14 CFR Part 39

[4910-13-P]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

0<.1J...

[Docket No. FAA-2010-++++; Directorate Identifier 2010-NM-047-AD]

RfN 2120-AA64

Airworthiness Directivesj McDOlmeli Douglas Corporation Model DC-l 0-10,

DC-IO-IOF, DC-lO-30, DC-IO-30F (KDC-lO), DC-IO-40, and DC-lO-40F Airplanes

AGENCY: Federal Aviation Administration (FtAl, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airwokhiness directive (AD) for certain Mode

DC-IO-IO, DC-IO-IOF, DC-IO-30, DC-lO-30F ~KDC-lO), DC-lO-40, and DC-IO-40F

airplanes. This proposed AD would require ins+ling a support bracket and coupler on

the left and right wing-ta-fuselage transition, and metallic overbraid on the left and right

leading edge wire assembly. This proposed AD ~esults from fuel system reviews

conducted by the manufacturer, as well as repoJs that the fuel quantity system was

affected by lightning-induced transients. We arelproPosing this AD to prevent lightninginduced transients to the fuel quantity irrdicatioJ system, which could cause voltage

levels to go beyond original design levels betweln fuel tank probes and structure, and

become a potential ignition source at tbe fuel tat, which, in combination with

flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the

airplane,

DATES: W'e must receive comments on this priPosed AD by [INSERT DATE 45

DAYS AFTER DATE OF PUBLICATION TNTHE FEDERAL REGISTER].

ADDRESSES: You may send comments by anJ of the following methods:

• Federal eRulemalGng Portal: Go to httJ:!!Wwv.,r.reguJationS,gOv,Follow the

instructions for submitting comments.

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[4910-13-P)

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-++++j Directorate Identifier ZOlO-NM-047-AD]

RIN 2120-AA64

Airworthiness Directives; McDonnell Douglas Corporation Model DC-l 0-10,

DC-I O-IOF, DC-IO-30, DC-I 0-30F (KDC-IO), DC-IO-40 and DC-l0-40F Aicplanes

AGENCY: Federal Aviation Administration (FAA.), DOl

ACTION: Notice of proposed rulemaking (NPRM). J

SUMMARY: We propose to adopt a new airworthiness !rective '(AD) for certain ~odel

DC-IO-IO, DC-IO-IOF, DC-IO-30, DC-IO-30F (KDC-IO)r DC-I 0-40, and DC-IO-40F

airplanes. This proposed AD would require installing a SUfPort bracket and coupler on

the l~ft and ng~t wmg-to-fusela~e transition, and metallicioverbfmd on the l~ft and nght

leading edge wue assembly. This proposed AD results ff

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mfuel system reviews

conducted by the manufacturer, as well as reports that the fuel quantity system was

affected by lightning-induced tTansients. We are proposin' thi.s AD to prevent 1ightning~

induced tcansients to the fuel quantity indication system, thieh could cause voltage

levels to go beyond original design levels between fuel tafk probes and structure, and

become a potential ignition source at the fuel tank, whichJ in combination with

flammable fuel vapors, could result in a fuel tank eXPlOSi11nand consequent loss of the

airplane.

DATES: We must receive comments on this proposed AID by [INSERT DATE 45

DAYS AFTER DATE OF PUBLICA nON TN THE FEDbRAL REGISTER].

ADDRESSES: You_may send comments by any of the fdUoWing methods:

• Federal eRulemaking Portal: Go to http://www.1gUlarions.gOv. Follow the

instTuctions for submitting comments.

INITIAl.SISITTU~~

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FAA Form 1360-14.1 (6-89)

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OFFICIAL FILE COPY