF TRANSPORTATION

period.

RlN 2120-AA64

14erR Pad 39

lH;ccssary. The original NPR1V1also \vould have required revising the Ainvotthiness

Limitation,') section of the 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 of the airplane.

bond from the adapter plate to the airplane structure, and doing corrective actions if

l\:tOV actuators 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 of the 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 of proposed 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

llfSV'l/lOi.

.T'"

"'I original NPRM by removing the requirement for revising the Airworthiness Limitatio

sc-etion of the Instructions for Cominued Airworthiness. We are proposing this jS'tMaOL

"'rw..5i51C

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

into a fuel tank, which could create a potential ignition source inside the fuel tank. Th s"[

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condition, in combination with flammable fuel vapors, could result in a fucltank

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"I
14910-J3-PI

DEPARTMENT OF TR>\NSPORTA nON

Federal Aviation Administration

14 CFR 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 of proposed mlemaking (NPRM); reopening of comn

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 of the motor

operated valve (MOV) actuators of the 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 of the 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 by removing the requirement for revising the Ai.l"\\lorthincss Limitario

section of the Instructions for Continued Airworthiness. We are proposing this

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

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into a fuel lank, which could create a ~tential ignition source inside the fuel tank. Th

condition, in combination \'Irith nammable fuel vapors, could result in a fuel tank

explosion and consequent Joss of the airplane.

"'I

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