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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2009-0454; Directorate Identifier 2008-NM-156-AD; Amendment Ut /7 10

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Airworthiness Directives; The Boeing Company Model 747-400, 747-400D, and

747-400F Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final mle.

SUMMARY: We are adopting a new airworthiness directive (AD) for certain Model

747-400, 747-400D, and 747-400F series airplanes. For all airplanes, this AD requires

installing new pump control and time delay relays, doing related investigative and

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corrective actions if necessary, and changing the wiring for the center and main fuel tank

override/jettison fuel pumps; and, for certain airplanes, installing new relays and wiring

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for the horizontal stabilizer override/jettison fuel prunps. This AD also requires a revisio

to the maintenance program to incorporate Airworthiness Limitation No. 28-AWL-24

and No. 28-A WL-26. For certain airplanes, this AD also requires installing an automatic INlTlm'SJG

shutoff system for the horizontal stabilizer tank fuel pumps and installing new integrated Dm

display system software. Illis AD results from fuel system reviews conducted by the

manufacturer. We are issuing this AD to prevent uncommanded operation of certain

override/jettison pumps which could cause overheat, electrical arcs, or frictional sparks,

and could lead to an ignition source inside a fuel tank. This condition, in combination

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

the airplane.

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration ONCURRENCES

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14 CFR Parl39

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corrective actions if necessary, and changing the wiring for the center and main fuel tan T~ ,

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override/jettison fuel pumps; and, for ce11ainairplanes, installing new relays and wiring

for the horizontal stabilizer override/jettison fuel pumps. This AD also requires a revisi

747-400F Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

to the maintenance program to incorporate Airworthiness Limitation No. 28-A WL-24 OAT· J

and No. 28-A WL-26. For certain airplanes, this AD also requires installing an automati 4/2-9/f(J ROUTING SYMBOL

installing new pump control and time delay relays, doing related investigative and

SUMMARY: We are adopting a new airworthiness directive (AD) for certain Model

747-400, 747-400D, and 747-400F series airplanes. For all airplanes, this AD requires 0" ,OQ Symool

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Airworthiness Directives; The Boeing Company Model 747-400, 747-400D, and

39_H; AD H)

RIN 2120-AA64

shutoff system for the horizontal stabilizer tank fuel pumps and installing new integrate

display system software. This AD results from fuel system reviews conducted by the

manufacturer. We are issuing this AD to prevent uncommanded operation of certain

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f. ovelTide/jettison pump~ which could cause overheat, electrical arcs, or frictional sparks, '

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and could lead to an ignition source inside a fuel tank. This condition, in combination

with 1'1ammablefuel vapors, could result in a fuel tank explosion and consequent loss a

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the airplane.

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

-OI"CURR~'KES

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[Docket No. FAA-2009-0454; Directorate Identifier 2008-NM- I56-AD; Amendmen D. w; J '0,)

39-*"; AD **1

RIN 2I20-AA64

Ain\'orthiness Directives; The Boeing Company Model 747-400, 747-400D, and

747-400F Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

SUMMARY: We are adopting a new airworthiness directive (AD) for certain ModeJ

747-400, 747-400D, and 747-400F series airplanes. For all airplanes, this AD requires

installing new pump control and time delay relays, doing related investigative and

corrective actions if necessary, and changing the wiring for the center and main fuel ta

override/jenison fuel pumps; and, for certain airplanes, installing new relays and wiring

for the horizontal stabilizer override/jettison fuel pumps. This AD also requires a revisi

to the maintenance program to incorporate Airworthiness Limitation No. 28-A WL-24

and No. 28-A WL-26. For certain airplanes, this AD also requires installing an automati

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shutoff system for the horizontal stabilizer tank fuel pumps and installing new integrate

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display system software. TIlls AD results from fuel system reviews conducted by the

manufacturer. We are issuing this AD to prevent uncommanded operation of certain

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override/jettison pumps which could cause overheat, electrical arcs, or frictional sparks,

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and could lead to an ignition source inside a fuel tank. This condition, in combination

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

the airplane.

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