[4910-I3-Pj

DEPARTMENT OF TRANSPORT AnON Federal AviatioD Administration ONCURRf'lCfS ROUTINe>SYM60t

DUE

OUnNG SYMBOL 

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DATE 

# 8-17-10

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~ PATE 

# e/;;;>3)/() (DOT). RIN 2120-AA64

corrosion ofthe skin pallellapjoints in the hlselage upper lobe, and repair ifnecessary.
and inspection ofmodified lapjoints. The other AD, AD 90-15-06, requires repetitive detailed external visual inspections ofthe fuselJge skin atthe upper lobe skin lapjoints 

## I for cracks and evidence ofcorrosion, and related investigative and corrective actions. This AD reduces the maximum interval ofthe pbst-modification inspections, and adds post-repair inspection requirements forcertain JirPlanes. TIlis AD results from reports 0 

# ATq;r; 0 

# I ~G~L cracking on modified airplanes. We are issuing this AD to detect and correct fatigue 

# VA.-- laC) 1 I I ]Al.S/SJG cracking and corrosion in the fuselage upper loo.eskin lapjoints, which could lead to 

# A.\5a~ rapid decompression ofthe airplane and inabilit~ ofthe structure to carry fail-safe loads. D-qE 

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# 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 ofTransportation
ACTION: Finalrule.

One ofthe existing ADs, AD 94-12-09, also requires modification ofcertain lapjoints 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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2010-*7::.1.; 

# 04

DATE(4910-13-PJ

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39 NCURREl'CES OUnNG SYMSOlJNmA~SISlG (Docket No. FAA-20IO-0552; Direetorate Identifier 2009-NM-095-AD; Amendmcn 

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_ 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-hieh apply 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 ifnecessary. One ofthe existing ADs, AD 94-12-09, also requires modification ofcertain lapjoints and inspection ofmodified lapjoints. The other AD, AD 90-15-06, requires repetitive detailed external visual inspections ofthe fuselage skin atthe upper lobe skin lapjoints for cracks and evidence of corrosion, and related investigative and corrective actions. This AD reduces the maximum interval ofthepost-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 lapjoints, which could lead to rapid decompression ofthe airplane and·'inability ofthe structure to carry fail-safe loads. DATES: This AD becomes effective [INSERT IDATE35 DAYS AFTER DATE OF PUBLICATION INTHE FEDERAL REGISTER]. 

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# 8-17-10

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