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Ajnvorthiness Directives; The

# loeLng Company Model 737-600, -700, -70De, -800, and -900 Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed ruJemaking (NPRM). . SUMMARY: We propose to sUPfrsede an existing airworthiness directive (AD) that applies to the products listed

# abOr' The existing AD currently requires replacement of the power control relays inthe P9

11 and P92 power distribution panels forthe fuel boost and override pumps with new, improved relays having aground fault interrupter (GFI) feature, or installation and maintcrance ofuniversal fault interrupters (UFls) using a certain supplemental type certificate. Since we issued that AD, we have determined that weneed to clarify which relays nJaybereplaced by installation ofUFIs. This proposed AD would continue to require th1 actions ofthe existing AD and also specify which relays may be replaced by GFls or UFls. We areproposing this AD to prevent pump housing burn-through due toele+ical arcing, which could create apotential ignition source inside afuel tank. This condition, incombination with flammable fuel vapors, could result in afuel tank exPlosihn and consequent loss ofthe airplane. DATES: We must receive comn+lts onthis proposed AD by [INSERT DATE 45 DAYS AFTER DATE OF PUBL CATION INTHE FEDERAL REGISTER]. DEPARTMENT OF TRANSPiRTA TION Federal Aviation Administratior 14CFR Part 39 

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DEPARTMENT OFTRANSPORTATION Federal Aviation Administration 14CFR Part 39 (Docket No. FA

... .o\-2010-++++; Directorate Identifier 2010-NM-225- . .:\.Dj RlN 2120-AA64 Airworthiness Directives; The

# Bleing Company Model 737-600. -700, -700C, -800, and -900 Series Airplanes AGENCY: Federal Aviation Administration (F.M), DOT. ACTION: Totice of proposedruliaking (NPRM). SUMMARY: Wepropose to supe!Sede anexisting airworthiness directive (AD) that applies to the products listed abovd. The existing AD currently requires replacement of the power control relays in the P91 and P92 power distribution panels for the fuel boost and override pumps with new, Ilnproved relays having a ground fault interrupter (GFI) feature, or installation and maintenrce ofun;versal fault inlCnUjlters (UFls) using a cCltain supplemental type certi

# ncar, Since we issued that AD, we have determined that we need to clarify which relays m be replaced by installation of UFIs. This proposed AD would continue to require the clions orthe existing AD and also specify which 

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housing bum-through due to electr cal arcing, which could create apotential ignition source inside a fuel tank. This COll

# l itlon,in combination with nammable fuel vapors, could result in a fuel tank eXPIOSiOr and consequent loss of the airplane. DATES: We must receive comments on this proposed AD by [L"JSERT DATE 4S DAYS AFTER DATE OF PUBLI~A nON [NTHE FEDERAL REGISTER]. ADDRESSES: You may send COl~Jl1enlSby any orthe following methods: 

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## '" //// /'0 Is. We are proposing this AD to prevent pump relays may be replaced by GFrs or