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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 ofTransportation :O"CURREr<CE5 OUnNG SnI!!Ol j.'-<>I~I

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### tD -22-0~ AC'l'lON S 1 I' f' d 1 k' (NPRM) . j' OUll"G Sy,,1l0L
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# INJ?:Slr'6l SUMMARY: The FAA isrevising an earlier NPRM for an airworthiness directive (AD 

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# 2Zl0j that applies to certain Boeing Model 747 airplanes. The original NPRM would have superseded an existing AD that currently requires repetitive inspections ofthe body station (BS) 2598 bulkhead. and conective actions ifnecessary. The existing AD also currently requires aterminating 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 IrJlT1AtSISIG

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# 1,';~,:lv1 modification, and post-interim modification inspections. For certain airplanes, the ( 'NmAi.SfSIG original NPRM also proposed to require replacing any previously repaired aft inner cho 

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# v~ "" and reinstalling the tenninati.ng modification. The original NPRM resulted f"rolllreports 

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OUTING SYMBOL and repeat intervals of certain post-modification inspections. This new action also revis
- '!: . 'NlTI"i.S,:SH;; 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 14CFR Part 39 " IL IrUTlAlS,ISrc
Ainvorthiness Directives; Boeing Model747 ~irplanes IDocket No. FAA-2008-0981; Directoratc Identifier 2008-NM-073-AD) R1N 2120-AA64 AGENCY: Federal Aviation Administration (FAA), Department ofTransportation
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## 10-ll-O~ OVllr<G S'HBOl ACTION: Supplemental notice ofproposed rulemaking (NPRlvf); reopening of

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# ~, . (J~ l. SUMMARY: The FAA isrevising an earlier NPRM foran 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 ofthe body station (BS) 2598 bulkhead, and corrective actions ifnecessary. The existing AD also currently requires atemlinating modification for therepetitive inspections and a post-modification inspection ofthe modified area. The original NPRM proposed to ""","'-;.2,:.;;,: NmAlSf~ .~ 

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### PriDNrltJ1f::, continue torequire 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. Forcertain 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 ofcracked aft iIUlerchords on airplanes after certain requirements ofthe existing AD 

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## C. N~S~ . were done. This new action revises the original NPR..Mforairplanes that are converted t 

## ll~hY/jh-1 J the Model 747-400 large cargo freightef.(LCF) configuration by reducing the threshold 

# i/) I/ID and repeat intervals ofcertain post-modification inspections. This new action also revis 1'1/1lALSlSIG the original NPRM for all airplanes by proposing that certain inspections ofthe upper a