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DEPARTMENT OF TRANSPORTA nON

Fedt'ral Aviation Administration

14 CFR Part 39

IDocket No. FAA-2008-0981; Directorate Identifier 2008-NM-073-ADl

IUN 2120-AA64

Ainvorthiness Directives; Boeing Model 747 Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of Transportation

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AC'l'lON S 1 I' f' d 1 k' (NPRM) . j' OUll"G Sy,,1l0L

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SUMMARY: The FAA is revising an earlier NPRM for an airworthiness directive (AD D7c 2Zl0j

that applies to certain Boeing Model 747 airplanes. The original NPRM would have

superseded an existing AD that currently requires repetitive inspections of the body

station (BS) 2598 bulkhead. and conective actions if necessary. The existing AD also

currently requires a terminating modification for the repetitive inspections and a

post-modification inspection of the modified area. The original NPRM proposed to

continue to require those actions using revised service information. For certain airplane

the original NPRM proposed to require new repetitive inspections, an interim

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modification, and post-interim modification inspections. For certain airplanes, the (

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original NPRM also proposed to require replacing any previously repaired aft inner cho 0·v~

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and reinstalling the tenninati.ng modification. The original NPRM resulted f"rolllreports (I/-V'//'!J"

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and repeat intervals of certain post-modification inspections. This new action also revis - '!:.

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the original NPRM for all airplanes by proposing that certain inspections of the upper a , . J?
14910-I3-U]

DEPARTMENT OF TRANSPORT AnON

Federal Aviation Administration

14 CFR Part 39

IrUTlAlS,ISrc " IL

Ainvorthiness Directives; Boeing Model 747 ~irplanes

IDocket No. FAA-2008-0981; Directoratc Identifier 2008-NM-073-AD)

R1N 2120-AA64

AGENCY: Federal Aviation Administration (FAA), Department of Transportation

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ACTION: Supplemental notice of proposed rulemaking (NPRlvf); reopening of camme P/'v'lfl-J 105

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SUMMARY: The FAA is revising an earlier NPRM for an airworthiness directive (AD OA/~

that applies to certain Boeing ModeJ 747 airplanes. The original NPRM would have ""'"'95.,.,_

superseded an existing AD that currently requires repetitive inspections of the body

station (BS) 2598 bulkhead, and corrective actions if necessary. The existing AD also

currently requires a temlinating modification for the repetitive inspections and a

post-modification inspection of the modified area. The original NPRM proposed to

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continue to require those actions using revised service information. For certain auplane Alt

the original NPRM proposed to require new repetitive inspections, an interim O\Jl1~G~Y"'~OL

modification, and post-interim modification inspections. For certain airplanes, the

original NPRM also proposed to require replacing any previously repaired aft inner cho

and reinstalling the terminating modification. The original NPRM resulted from reports

of cracked aft iIUlerchords on airplanes after certain requirements of the existing AD -IC .

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were done. This new action revises the original NPR..Mfor airplanes that are converted t ll~hY/jh-1J

the Model 747-400 large cargo freightef.(LCF) configuration by reducing the threshold i/)I/ID

and repeat intervals of certain post-modification inspections. This new action also revis

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the original NPRM for all airplanes by proposing that certain inspections of the upper a