14910-13-PI DEPARTMENT OF TR<I-"ISPORTATION 

### Federal Aviation Administration 14 CFR Part 39 IJlmp,LSlS1G 

### (l)ocket No. FAA-2009-0906j Directorate Identifier2009-NM-075-ADj Amendmen 

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# J~~~JAD **120/0-12:'-/2. RIN 2120-AA64 A10!l1-j"{6 

### t Ainvorthiness Directivesj The Boeing Company Model 747-100, 747-1 OOB,747-1 OOBIJlITIA~SIG 

# I G.p~.(r~ SUO, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-4000, 747-400F, 747S '" ,/ .", /'
. >010 and 747SP Series Airplanes ovnNG SV"BO~ .~.Jn1- J

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## - \00 DATES: This AD is effective [INSERT DATE 35 DAYS AFTER DATE OF PUBLICATION IN THE FEDERAL REGISTER]. to prevent damage to the fuel pumps caused by electrical arcing that could introduce an ignition source in the fuel tank, which, in combination with flammable fuel vapors, coul result in a fuel tank explosion and consequent loss of the airp!ane. results from fuel system reviews conducted by the manufacturer. We are issuing this A with new relays having a ground fault interrupt (GFI) feature. This AD also requires fuel boost pumps and jettison pumps, and the center tank scavenge pump, as applicable,

28-A WL-23 (for Model 747-100, 747-] OOB,747-100B SUD, 747-200B, 747-200C, I 747-200F, 747-300, 747SP, and 747SR series aU-planes), and AWLs 28-A WL-28 and 28-A WL-29 (for Model 747-400, 747-4000, and 747-400F series airplanes). This AD series airplanes. This AD requires replacing the power control relays for the main tank ACTION: Final rule. ~", /. /, 

### "1/23 '0 SUMMARY: We are adopting anew airworthiness directive (AD) for certain Model 74 """"115_ 

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revising the maintenance program to incorporate Airworthiness Limitations (AWLs) AGENCY: Federal Aviation Administration (FAA), DOT.

### (4910-13-PI

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39
39-**; AD **1 RIN 2120-AA64 IWflNGSYM60L 

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# e Ain'l'orthiness Directives; The Boeing Company Model 747-100, 747-1OOB,747~lOOBTmA~SIG

### G.pl.tu.-aSUD, 747-2008, 747-200C, 747-200F, 747-300, 747-400, 747-400D, 747-400F, 747SR ~"

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### and 747SP Series Airplanes OU11NGsYM60L 

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fuel boost pumps 

### andjettison pumps, 

### and thecenter tank scavenge pump, 

### as applicable, with new

### relays having aground fault interrupt (GFI) feature. This AD also requires revising the maintenance program toincorporate Airworthiness Limitations (AWLs) AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Finalrule. SUMMARY: We are adopting anew airworthiness directive (AD) forcertain Model 7 series airplanes. This AD requires replacing thepower control relays forthe main tank

28-AWL-23 (forModel 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747SP, and 747SR series airplanes), andAWLs 28-AWL-28 and 28-AWL-29 (forModel 747-400, 747-400D, and 747-400F series airplanes). This AD results from fuelsystem reviews conducted by

### the manufacturer. We are issuing this toprevent damage tothe fuelpumps caused byelectrical arcing that could introduce an OVONG sy••aOl. ~1t()) 

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ignition source inthe fuel tank, which, incombination with flammable fuel vapors, coul result inafuel tank explosion and consequent loss ofthe airplane. DATES: This AD iselIective [INSERT,DATE 35 DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. NmAlSISIC