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### ,:).D\O- ,<-J"'- [Docket No. FAA~-I I I I I; Directorate Identifier 2009-NM-032-AD] R1N 2120-AA64 AilWorthiness Directives; Boeing Model 747-200C, -200F, -400, 

### -4000, and ADOF Series Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). ACTION: Notice of proposed mlemaking (NPRM). SUMMARY: The FAA proposes to supersede an existing airworthiness directive (AD) that applies to certain Boeing Model 747-200C, -200F, -400, -400D, and -400F series airplanes. The existing AD currently requires repetitive inspections for cracks in the overlapping (upper) skin, upper fastener row ofthe lapjoints ofthe fuselage skin in sections 41, 42, and 46; and related investigative and corrective actions, ifnecessary. This proposed AD would expand the inspection area in the existing AD, and add a modification ofcertain lapjoints and certain post-repair inspections ofthe lapjoints. CO)<CU~RENCf:S ROlFIlNG S"',OOI.
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DATE "O\lI'lNG S\'~"<OI. Accomplishing the modification would end the repetitive inspections required by the existing AD forthe length of lapjoint that is modified. This proposed AD results from a ~ .. \TE structural review ofaffected skin lapjoints for widespread fatigue damage. We are proposing this AD to detect and correct fatigue cracking in certain lapjoints, which caul result in rapid depressurization ofthe airplane. DATES: We must receive comments on this proposed AD by [insel1 date 45 days after date ofpublication in the FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods:
• Federal eRuJemaking Portal: Go to http://www.regulations.gov. Follow the "oun"G SYMLlOl
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overlapping (upper) skin, upper fastener row ofthe lapjoints ofthe fuselage skin in airplanes. The existing AD currently requires repetitive inspections for cracks in the AGENCY: Federal Aviation Administration (FAA), Department ofTransportation [Docket No. FA...<\-2009-1I I I !;Directorate Identifier 2009-NM-032-AD] RIN 2120-AA64

ACTION: Notice ofproposed rulemaking (NPRM). (. 

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### -4000, and -400F series (DOT). Ainvorthiness Directives; Boeing Model 747-200C, -200F, -400, -4000, and -400F Series Airplanes 14 CFR Part 39

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result in rapid depressurization ofthe airplane. DATES: We must receive comments on this proposed AD by [insert date 45 days after date ofpublication in the FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods: QVnl'lG sYMBOL

• Federal eRulernaking Portal: Go to http://www.regulations.gov. Follow the l"mAL.SISIG[4910-13-U]

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14eFR 

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# 11- that applies to certain Boeing Model 747-200C, -200F, -400, -400D, and -400F series overlapping (upper) skin, upper fastener fOW ofthe lapjQints ofthe fuselage skin in (J sections 41, 42, and 46; and related investigative and corrective actions, ifnecessary. This proposed AD would expand the inspection area in the existing AD, and add a modification ofcertain lapjoints apd certain post-repair inspections ofthe lapjoints. Accomplishing the modification would end the repetitive inspections required by the existing AD forthe lengUIoflapjoint that is modified, This proposed AD results from structural review of affected skin lapjoints for widespread fatigue damage. We are proposing this AD to detect and correct fatigue cracking in certain lapjoints, which co result in rapid depressurization ofthe airplane. DATES: We must receive comments on this proposed AD by [insert date 45 days after 

### , date ofpublication inthe FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods:
• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the