### 14910-13-PI OEPARTl\'ll1:NT OF TRANSPORTATION Federal A\"iatiou Administration _llN< ~"~,,<:.(". 

### ,),,,,,..-;~.~~,,,, 14erR Pari 39 [Oockd~o. FAA-2010~02J2; Directorate Identifier 

### 2009-NM-O:n~AD; Amcndmen 

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# c1010-,;l,(o-i DID

191'1 to RIN 2120-..-\A64 ./ 

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### ft:i Airworthiness Directives; The Boeing Company Model 747-200C -lOOF, -400. -4000

# ,/{1;;::;r:;::. and -400F Series Airplanes 

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### ," AGENC'V: Federal Aviation Administration (FAA), Departmenl ofTransport:nioll (DOT). ACTION: Final rule. applies to cct"tain Modd 747-200C. -lOOF. -400. ·400D, and -400F series aillliancs. Tlla' .I'L • AD cllm:ntly requires repetitive inspections for cracks i111he overlapping (upper) skin a 'Aile the upper fastener row of the lap joints of the fuselage skin in sections 41. 42. and 46; rclated investigative and corrective actions, if necessary. This new AD requires 

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# ':"/l'+~ ''':''''''-1'.''.. lap joi Ilts and certain posi-repair inspections of the bp joi 1115.Accomp Iishl11g the length of lnpjoint that is modified. This AD results from a stnlctllral re.view of affccic expanding the inspection arca in the existing AD, and adding a modification of certain modification would end the repetitive inspections required bythe existing AD for the

DATES: This AD hecomes effective [INSERT DATE 35 DA YS A!-l"ER DATE OF -:T:lCKlng in cerl<lilllapjoints, \•• ·hicl1 could resuh in rapid ucpressurii.".atioll o(lhl.: airplan PUBLICATION IN THE FEDERAL REGISTER]. skin lapjoints for widespread fatigue damage. We are issuing this AD to prevent fatigu O<J"",~y"OOl

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# lz. (714910-13-PI DEPARTMENT OF TRANSPORTATION Federal Aviation Administration :ONC"~.["Ct.S O"""GS·''''''O.



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# D.IN,'1,"'11 " 10 

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. . •. ,.•nu.l"""G applies 10certam Model 747-200C, -200F, -400. -400D, and --400Fsenes mrplanes. Th AD curremly requires repetitive inspections forcracks in the overlapping (upper) skin 0 ll' ACTION: Fina! rule. SUMMARY: The FAA is superseding an existing airworthiness directive (AD), which °""''115 ACENCY: Federal Aviation Administration (FAA), Department ofTransportation RlN 2120-.'1..'1.64
(DOT). Ainvartbiness Directives; The Boeing Company Model 747-200C, -lOOF, -400, -400D and -400F Series Airplanes (Docket No. FAA-2010-0232; Directorate Identifier 2009-NM-032-AOj Amendmen 39-**; AD 

## **1 14erR Part 39

the upper fastener row ofthe lapjoints ofthe fuselage skin in sections 41, 42, and 46; a related investigative and corrective actions, ifnecessary. This new AD requires expanding the inspection area inthe existing AD, and adding amodification ofcertain lapjoints and cCI1ainpost-repair inspections orthe lapjoints. Accomplishing the modification \vould end the repetitive illspections required by the existing AD forthe length oflap joint thaI is modified. This AD results from astructural review ofaffecte skin lapjoints for widespread fatigue damage. We arc issuing this AD toprevent fatigu cracking in certain lapjoints, which could result in rapid depressurization ofthe airplan OATES: This AD becomes effective [tNSERT DATE 35 DAYS AFTER DATE OF PUBLlCATION IN THE FEDERAL REGISTER]. JNnlAt.$;'SlC