14910-13-P)

Federal Aviation Administration DEPARTMENT OF TRANSPORTATION

AGENCY: Federal Aviation Administration (FAA), DOT. ~ 

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# IY'ii'O Airworthiness Directives; McDonnell Douglas Corporation Model MD-90-30 Airplan s

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# 4 1'-//0 14CFRPart39 

## '7-f)IO-Ol/33 [Docket No. FAA-~-I III,; Directorate Identifier 2009-NM-1l7-AD)

LIT GSYMOOL ACTION: Notice ofproposed rulemaking (NPRl\1.). SUMMARY: We propose to adopt anew airworthiness directive (AD) forcertain McDonnell Douglas Model MD-90-30 airplanes. This proposed AD would require inspecting for corrosion and other damage ofthe main landing gear retract cylinder support fitting and the mating bore forthe support fitting inthe main landing gear (ML trunion fitting and performing corrective actions, andreplacing certain cadmium-plated parts, 

### ifnecessary. This proposed AD results from reports of failure ofthe MLG retract cylinder support fitting during gear extension, and subsequently damaging the hydrauli system. We are proposing this AD to prevent corrosion and damage that could compromise the integrity ofthe,MLG retract cylinder support fitting, which could adversely affect the airplane's safe landing. NITIA1.S'SlG



## '" DATES: We must receive comments on this proposed AD by [insert date 45 days after date ofpublication intbe FEDERAL REGISTER]. ADDRESSES: You may send comments by any ofthe following methods: • Federal eRulemaking Portal: Go tohttp://www.regulations.gov. Follow the instructions for submitting comments . • Fax: 202-493-2251.-I ~ DEPA&TMENT"OF TMNSPO&'l"ATION



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# - McDonnell Douglas Model MP-90-30 airplanes. 

## mlls proposed AD would require



# - 5c-_k~ ~peeting for corrosion and oilier~Oamagc ofthe main landing gear retract c~'linder support fittiilg and the mating~bo[e 

## fordie sup¢;; fitting in the main "lan9iri; gear (MLG) ~ - -

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### ! 14 CF& Part 39 "". 

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_[Docket No. FAA-Z009-1: I}.} j ~jr,fC!.o~teldep.tifier2009-NY'::117-AD] !UN 2120-AA64 ""', . ,I . • Ai~orth~ness Directives'; McDonneJ1 PougIas-GorPoration Model MD-96-30 Airplanes"-- 

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### . . AGENCY: Federal Aviation Administr..tion (FAA),DOT. " 

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# . ACTION: Notice of prowsed.J].l.!err$kll:ig (NPR1JI). o"f SUl\1MARY: We propose _toadoptif new-airworthiness directive~AD)for certain

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'-7W--Z" '",'- parts, ifnecessary. This proposed An)"esillts from reports of failure 

## ofthe MLG retl1lct -,~--- truman filting and perf0rm!ngcorrective actions, and replacing certain cadmiwn-plated

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_ cylinder support fitting during gear extension., and subsequently damaging the hydraulic

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### ~,,-.. - system. We are prop~?ing 

### this_A,p tOJ~ev.ent corrosion and danp~e that could :y"compromisethe u,.fe~ty.Qf1:h:;_~(r~tr~ct cyUpder~supp?rt fittirg~.Which~couJd ,"";':T;',:; ~ f' adversely affect the ~irpl~~.'s~~fe.J~~j~g~- '" 1
__ I?AT):~:-~e~must

recei~~'ct';\1ime~J:~~~~~ prosed

AD 

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,~ .;~" ,.;:,'. ADDRESSES; You may send cOIl1Jllents byany oftllc,f,ollowmg methods:" . 

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# r. ~tF'C"lFlLE"OPY <c FAA Form 1360--14,1 (6-89)