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DEPARTMENT OF TRANSPORTATION Federal Aviation Administration

RIN 2120-AA64 Airworthiness Directives; Boeing Model 737-100, -200, -ZODe, -300, -400, and -500 Series Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). ACTION: Final rule. SUMJ.\1ARY: The FAA is superseding an existing ainvortruness directive (AD) that applies toallBoeing Model 737-100, -200, -20Ge, -300, -400, and -500 series airplanes That ADcurrently requires aone-time inspection forscribe lines andcracks inthe
INmA'S"G fuselage skin atcertain lapjoints, buttjoints, external repair doublers, and other areas; 

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# '=co=,------ be inspected and, forcertain airplanes, requires earlier inspections faTceltain inspection R<llJTrNCSYMBOI. 

### ""m""'''''_''"''',---- zones. This AD results from additional detailed analysis offuselage skin cracks adjacen to the skin lapjoints on airplanes thathad scribe lines. The analysis resulted indifferent DAn: 

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inspection zones, thresholds and repetitive intervals, and airplane groupings. We are issuing this AD toprevent rapid decompression o[the airplane due to fatigue cracks resulting from scribe lines onpressurized fuselage structure. 

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DATES: This ADbecomes effective [insert date 35 days after date ofpublication inth UTENG'Y."'BQl FEDERAL REGISTER]. 'N,T",uVS,G[4910-13-PJ

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39 OtlOJRReNCES OUTING SYMBOl

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## .' v" be inspected and, for certain airplanes, requires earlier inspections for certain inspection ATE AGENCY: Federal Aviation Administration (FAA), Department ofTransportation Series Airplanes Ainvorthiness Directives; Boeing Model 737 MIOO, -200, -20De, -300, -400, and ~500

ACTION: Final rule. RlN 2120-AA64 39-**; AD **J fDocket No. FAA-2009-0452j Directorate Identifier 2007-NM-326-ADj Amendment 14 CFR Part 39

(DOT). Federal Aviation Administration

zones. This AD results from additional detailed analysis offuselage skin cracks adjacent tothe skin lapjoints on airplanes that had scribe lines; the analysis resuited indifferent inspection zones, thresholds and repetitive intervals, and airplane groupings. We are issuing this AD to prevent rapid decompression ofthe airplane due to fatigue cracks 

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