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DEPARTMENT OF TRANSPORT ATION Federal Aviation Administration 14CFR Part 39

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# NG1:l)-~ Ainvortbiness Directives; The Boeing Company Model 747-400, 747-400D, and IDocket No. FAA-20IO-0035; Directorate Identifier 2009-NM-066-AD; Amendmen 

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# '1 '~(IO DATES: This AD is effective [INSERT DAT9 35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. airplane.

PUBLICATION IN THE FEDERAL REGISTER]. 747-400F Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT.

747-4000, and 747-400F series airplanes. This AD requires installing ahot short 5"". . IeG"(. protector (HSP) for the fuel quantity indicating system (FQIS) ofthe center fuel tank an,~ 

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rorcertain airplanes, the horizontal stabilizer fubl tank. This AD results from fi.lelsyste ':"~ ,. c reviews conducted by the manufacturer. We

# ard issuing this AD Laprevent anelectrical WunNc;SYMBOL I A/J -100.5 hot short from a source outside the FQIS tothe iensitometer wiring from causing failur N t.S G oCthe fQJS densitometer resistors, which could result in an ignition source inside the center or horizontal stabilizer fuel tanks. An igJitiOl1source, incombination with Dammable fuel vapors, could result in a fueltatk explosion and consequent loss ofthe ACTION: Final rule. SUMMARY: We are adopting anew airworthiness directive (AD) for Model 747-400,[4910-13'1')

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39 [Docket No. FAA-2010-0035; Directorate Identifier 2009-NM-066-AD; Amendmcn 39-*'; AD *'] 

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R JTINS SYMBOl Ainvorthincss Directivesj The Boeing Camp y Model 747-400, 747-400D, and 747-400F Series Airplanes AGENCY: Federal Aviation Administration (F!A.A),DOT. RlN 2120-AA64

ACTION: Final rule. SUMMARY: We are adopting anew airworthiness directive (AD) for Model 747-400, DATE! 

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## to 747-400D, and 747-400F series airplanes. This 1\D requires installing ahot short ouUn~SYnl"'" protector (HSP) for the fuel quantity indicating lystem (FQIS) ofthe center fuel tank a /.,;;:

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# d reviews conducted by the manufacturer. We are issuing this AD toprevent an electrical RO~17,G SYMBOl h"f'l',-[onS hot short from asource outside theFQIS tothe iiensitometer wiring from causing failur NITIAlSISlG

airplane. oftheFQIS densitometer resistors, which could result in an ignition source inside the center orhorizontal stabilizer fuel tanks. An ignition source, incombination with flammable fuel vapors, could result in afuel tank explosion and consequent loss ofthe
DATES: This AD is effective [INSERT DATE 35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. I NIT1AL$1$IG The Director ofthe Federal Register app~oved the incorporation by reference of
_, I Al'e certain publication listed in the AD as of [INSERT DATE 35 DAYS AFTER DATE 

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