### 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 ofproposed rulemaking (NPRM). SUMMARY: We propose to adopt anew 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 asupport 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 bythe manufacturer, as well asrepoJs that the fuel quantity system was affected by lightning-induced transients. We arelproPosing this AD to prevent lightninginduced transients tothe fuel quantity irrdicatioJ system, which could cause voltage levels to gobeyond original design levels betweln fuel tank probes and structure, and become apotential ignition source attbe fuel tat, which, in combination with flammable fuel vapors, could result inafuel tank explosion and consequent loss ofthe airplane, DATES: W'emust receive comments on this priPosed AD by [INSERT DATE 45 DAYS AFTER DATE OFPUBLICATION TNTHE FEDERAL REGISTER]. ADDRESSES: You may send comments by anJ ofthe following methods:
• Federal eRulemalGng Portal: Go to httJ:!!Wwv.,r.reguJationS,gOv,Follow the instructions for submitting comments. "NW.ReNeES 11.OlmNG 'YMIlO'- 

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### DEPARTMENT OF TRANSPORT AnON Federal Aviation Administration 14CFR 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 ofproposed rulemaking (NPRM). 

# J SUMMARY: We propose to adopt anew 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~ftand ng~t wmg-to-fusela~e transition, and metallicioverbfmd onthe l~ftandnght leading edge wue assembly. This proposed AD results ff

# 1 m fuel system reviews conducted bythe manufacturer, as well as reports that the fuel quantity system was affected by lightning-induced tTansients. We are proposin' thi.sAD 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 apotential ignition source at the fuel tank, whichJ in combination with flammable fuel vapors, could result in afuel tank eXPlOSi11n and consequent loss ofthe airplane. DATES: We must receive comments onthis proposed AID by [INSERT DATE 45 DAYS AFTER DATE OF PUBLICA nON TNTHE FEDbRAL REGISTER]. ADDRESSES: You_may send comments by any ofthe 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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