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Federal Aviation Administration

DEPARTMENT OF TRANSPORTATION

AGENCY: Federal Aviation Administration (FAA), DOT.

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Airworthiness Directives; McDonnell Douglas Corporation Model MD-90-30 Airplan s J./JIi (f'k)?'-.

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14CFRPart39 '7-f)IO-Ol/33

[Docket No. FAA-~-I I I I ,; Directorate Identifier 2009-NM-1l7-AD)

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ACTION: Notice of proposed rulemaking (NPRl\1.).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain

McDonnell Douglas Model MD-90-30 airplanes. This proposed AD would require

inspecting for corrosion and other damage of the main landing gear retract cylinder

support fitting and the mating bore for the support fitting in the main landing gear (ML

trunion fitting and performing corrective actions, and replacing certain cadmium-plated

parts, if necessary. This proposed AD results from reports of failure of the 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.

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DATES: We must receive comments on this proposed AD by [insert date 45 days after '"

date of publication in tbe FEDERAL REGISTER].

ADDRESSES: You may send comments by any of the following methods:

• Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the

instructions for submitting comments .

• Fax: 202-493-2251.
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DEPA&TMENT"OF TMNSPO&'l"ATION

Federal Aviation AdminiStraffhJ'~I", '""

- McDonnell Douglas Model MP-90-30 airplanes. mlls proposed AD would require

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~peeting for corrosion and oilier~Oamagc of the main landing gear retract c~'linder

support fittiilg and the mating~bo[e for die sup¢;; fitting in the main "lan9iri; gear (MLG)

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14 CF& Part 39 "". "oJ:. _ "~ . "'

_[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).

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SUl\1MARY: We propose _toadoptif new-airworthiness directive~AD)for certain

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parts, if necessary. This proposed An)"esillts from reports of failure of the MLG retl1lct

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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

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adversely affect the ~irpl~~.'s~~fe.J~~j~g~-'" 1 __

I?AT):~:-~e~must recei~~'ct';\1ime~J:~~~~~ prosedADby [inse~,~f~,'1,:; ~aysafter .' ,-1 'c" '",iR',

dat.~Ofp~~~li~tion_~.~e~!~~f~t~Gl.~:~Rl::~~: ,~ .;~",.;:,'.

ADDRESSES; You may send cOIl1Jllents by any oftllc,f,ollowmg methods:" .

..:-'~i'-!:~~'~ 'F'~de~al ~RUlcn:akih~1~.: QQ:~,;~~tP:~~.re~~;la1io~~;'g~v .-';~o'ff-6wt~e

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{ instruclion~for,?"Jj~lti9g C9mm,e~j",,d"

• Fax:202"493'225LJ ' ,

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