[4910-13-P]

DEPARTMENT OF TRANSPORTATION I Federal Aviation Administration CONCUJ<RENCEO ROUTlNG snlBOI. 

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'HTE RIN 2120-AA64 Airworthiness Directiv.es; The Boeing Company Model 737-100 and -200 Series



# 04~1 [Docket No. FAA-2010-+++++; Directorate Identifier 009-NM-192-AD]

Airplanes AGENCY: Federal Aviation Administration (FAA), DO ACTION: Notice ofprlposed rulemaking (NPRM). SUMMARY: We proplse to adopt a new airworthinej' irective (AD) for certain Mod 737-100 and -200 series airplanes. This proposed AD

# woLd require repetitive inspectio for cracking and damaged fasteners of certain fuselage Ifrmes and stub beams, and correclive actions ifnec1ssary. For certain airplanes, tlis roposed AD would also require repetitive inspec\ions for cracking ofthe inb01d ,hord fastener hole ofthe fram e"m. , ,." at body station 639, strilger S-16, and corrective actions

# ifnecessary. For certain INITI".5!1;l<' airplanes, this proposed

# rwould also require an inspbelion to determine the edge margin ofthe lower chord and, for airplanes with a

# ceJaitl short edge margin, repetitive "OUTINGSI"M,JOL



# I I INITI,u$lSIG inspections for craCkingl and corrective actions ifnecess .This proposed AD eventually requires apreventive modification. Doing tJe }odification or arepair would ~ATo

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### m,,,,,,,ooc tenmnate t erepetltlve lllspectlOTIs. or atrp anes on wu ' emo 1 1catIonorrepaIr 1S done at certain body stalions, trus proposed AD would re uire repetitive inspections for """'s'" cracking ofcertain frame webs, and inner and outer Cht s and corrective actions if ~A'IE necessary. This propose~ AD results from reports ofthb etection of fatigue cracks at .OUTlNG'''MROL certain frame sections, it addition to stub beam erackiJg, caused by rugh l1ightcycle 

### ""'''.''>'' stresses from both pressurization and maneuver load. Je are proposing this AD to detec D.HE and correct fatigue crac Iing ofcertain fuselage frames

# L stub beams and possible 14CFR Part 39[4910-13-P)

DEPARTMENT OF TRANSPORT AnON

[Docket No. FAA-2010-1 III Ij Directorate Identifier 2009-NM-192-AD) RlN 2120-AA64 Federal Aviation Administration 14eFR Part 39 

# I Ainvorthiness Directives; The Boeing Company Model 37-100 and -200 Series 

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DATE

## \/1'1. ;0 INITIA~jSIG AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice OfprJposed rulemaking (NPRM). Airplanes



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-/20! SUMMARY: We propose 

# t? adopt anew airworthiness directive (AD) for certain Mode

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### 4( 737-100 and -200 series airplanes. This proposed AD \-volld require repetitive inspection ATf 

# I J•.•. (,f , .0 for cracking and damaged fasteners ofcertain fuselage frames and stub beams, and ""'"'95_ 

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## ,u>S corrective actions ifnecessary. For certain airplanes, this proposed AD would also 

# r require repetitive inspections forcracking ofthe inboard dhord fastener hole ofthe fram a1body station 639, stringer S-16, and corrective actions ~neeessary. For certain airplanes. this proposed

# In would also require an insplcfon to determine the edge margin ofthe lower chorld and, for airplanes with acefi

# t short edge margin, repetitive inspections for craCking) and corrective actions ifnecessa y. This proposed AD I I OUnNG S'fM OL eventually requires apreventive modification. Doing tlie modification or a repair would 

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### .;..6'V terminate the repetitive inspections. For airplanes on whi h the modification orrepair is ~0 

# I "'TE \1 done at certain body stations, this proposed AD would require repetitive inspections for

NIllALSlS1G necessary. This proposed AD results from reports ofthe etection of fatigue cracks at certain frame sections, in addition to stuh beam craCkin1gfcausedby high flight cycle stresses from both pressurization and maneuver load. e e proposing this AD to prevent fatigue cracking ofcertain fuselage frames and S b beams and pOSSIblesevered OOJnHG SfHllOlcracking ofcertain frame webs, and inner and outer chor and corrective actions if ~ 

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## '"[4910-I3-PI

DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 IDocket No. FAA-2010-1 I I I I; Directorate Identifier 2009-NM-192-ADI RIN 2120-AA64 Airworthiness Directives; The Boeing Company Model' 37-100 and -200 Series OUnNG SYMBOL 

## ADm-I Airplanes AGENCY; Federal Aviation Administration (FAA), DO 1.J.l;=-CI<-&il 

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HrTIAlSIS1G ACTION: Notice ofproposed rulemaking (NPRM). 

## M -ILoJ SUMMARY: We propose to adopt anew airworthiness directive (AD) for certain Mode 

# NA~G

_ . . l/.~ 737-100 and -200 series airplanes. This proposed AD \VOid require repetitive inspectio TE for cracking and damaged fasteners of certain fuselage fraines and stub beams, and corrective actions ifnecessary. For certaio airplanes, this ~roposed AD would also require repetitive inspections for cracking ofthe inboard chord fastener hole ofthe fram 

# I atbody station 639, stringer S-16, and corrective actions i~necessary. For certain airplanes, this proposed tD would also require an inspectibn to determine the edge margin ofthe lower chonu and, for airplanes with acertJin short edge margin, repetitive inspections for cracking, lnd corrective actions ifnecesJary. This proposed AD
all . 

# I. d'fi' D' th

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. . Id eventu y reqUires apreventIve mo I 1catlOn. omg emo I lcatlOn or a repaIr wou. terminate the repetitive inspections. For airplanes on whicJ the modification or repair is done at certain body stations, this proposed AD would reqtre repetitive inspections for crackiog ofcertain frame wehs, and inner and outer Chord' and corrective actions if necessary. This proposed AD results from reports ofthe detection of fatigue cracks at certain frame sections, in addition to stuBbeam cracking, clused by high flight cycle stresses from both pressUFization and maneuver load.

# We Je proposing this AD to Nll1.o\I.SIS1G prevent fatigue cracking ofcertain fuselage frames and stu beams and possible severed 

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