14910-13-PI

OEPARTl\'ll1:NT OF TRANSPORTATION

Federal A\"iatiou Administration _llN< ~"~,,<:.(". ,),,,,,..-;~.~~,,,,

14 erR Pari 39

[Oockd~o. FAA-2010~02J2; Directorate Identifier 2009-NM-O:n~AD; Amcndmen 'D.w,l;on

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39-*",AD*"1 c1010-,;l,(o-i DID

191'1 to

RIN 2120-..-\A64 ./ W

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Airworthiness Directives; The Boeing Company Model 747-200C -lOOF, -400. -4000 ,/{1;;::;r:;::.

and -400F Series Airplanes

'''''''' ,,;", ,"

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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lap joi Ilts and certain posi-repair inspections of the bp joi 1115.Accomp Iishl11g the

length of lnp joint 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 by the 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 lap joints for widespread fatigue damage. We are issuing this AD to prevent fatigu O<J"",~y"OOl

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14910-13-PI

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration :ONC"~.["Ct.S

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D. IN ,'1,"'11

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10 I D

. . •. ,.•nu.l"""G applies 10 certam Model 747-200C, -200F, -400. -400D, and --400F senes mrplanes. Th

AD curremly requires repetitive inspections for cracks in the overlapping (upper) skin 0 ll'

ACTION: Fina! rule.

SUMMARY: The FAA is superseding an existing airworthiness directive (AD), which °""''11

5

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

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

14 erR Part 39

the upper fastener row of the lap joints of the fuselage skin in sections 41, 42, and 46; a

related investigative and corrective actions, if necessary. This new AD requires

expanding the inspection area in the existing AD, and adding a modification of certain

lap joints and cCI1ain post-repair inspections orthe lap joints. Accomplishing the

modification \vould end the repetitive illspections required by the existing AD for the

length oflap joint thaI is modified. This AD results from a structural review of affecte

skin lap joints for widespread fatigue damage. We arc issuing this AD to prevent fatigu

cracking in certain lap joints, which could result in rapid depressurization of the airplan

OATES: This AD becomes effective [tNSERT DATE 35 DA YS AFTER DATE OF

PUBLlCATION IN THE FEDERAL REGISTER].

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