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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration • NCVRR~"US

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14 CFR Part 39 #I()\- /1-+

[DOC:~:5tAA-2008-0981; Directorate Identifier 2008-NM~073-ADjAmcndmen

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RlN 2120-AA64

Ainvorthiness Directivesj The Boeing Company Model 747 Airplanes

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

(DOT).

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inner chord and reinstalling the terminating modification. For airplanes that are convert

new repetitive inspeclions, an interim modification, and post-interim modification

. . F .. I I· AD . I· . I . d ft 7z& ,0 inspectIOns. or certam alfp anes, t l1S requues rep acmg any prevIOus y repmre a OVTINGSYI16<X

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this new AD also requires certain inspections of the upper aft outer chords and diagonal

to the Model 747-400 large cargo freighter CLeF) configuration, this new AD reduces t

threshold and repeat intervals of certain post-modification inspections. For all airplanes,

those actions using revised selV'ice infonnation. For certain airplanes, this AD requires

post-modification inspection of the modified area. This new AD continues to require

currently requires a terminating modification for the repetitive inspections and a

brace attachment fittings, flanges, and rods to continue after the terminating modificatioJ .

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111i5AD results from reports of cracked aft inner chords on airplanes after certain

requirements of the existing AD were done. We are issuing this AD to prevent fatigu

cracking of the BS 2598 bulkhead structure, which could result in inability of the

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DEPARTMENT OF TRANSPORT ATION

Federal Aviation Administration

14910-13-PJ

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14 CFR Part 39 ;-<.'IU tit - I:J

lDocket No. FAA-2008-0981; Directorate Identifier 2008-NM-073-AD; Amendmen

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39-**; AD **1

RlN 2120-AA64

Ainvorthiness Directives; The Boeing Company Model 747 Airplanes

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

(DOT).

ACTION: Final rule. N[1~SlG

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currently requires a terminating modification for the repetitive inspections and a

post~modification inspection of the modified area. This new AD continues to require

those actions using revised service information. For certain airplanes, this AD requires

this new AD also requires certain inspections of the upper aft outer chords and diagonal

brace attachment fittings, flanges, and rods to continue after the terminating modificatio

This AD results from reports of cracked 'aft inner chords on airplanes after certain

new repetitive inspections, an interim modification, and post-interim modification rT •

inspections. For certain airplanes, this AD requires replacing any previously repaired aft OUTlHG74"

inner chord and reinstalling the terminating modification. For airplanes that are convert -I J

to the Model 747-400 large cargo freighter (LeF) configuration, this new AD reduces t "7ltffW~

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threshold and repeat intervals of certain post-modification inspections. For all airplanes, Ib / It i0

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requirements of the existing AD were done. We are issuing this AD to prevent fatigue

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cracking of the BS 2598 bulkhead structure, which could result in inability of the I

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