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AGENCY: Federal Aviation Administration (FAA), Department ofTransportation Federal Aviation Administration

(DOT). ACTION: Notice ofproposed rulemaking (NPRM). Airworthiness Directives; McDOImell Douglas Model DC-8-3I, DC-8-32, DC-8-33, R1N 2120-AA64 DEPARTMENT OF TRANSPORTATION

DC-8-41, DC-8-42, and DC-8-43 Airplanes; Model DC-8-51, DC-8-52, DC-8-53, and DC-8-55 Airplanes; Model DC-8F-54 and DC-8F-55 Airplanes; Model DC-8-61, DC-8-62, and DC-8-63 Airplanes; Model DC-8-61F, DC-8-62F, and DC-8-63F Airplanes; Model DC-8-71, DC-8-72, and DC-8-73 Airplanes; and Model DC-8-71 F, DC-8-72F, and DC-8-73F Airplanes 14CFR ParI 39 

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# q [DocketNo.FAA-20]O~; Directorate Identifier 2009-NM-232-AD)

SUM:MARY: The FAA proposes to supersede anexisting airworthiness directive (AD Nin"I",,'SIG that applies to allMcDonnell Douglas airplanes identified above. The existing AD J)~'r" CU1Tentlyrequires revising the maintenance program toincorporate new aif\vOIihincss "OUTINC.\\'MIIlJL. limitations forfueltank systems to satisfy Special Federal Aviation Regulation No. 88 requirements. This proposed AD would add requirements to revise themaintenance program toincorporate specific Critical Design Configuration Control Limitations omNC S'·"IlQL (CDCCL) information and install fueltank float switch in-line fuses. This proposed would also add acertain Airworthiness Limitations inspection (All). This proposed results from adesign review ofthe fueltank systems. We are proposing this AD to prevent the potential forignition sources inside fueltanks caused by latenl failures, alterations, repairs, ormaintenance actions, which, incombination with flammable fuel ",,'Ie vapors, could result inafueltank:explosion and consequent loss ofthe airplane.14910-13-P] 

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DEPARTMENT OFTRANSPORTATION Federal Aviation Administration 14CFRPart 39 IDocket No. FAA-2010W-++++j Directorate Identifier 2009-NM-232-ADJ R1N 2lZ0-AA64 Ainvorthiness Directives; McDonnell Douglas Model DC-8-3l, DC-8-32, DC-B-33, DC-B-41, DC-8-42, and DC-8-43 Airplanes; Model DC-8-51, DC-8-52, DC-8-53, and DC-8-55 Airplanes; Model DC-SF-54 and DC-SF-55 Airplanes; Model DC-8-61, DC-8-62, and DC·8·63 Airplanes; Model DC-8-6 tF, DC-8-62F, and DC-8-63F Airplanes; Model DC-8-?l, DC-8-72. and DC-8-?3 Airplanes; and Model DC-8-71F, DC-8-72F, and DC-8-73F Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOl). ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: The FAA proposes to supersede an existing airwortbiness directive (AD) that applies to all McDonnell Douglas airplanes identified above. The existing AD currcntly rcquires revising the maintenance program to incorporate new airworthiness limitations for fuel tank systems to satisfy Special Federal Aviation Regulation No. 88 requirements. This proposed AD would retain the requirements ofthe existing AD, and require revising the maintenance program to incorporate specific Critical Design Configuration Control Limitations (CDCCL) information and installing fuel rank float sv.itch in-line fuses. This proposed AD would also add Airworthiness Limitations inspections (ALIs). This proposed AD results from adesign review ofthe fuel tank systems. We are proposing this AD toprevent the potential for ignition sources inside fuel tanks caused by latent failures, alterations, repairs, or maintenance actions, which, in M 

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FAA Form 1360-14.1 (6-89) OFFICIAL FILE COPY