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DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39 [Docket No. FAA-2009-0454; Directorate Identifier 2008-NM-156-AD; Amendment 

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: l~rnAL.!iSlG RlN 2I20-AA64 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 anew 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 ~Otrf'NG ,YMOOL

corrective actions ifnecessary, and changing the wiring for the center and main fuel tank override/jettison fuel pumps; and, for certain airplanes, installing new relays and wiring INI1HLSISlG

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---- for the horizontal stabilizer override/jettison fuel prunps. This AD also requires arevisio 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 afuel tank. This condition, in combination with flammable fuel vapors, could result in afuel tank explosion and consequent loss of the airplane. 

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Federal Aviation Administration ONCURRENCES ounNe; SYMBOL 14CFR Parl39 I>nnAI.SiSIG [Docket No. FAA-2009-0454j Directorate Identifier 2008-NM-lS6-AD; Amendmen D. 

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# Y-Q..- corrective actions ifnecessary, and changing the wiring for the center and main fuel tan T~ , :(.vJt.(~UJ override/jettison fuelpumps; and, force11ainairplanes, installing new relays and wiring forthe horizontal stabilizer override/jettison fuelpumps. This AD also requires arevisi 747-400F Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Final rule.

tothemaintenance program toincorporate Airworthiness Limitation No. 28-AWL-24 OAT· 

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# 4/2-9/f(J ROUTING SYMBOL installing new pump control and time delay relays, doing related investigative and SUMMARY: We are adopting anew airworthiness directive (AD) for certain Model 747-400, 747-400D, and 747-400F series airplanes. For all airplanes, this AD requires 0" ,OQSymool 

### Skl1AEC Airworthiness Directives; The Boeing Company Model 747-400, 747-400D, and 

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shutoff system for the horizontal stabilizer tank fuel pumps and installing new integrate display system software. This AD results from fuel system reviews conducted bythe manufacturer. We are issuing this AD toprevent uncommanded operation ofcertain 

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OuTING STM80L f. ovelTide/jettison pump~ which could cause overheat, electrical arcs, or frictional sparks, ' INIilAI..$ISIG and could lead to an ignition source inside afuel tank. This condition, in combination with 1'1ammablefuel vapors, could result inafuel tank explosion and consequent loss a OuTING SYM80L the airplane. INmAL5/S1GDEPARTMENT OF TRANSPORTATION

Federal Aviation Administration 14CFR Part 39 -OI"CURR~'KES OUTING SYM60L [Docket No. FAA-2009-0454; Directorate Identifier 2008-NM- I56-AD; Amendmen D.

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## **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 anew 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 ifnecessary, and changing the wiring for the center and main fuel ta override/jenison fuel pumps; and, forcertain airplanes, installing new relays and wiring forthehorizontal stabilizer override/jettison fuelpumps. This AD also requires arevisi tothe maintenance program to incorporate Airworthiness Limitation No. 28-AWL-24 andNo. 28-AWL-26. For certain airplanes, this AD also requires installing an automati 

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shutoff system forthe horizontal stabilizer tank fuelpumps and installing new integrate IIUIAl..S15lG display system software. TIlls AD results from fuel system reviews conducted bythe manufacturer. We are issuing this AD toprevent uncommanded operation ofcertain OUTING SYMllOl. override/jettison pumps which could cause overheat, electrical arcs, orfrictional sparks, / INlflALS/$JG andcould lead to an ignition source inside afuel tank. This condition, incombination withflammable fuel vapors, could result in afuel tank explosion and consequent loss a the airplane. 

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