[4910-13-P]

DEPARTMENT OF TRANSPORTATION

I

Federal Aviation Administration

CONCUJ<RENCEO

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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 of prlposed 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 Ifr mes and stub beams, and

correclive actions if nec1ssary. For certain airplanes, tlis roposed AD would also

require repetitive inspec\ions for cracking of the inb01d ,hord fastener hole of the fram e"m. , ,."

at body station 639, strilger S-16, and corrective actions if necessary. For certain INITI".5!1;l<'

airplanes, this proposed r would also require an inspbelion to determine the edge

margin of the 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 if necess . This proposed AD

eventually requires a preventive modification. Doing tJe }odification or a repair would ~ATo

. h .. I . F . I II' h th d'fi' . . m,,,,,,,ooc tenmnate t e repetltlve lllspectlOTIs. or atrp anes on w u ' e mo 1 1catIon or repaIr 1S

done at certain body stalions, trus proposed AD would re uire repetitive inspections for """'s'"

cracking of certain 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 l1ight cycle ""'''.''>''

stresses from both pressurization and maneuver load. Je are proposing this AD to detec D.HE

and correct fatigue crac I ing of certain fuselage frames L stub beams and possible

14 CFR Part 39
[4910-13-P)

DEPARTMENT OF TRANSPORT AnON

[Docket No. FAA-2010-1 I I I Ij Directorate Identifier 2009-NM-192-AD)

RlN 2120-AA64

Federal Aviation Administration

14 eFR Part 39

I

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

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AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice OfprJposed rulemaking (NPRM).

Airplanes

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SUMMARY: We propose t? adopt a new airworthiness directive (AD) for certain Mode '''nG4(

737-100 and -200 series airplanes. This proposed AD \-volld require repetitive inspection ATf I J•.•.(,f , .0

for cracking and damaged fasteners of certain fuselage frames and stub beams, and ""'"'95_ I AIJI"I- ,u>S

corrective actions if necessary. For certain airplanes, this proposed AD would also r

require repetitive inspections for cracking of the inboard dhord fastener hole of the 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 of the lower chorld and, for airplanes with a cefi

t

short edge margin, repetitive

inspections for craCking) and corrective actions if necessa y. This proposed AD I I OUnNG S'fM OL

eventually requires a preventive modification. Doing tlie modification or a repair would -Aw

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terminate the repetitive inspections. For airplanes on whi h the modification or repair is ~

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done at certain body stations, this proposed AD would require repetitive inspections for

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necessary. This proposed AD results from reports of the etection of fatigue cracks at

certain frame sections, in addition to stuh beam craCkin1gfcaused by high flight cycle

stresses from both pressurization and maneuver load. e e proposing this AD to

prevent fatigue cracking of certain fuselage frames and S b beams and pOSSIblesevered

OOJnHG SfHllOlcracking of certain frame webs, and inner and outer chor and corrective actions if ~ "A1JN\1c:v?

'"
[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

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ACTION: Notice of proposed rulemaking (NPRM).

M -ILoJ

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Mode NA~G_

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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 if necessary. For certaio airplanes, this ~roposed AD would also

require repetitive inspections for cracking of the inboard chord fastener hole of the fram

I

at body 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 of the lower chonu and, for airplanes with a certJin short edge margin, repetitive

inspections for cracking, lnd corrective actions if necesJary. This proposed AD

all eventu y reqUires . a preventIve I. mod'fi' I 1catlOn. D'omg theI moI d'fiI lcatlOn . or a repaIr. wou.Id

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 of certain frame wehs, and inner and outer Chord' and corrective actions if

necessary. This proposed AD results from reports of the detection of fatigue cracks at

certain frame sections, in addition to stuB beam 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 of certain fuselage frames and stu beams and possible severed

."