[491O-13-Pj

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 of Transportation

(DOT).

ACTION: Final rule.

SUMJ.\1ARY: The FAA is superseding an existing ainvortruness directive (AD) that

applies to all Boeing Model 737-100, -200, -20Ge, -300, -400, and -500 series airplanes

That AD currently requires a one-time inspection for scribe lines and cracks in the

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fuselage skin at certain lap joints, butt joints, external repair doublers, and other areas;

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and related investigative/corrective actions ifnecessary. This new AD expands the area 0

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be inspected and, for certain airplanes, requires earlier inspections faTceltain inspection R<llJTrNCSYMBOI.

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zones. This AD results from additional detailed analysis of fuselage skin cracks adjacen

to the skin lap joints on airplanes that had scribe lines. The analysis resulted in different DAn:

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inspection zones, thresholds and repetitive intervals, and airplane groupings. We are

issuing this AD to prevent rapid decompression o[the airplane due to fatigue cracks

resulting from scribe lines on pressurized fuselage structure.

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DATES: This AD becomes effective [insert date 35 days after date of publication in th UTENG'Y."'BQl

FEDERAL REGISTER]. 'N,T",uVS,G
[4910-13-PJ

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

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RlN 2120-AA64

Ainvorthincss Directives; Boeing Model 737-100, -200, -20De, -300, ADO, and -500

Series Airplanes

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

(DOD·

ACTION: Final rule.

SUMMARY: The FAA is superseding an existing airworthiness directive (AD) that

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applies to all Boeing Model 737-100, -200, -20De, -300, -400, and -500 series airplanes. NmAlSIS1G

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fuselage skin at certain lap joints, butt joints, external repair doublers, and other areas;

and related investigative/corrective actions if necessary. This new AD expands the area t

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be inspected and, for certain airplanes, requires earlier inspections for certain inspection

zones. This AD results from additional detailed analysis of fuselage skin cracks adjacent

to the skin lap joints on airplanes that had scribe lines; the analysis resulted in different

inspection zones, thresholds and repetitive intervals, and airplane groupings. We are

issuing this AD to prevent rapid decompression of the airplane due to fatigue cracks

resulting from scribe lines on pressurized fuselage structure.

DATES: This AD becomes effective [insert date 35 days after date of publication in th

FEDERAL REGISTER]. \..L .a. r:

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applies to all Boeing Model 737-100, -200, -lODe, -300, -400, and -500 series airplanes. ISIG

SUMMARY: The FAA is superseding an existing airworthiness directive (AD) that

That AD currently requires a one-time inspection for scribe lines and cracks in th.c

fuselage skin at certain lap joints, butt joints, external repair. doublers, and other areas;

and related investigative/corrective actions ifnccessary. This new AD expands the area t

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be inspected and, for certain airplanes, requires earlier inspections for certain inspection ATE

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

Series Airplanes

Ainvorthiness Directives; Boeing Model 737MIOO, -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 of fuselage skin cracks adjacent

to the skin lap joints on airplanes that had scribe lines; the analysis resuited in different

inspection zones, thresholds and repetitive intervals, and airplane groupings. We are

issuing this AD to prevent rapid decompression of the airplane due to fatigue cracks

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resulting from scribe lines on pressurized fuselage structure. .Z"t_-'\'\. -''2.cs.

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