### [4910-13-P]

DEPARTMENT OF TRANSPORT AnON O~CI,"P_MCtoS ~('l]TI~(i~YMlU)1 

### Federal Aviation Administration 14CFR Part 39 

# 1J,I:? [Docket No. FAA-2009-+++++j Directorate Identifier 2009-NM-097-AD] eoUTI~""'M"OL 

### RlN 2120-AA64 Ainvorthiness Directives; McDonnell Douglas ModeJ DC-9-81 (MD-81). DC-9-82 iJ.'I'F 

### (MD-82), DC-9-83 (MD-83), and DC-9-87 (MD-87), and MD-88 Airplanes 

# 11/13/, '" "OlJT'~'r'"'~1ElQl. 

### AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRlv1). survfMARY: We propose to adopt a new airw0l1hiness directive (AD) for certain 

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# 1-7-/0 McDonnell Douglas Model DC-9-8] (MD-81), DC-9-82 (MD-82), DC-9-83 (MD-83). and DC-9-87 (MD-87), and MD-88 airplanes. This proposed AD would requirerepctitiv inspections for cracking of the lower rear spar caps ofthe wings, and related investigativ 

# 7

• Fax: 202-493-2251. • Federal eRulemaking Portal: Go to Imp:!/www.rct!ulations.Q.ov. Follow the ADDRESSES: You may send comments by any of the following methods: DATES: We must receive comments on this proposed AD by [insert dale 45 days after Lhewing. skin or other structure, and consequent reduced structural integrity of the wing. this AD to detect and correct fatigue cracking, which could result in fuel leaks, damage t

date ofpublication in the FEDERAL REGISTER}, and corrective actions ifnecessary. This AD would also require repetitive inspections of certain repaired areas. This proposed AD results from reports of cracking of the wing real INII II-

# h\ \W~~\ spar lower cap atthe outbo.ard flap and inboard drive hinge at station Xrs=164.000; the 

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# I!c. crack1l1gis due to material fatigue from normal flap operating loads. We are proposing

instructions for submitting comments .u_s. Depanmcnt

orTransponation Federal Aviation Administration Tr~llsp()rt Aiq)l~neOirertnr~te Los Angeles Aircraf1 Certification Omce 3960 P:Jr>lmnum Rou!t:,-;)rd L.1KCwood. Calilbmi" 90712 4!37



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## - [4910-13-P] Fedcr3l Avi;tliull Administl':lrion DEPART1\It-:yr OF TH.-\NSPORT-\TION

sp,lr lower l:'II' ,ll thl' Ulilbll<lrd JJap ane! mbomd driv0 hinglO [It stmion Xrs:164.UOO; the and DC·9-S7 (i\'lD-871. ~lnJ i\ID-88 airplanes. This proposed AD would ['equlro: repetitive McDonnell DOLlg.l,]sIVlodd ])(>9-8] (1"",10-81),OC-9-82 (MD-82), DC·9-83 (l\lD-X3), inspections 1\.,1"

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vrlhc Io\ver rear :::parcaps at' the \\·jngs, w1d n:.'l~ncdinvestigative (MD-82), 0(:-9-83 (1\ID-H3j_ and DC-9-87 (t\ID-87), nnd MD-8l> Airplan..::s ACENCY: I·\-dcral AViation Administration (FAA). DOT. Aim·orthinc:'ls Dirl'cthc.s; MeDonnell Douglas Modd OC-9-81 {MD·gl). DC-9-82 RIN 2120-AA6-1

ACTION: Notice ur proposed rulemaking ~NPRlvl). 14 CFR Part 39

lInd eorrccti\"c ;I(::tion<;if Ik'Ccss"ry. This AD would also reqllil·~ r..:::petitiw inspections of cenain rcpuir..:d ,1r(:,IS. Ihi~ proposed AD results from rq)orl's orcr:lckln~ ortlle wing rear SUMMARY: \\'~ propose to adop[ a new a!l\\-"orthiness directive (AD) for certain {Docket No, F.\A-20U9-+++++; Din'ctoratc Idcnt'ifi('1" 20U9·Ni\I-097-ADI

cracking b du\.' LOl1lakri:d b1igue from llorm:11nap opl'r:"lling loads. WI: arl' propusing 

### f~~,",---- this AD (0 dl.:h:ct :ll1d UltrCCt fittigue cracking. whIch could result in Cuelle'1ks. dam:ig.e lO the wing. skin or ~lllh.'rstructure, and cons'-''lucJl\ n,:ducl:d structural int\.'grily ol"the wing. DATES: We must r\.'c •.. i\o." comments OJ] this proposed AD by linsen dntc 45 days aller date ofpublit::niol'l ill till: H2IJERi\L REGISTER]. ADDRESSES: You m<l~s\':ndcomments by any of th~ !'ol!l.}\\ ing lllt'thuds:

•• Fed<..:r:11<..:Rllh:makmg Ponal: Go to lllltl:/!~\ \\\.r\.·i!lt!ati911li:.g',H. Follow [he Purpose - Al'ialion Safety Professionalism
- TechnicalExcellence Pride -Highest QualifY FAA Form 1260_14.1 (6-89) OFFICIALFILE COPY