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DEPARTMENT OF TRANSPORT ATION

Federal Aviation Administration

14 CFR Part 39

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Ainvortbiness Directives; The Boeing Company Model 747-400, 747-400D, and NG1:l)-~

IDocket No. FAA-20IO-0035; Directorate Identifier 2009-NM-066-AD; Amendmen A. Ziltri

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39-**; AD *.*1 ;20fO-2.D-i1. 8/10/'0

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DATES: This AD is effective [INSERT DAT9 35 DAYS AFTER DATE OF '1 '~(IO

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 a hot short

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protector (HSP) for the fuel quantity indicating system (FQIS) of the center fuel tank an,~ &

ror certain airplanes, the horizontal stabilizer fubl tank. This AD results from fi.lelsyste ':"~ ,. c

reviews conducted by the manufacturer. We ard issuing this AD Laprevent an electrical WunNc;SYMBOL

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hot short from a source outside the FQIS to the 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, in combination with

Dammable fuel vapors, could result in a fuel tatk explosion and consequent loss of the

ACTION: Final rule.

SUMMARY: We are adopting a new airworthiness directive (AD) for Model 747-400,
[4910-13'1')

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0035; Directorate Identifier 2009-NM-066-AD; Amendmcn

39-*'; AD *']

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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 a new airworthiness directive (AD) for Model 747-400, DATE! !

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747-400D, and 747-400F series airplanes. This 1\D requires installing a hot short ouUn~SYnl"'"

protector (HSP) for the fuel quantity indicating lystem (FQIS) of the center fuel tank a /.,;;: ;:'GG

for certain airplanes, the horizontal stabilizer full tank. This AD results from fuel syste

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reviews conducted by the manufacturer. We are issuing this AD to prevent an electrical RO~17,G SYMBOl

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hot short from a source outside the FQIS to the iiensitometer wiring from causing failur NITIAlSISlG

airplane.

of the FQIS densitometer resistors, which could result in an ignition source inside the

center or horizontal stabilizer fuel tanks. An ignition source, in combination with

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

DATES: This AD is effective [INSERT DATE 35 DAYS AFTER DATE OF

PUBLICATION IN THE FEDERAL REGISTER]. I NIT1AL$1$IG

The Director of the Federal Register app~oved the incorporation by reference of

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certain publication listed in the AD as of [INSERT DATE 35 DAYS AFTER DATE 0

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PUBLICA nON IN THE FEDERAL REGISTER].

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