[4910-13-P]

14 CFR Part 39

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

O:J-75

[Docket No. FAA-201O-1 I I I I; Directorate Identifier 2009-NM-231-AD]

RlN 2120-AA64

Airworthiness Directivesj The Boeing Company Model 747-100, 747-100B,

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and 747SP Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400F, 747SR,

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Mode - 101

747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-40 :r~

747-400F, 747SR, and 747SP series airplanes. This proposed AD would require

reworking certain duct assemblies in the environmental control system (ECS). This

proposed AD results from reports of duct assemblies in the ECS with burned Boeing

Material Specification (EMS) 8-39 polyurethane foam insulation. This proposed AD als

results from a report from the airplane manufacturer that airplanes were assembled with

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duct assemblies in the ECS \\iTapped with BMS 8-39 polyurethane foam insulation, a

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material of which the fire retardant properties deteriorate with age. We are proposing thi P,\Tli

AD to prevent a potential electrical arc from igniting the BMS 8-39 polyurethane foam .(jUTI~GS\·MB(j1.-

insulation on the duct assemblies of the ECS, which could propagate a small fire and lea '~ITI,",'"SIG

to a larger fire that might spread throughout the airplane through the ECS.

DATES: We must receive comments on this proposed AD by [insert date 45 days after RQlJTING SYMBOL

date of publication in the FEDERAL REGISTER]. JNIl'IAlS;S,(;

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14910-I3-PI

DEPARTMENT OF TRANSPORT AnON

Fedel"3l Aviation Administration

14 CFR Part 39

{Docket No. FAA-2010-1 I I I I; Directorate Identifier 2009-NM-231-AD)

RIN 2120-AA64

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Airworthiness Directives; The Boeing Company Model 747-100, 747-1008, Ih,.XJl~I~

747-IOOB SUO, 747-200B, 747-200C, 747-200F,'747-300, 747-400, 747-400F, 747SR, ,"ne~;:l~l\

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and 747SP Series Airplanes DATe

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AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of propo~ed rulemaking (NPRM).

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Material Specification (BMS) 8-39 polyurethane foam insulation. This proposed AD al

results from a report from the airplane manufacturer that airplanes were assembled with

duct assemblies in the ECS wrapped with BMS 8~39 polyurethane foam insulation, a

747-400F, 747SR, and 747SP series airplanes. This proposed AD would require

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Mod ,.•.

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747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300,747-40, ,-

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reworking certain duct assemblies in the environmental control system (ECS). Thij;

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..:. proposed AD results from reports of-duct assemblies in the ECS with\.bu~ Boeing

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material of which the flre retardant properties deteriorate with age. We are proposing

AD to prevent a potential electrical arc from igniting the BMS 8-39 polyurethane foam

insulation on the duct assemblies of the ECS, which could propagate a small fire and Ie

to a larger fire that might spread throughout the airplane through the ECS.

DATES: We must receive comments on this proposed AD by [insert date 45 days after

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date of publication in the FEDERAL REGISTER].
[4910-13-PJ

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

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[Docket No. FAA-2010-+++++; Directorate Identifier 2009-NM-23I-ADj

RlN 2120-AA64

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Ainvorthiness Directives; The Boeing Company Model747~100, 747-100B, ~n-J.3JsEm

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747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400F, 747SR, e.-.,w\

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~" and 747SP Series Airplanes

14 CFR Part 39

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OIfTlNG sYMBOL AGENCY: Federal Aviation Administration (FAA), DOT.

747-400F, 747SR, and 747SP series airplanes. This proposed AD would require

ACTION: Nolice of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Mod t"

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747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-40 """",m.'

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Material Specification (BMS) 8-39 polyurethane foam insulation. This proposed AD al

reworking certain duct assemblies in the environmental control system (ECS). This

proposed AD results from reports of duct assemblies in the ECS with burned Boeing

results from a report from the airplane manufacturer that airplanes were assembled with ATE

duct assemblies in the ECS wrapped with BMS 8-39 polyurethane foam insulation, a

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material of which the fire retardant properties deteriorate with age. We are proposing t is I SO S O.E NInAlS/SIG

AD to prevent a potential electrical arc from igniting the BMS 8-39 polyurethane foam b.

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insulation on the duct assemblies of the ECS, which could propagate a small fire and Ie d 2... b/ro

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to a larger fire that might spread throughout the airplane through the ECS.

DATES: We must receive comments on this proposed AD by [insert date 45 days after

date of publication in the FEDERAL REGISTER].

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