[4910-I3-Pj

DEPARTMENT OF TRANSPORT AnON

Federal AviatioD Administration ONCURRf'lCfS

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RIN 2120-AA64

corrosion of the skin pallellapjoints in the hlselage upper lobe, and repair if necessary.

and inspection of modified lap joints. The other AD, AD 90-15-06, requires repetitive

detailed external visual inspections of the fuselJge skin at the upper lobe skin lap joints

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for cracks and evidence of corrosion, and related investigative and corrective actions.

This AD reduces the maximum interval of the pbst-modification inspections, and adds

post-repair inspection requirements for certain JirPlanes. TIlis AD results from reports 0 ATq;r; 0

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cracking on modified airplanes. We are issuing this AD to detect and correct fatigue VA.-- laC)

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cracking and corrosion in the fuselage upper loo.e skin lap joints, which could lead to A.\5a~

rapid decompression of the airplane and inabilit~ of the structure to carry fail-safe loads. D-qE z..S 10

I OVTING SYMBOL

DATES: This AD becomes effective [INSERT[DATE 35 DAYS AFTER DATE OF NmAlS/SlG

PUBLICATION IN THE FEDERAL REGISTE;R].

existing ADs currently require inspections to detect fatigue-related skin cracks and

Airworthiness Directives; The Boeing Company Model 747-100, 747-200B, and

747-200F Series Airplanes

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

ACTION: Final rule.

One of the existing ADs, AD 94-12-09, also requires modification of certain lap joints

14 CFR Part 39

SUMMARY: The FAA is superseding two existing airworthiness directives (ADs),

which apply to certain Model 747-]00, 747-200B, and 747~200F series airplanes. The

fOo<;lietNo. FAA-20I0-0552j Directorate Identifier 2009-NM-095-AD; Amendmen

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DATE
(4910-13-PJ

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

NCURREl'CES

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(Docket No. FAA-20IO-0552; Direetorate Identifier 2009-NM-095-AD; Amendmcn A.lat~

_39-**; AD 2010-**-**)

RlN 2120-AA64

Ainvorfhiness Directives; The Boeing Company Model 747-100, 747-2008, and

747-200F Series Airplanes

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

(DOT).

ACTION: Final rule.

SUMMARY: The FAA is superseding two existing airworthiness directives (ADs),

\V-hiehapply to certain Model 747-100, 747-2008, and 747-200F series airplanes. The

existing ADs currently require inspections to detect fatigue-related skin cracks and

corrosion ofthe skin pane1lap joints in the fuselage upper lobe, and repair if necessary.

One of the existing ADs, AD 94-12-09, also requires modification of certain lap joints

and inspection of modified lap joints. The other AD, AD 90-15-06, requires repetitive

detailed external visual inspections of the fuselage skin at the upper lobe skin lap joints

for cracks and evidence of corrosion, and related investigative and corrective actions.

This AD reduces the maximum interval of the post-modification inspections, and adds

post-repair inspection requirements for certain airplanes. This AD results from reports 0

cracking on modified airplanes. We are issuing this AD to detect and correct fatigue

cracking and corrosion in the fuselage upper lobe skin lap joints, which could lead to

rapid decompression of the airplane and·'inability of the structure to carry fail-safe loads.

DATES: This AD becomes effective [INSERT IDATE 35 DAYS AFTER DATE OF

PUBLICATION IN THE FEDERAL REGISTER].

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