(4910-13-U]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39 D~?, ,

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[Docket No. FAA~-I IIII; 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 of Transportation

(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 of the lap joints of the fuselage skin in

sections 41, 42, and 46; and related investigative and corrective actions, if necessary.

This proposed AD would expand the inspection area in the existing AD, and add a

modification of certain lap joints and certain post-repair inspections of the lap joints.

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Accomplishing the modification would end the repetitive inspections required by the

existing AD for the length of lap joint that is modified. This proposed AD results from a ~..\TE

structural review of affected skin lap joints for widespread fatigue damage. We are

proposing this AD to detect and correct fatigue cracking in certain lap joints, which caul

result in rapid depressurization of the airplane.

DATES: We must receive comments on this proposed AD by [insel1 date 45 days after

date of publication in the FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:

• Federal eRuJemaking Portal: Go to http://www.regulations.gov. Follow the

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overlapping (upper) skin, upper fastener row of the lap joints of the fuselage skin in

airplanes. The existing AD currently requires repetitive inspections for cracks in the

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

[Docket No. FA...<\-2009-1I I I !;Directorate Identifier 2009-NM-032-AD]

RIN 2120-AA64

ACTION: Notice of proposed rulemaking (NPRM). (. r::;,,~

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SUMMARY: The FAA proposes to supersede an existing airworthiness direbtive (AD) °1

that applies to certain Boeing Model 747-200C, -200F, --400, -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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modification of certain lap joints and certain post-repair inspections ofthc lap joints.

Accomplishing the modification would end the repetitive inspections required by the

existing AD for the length of lap joint that is modified. This proposed AD results from

structural review of affected skin lap joints for widespread fatigue damage. We are

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proposing this AD to detect and correct fatigue cracking in certain lap joints, wruch caul 7)1- t.f /0'

sections 4 J, 42, and 46; and related investigative and corrective actions, if necessary.

This proposed AD would expand the inspection area in the existing AD, and add a

result in rapid depressurization of the airplane.

DATES: We must receive comments on this proposed AD by [insert date 45 days after

date of publication in the FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:

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• Federal eRulernaking Portal: Go to http://www.regulations.gov. Follow the

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[4910-13-U]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 eFR Part 39

. RIN 2120-AA64

Series Airplanes

[Docket No, FAA-2009-' , , , '; Directorate Identifier 2009-NM-032-AD)

Airworthiness Direetives; Boeing Model 747-200C, -200F, -400, -400D, and -400F

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

airplanes. The existing AD currently requires repetitive inspections for cracks in the

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ACTION: Notice of proposed rulemaking (NPRM). f.~ "

SUMMARY: The FAA proposes to supersede an existing airworthiness dir1J;r,;!tlD) 11-

that applies to certain Boeing Model 747-200C, -200F, -400, -400D, and -400F series

overlapping (upper) skin, upper fastener fOW of the lap jQints of the fuselage skin in

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sections 41, 42, and 46; and related investigative and corrective actions, if necessary.

This proposed AD would expand the inspection area in the existing AD, and add a

modification of certain lap joints apd certain post-repair inspections of the lap joints.

Accomplishing the modification would end the repetitive inspections required by the

existing AD for the lengUI of lap joint that is modified, This proposed AD results from

structural review of affected skin lap joints for widespread fatigue damage. We are

proposing this AD to detect and correct fatigue cracking in certain lap joints, which co

result in rapid depressurization of the airplane.

DATES: We must receive comments on this proposed AD by [insert date 45 days after

,

date of publication in the FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the