DEPARTMENT OF TRANSPORTATION 14910-I3-Pj CONCU""fNCE.\ ROuTING

"'''BDL Federal Aviation Administration 14CFR Part 39 

# ,.0j.'" IDocket No. FAA-2009-0866; Directorate Identifier 2009-NM-074-AD; Amendme 

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Airwortbiness Directives; McDonnell Douglas Corporation Model MD-ll and MD-l F

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# i INITrALSlSlG AGENCY: Federal Aviation Administration (FAA), Department ofTrallsp0l1ation (DOT). ACTION: Final mle. SUMMARY: The FAA is superseding an existing airworthiness directive (AD), whicl applies to certain Model :MD-l1 andJ\.1I)-llF airplanes. That AD currently requires a "OUTING SI'M one-time inspection to determine ifmetalbc transitions are installed all wire hamesses f J

the taiItank fuel transfer pumps, and to detemline ifdamaged wires are present; and INITI,\I.s:SIG D,\Tf. repair, ifnecessary. That AD also reqUIresrepetitive inspections ofthe repaired area; a d apermanent modification ofthe wire harnesses ifmetallic transitions are not installed, which would tenninate the repetitive inspections. This new AD requires modifying the case grounding for the alternate fuel pump orthe tail tank, the leak detection themlal switch grounding forthe number 2 engine, and wire braid grounding in the empennage R(lUT'N(I SHII!QL

and number 2 engine inlet. This AD also removes one aiJplane from the applicability 0 ITIAL..'i''''; the existing AD. This AD results £i·omreports that the wire assembly forthe alternate QATE fuel pump ismissing acase ground wire, and the lightning protection wire braid forWil u'tI"GSYMUQL assemblies located inthe empennage and number 2 engine inlet are grounded improper ~:I'I"I-SISIG We are Issuing this AD toprevent insufficient grounding ofthe fuel pump, which in{4910-13-P]

DEPARTMENT OFTRANSPORT AnON Federal Aviation Administration 14CFR Part 39 lDockct No.FAA-2009-0866; Directorate Identitier 2009-NM-074-AD; Amendment 39-**; AD **} RIN 2120-AA64 Ainvorthincss Directives; McDonnell Douglas CorporationModel MD-ll andMD-I1F Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). ACfION: Final rule. SUMJ\!lARY: The FAA is superseding an existing airworthiness directive (AD), which applies to cerrain ModeJ MD-!l and NID-IIF airplanes. That AD currently requires a one-time inspection to determine ifmetallic transitions are installed on wire harnesses of the mil tank fuel transfer pumps, and to determine ifdamaged wires are present; and repair, ifnecessary. This new AD requires modifying the case grounding for the alternate fuel pump ofthe tail tank, the leak detection thermal switch grounding for the number 2 engine, and wire braid grounding in the elllpel11lage and number 2 engine inlet. This AD also removes one airplane from the applicability of the existing AD. This AD results from reports that the wire assembly for the alternate fuel pump is missing acase ground wire, and the lightning prolection \Virebraid for wire assemblies located in the empennage and number 2engine inlet are grounded improperly. We are issuing this AD to prevent insulTicient grounding ofthe fuel pump, which incombination with an elecrrical failure within the fuel pwnp and acompromised electrical bond could cause a fuel tank ignition, resulting in consequent fire or explosion. 

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FAA Form 1360-14.1 (6-89) OFFICIAL FILE COpy ,U,S. ClOVERN!J.ENTPRJNTING OFf'ICE: 1~;5· 799-21'