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DEi'ARTMENT OF TRANSPORTATION iC'ONC-u",{RENCES

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Federal Aviation Administration

14CFR i'arl39 , , '. Ci

)010-01(, 1

(Docket No. FAA_~'k****; Directorate Identifier 2009-NM-l 02-':"'-D)

RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc. Model CL-600- J A 11 (CL-600),

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CL-600-2A 12 (CL-60 I), CL-600-2B 16 (CL-601-3A, CL-601-3R, and CL-604 variantsr~'7""""i l

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IN'T'ALSISlG Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTiON: Notice of proposed rulemaking (NPR1vl).

listed above that would supersede an existing AD. This proposed AD results from

mandatory continuing airworthiness information (MeAl) orIginated by an aViation

authority of another country to identify and correct an unsafe condition on an aviation

product The MeAl describes the unsafe condition as:

A specific batch of nose landing gear (NLG) and NLG door

selector valves, part number (PIN) 60 IR 75146-1 (Kaiser Fluid

Technologies PIN 750006000), may have had their end caps

incorrectly lock-wired and/or incorrectly torqued during assembly.

This condition can lead to the end cap backing off, with

consequent damage to a seal and intemallcakage \vithin the valve.

Subsequently, if electrical power is transferred or removed from

the aircraft before the NLG safety pin is installed, any pressure,

including residual pressure, in the No.3 hydraulic system can

result in an uncommanded NLG retraction.

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Federal Aviutioll Administnttion

14 CFR Part 39

[Docket No. (i~AA-2009-';'-;"i<**;Dil-ectol-atc Identifier 2009-NM-102-AD]

IUN 2120-AA64

Ainvortbiness Directives; Bombardier Model CL-60Q-IAll (CL-600), CL-600-2A12

(CL-60 I), and CL-600-2B 16 (CL-60 1-lA, CL-601-lR, and CL-604) Ai'Plal1es

AGl!:NCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice ofpropm;ed rulcmaking (NPluVl).

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

listed above that would supersede an existing AD. This proposed AD results from

mandatory continuing airworthiness information (MeAl) originated by an aviation

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product. The MeAl describes the unsafe condition as:

authority of another country 10 identify and corrcct an unsafe condition on an aviation

A specific batch ofnast.": landing gear (NLG) and NLG door

selector vulves, part number (PiN) 60] R75146-1 (Kaiser Fluid

Technologies PIN 750006000), may have had lheir end caps

incorrectly lock-wired andlor incorrectly torqued during assembly.

This condition can lead to the end cap backing on: with

consequent damage to a stal alld internal leakage within the valve.

Subsequently, if c!cl',lrical pO\NCr is Iransrerred or removed from

the aircraJ'L before the NI.G safety pin IS installed, any pressure,

including residual pressure, in lhe No.3 hydraulic system can

result in an ullcommanded NLG retraction.

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The proposed AD would reqUIre actions that arc intended to address the unsafe condition

described in the MeAl.
I)EPAI.f:TMENT OF THANSPORTi\TION

Federal AVI.3tioli Administration

14 CF1~Pnrt 39

[Docket No. FAA-Z009-*****; llir'cctomtc Idcniificr Z009-NM-l 02-An.l ""kflOu(. '"Y,u'

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lUN 2120-AA64

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AinvOl'lhil1CSs DiI'Cl'livcs; Bombardier Model CL-600-1 A 11 (Cr .-600), CL·600~2A 12

(eL-GOl), and CLAlOO·2B 16 ((:L-601-3I\, CL.-60l-3R, and CL-604) Airplanes

,\GENCY: l;edenll i\viatlon Administration (FAA), DOT,

ACTION: Notil:c of'proposccl ruJcm,ddng (NPRM).

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l"he pmp()m~d I\D would require aClions (hailln: llllcnded to addre:;s the t11lsafc condition

<lulhorit)' ofanolhcr counlry to identify and eorrCCI an unsafe condition 011an aviation

mandatory continuing airwurthincss information (MeAl) originated by an :wi<llion

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A spccific bUith \lfnose Illuding gem (Nl..G) and NLG door

sciec!or vOlIVtS, pUl1 number (I'/N) GOIR75146-1 (Kaiser Fluid

T<..::clml.llllgiesPIN 75000(000), lllUYhave had theil" end ClIpS

incorrectly lock-wired ,md/or incorrectly torqued dming a~selllbly.

This (;onl!itioll CUllleud lo thc cild cap backing of"C witlt

consequcilt damage to a ,:ieal nnd internal lcak<lge within thl;":valve.

Subsequently, if cktlrical power is trtmSfelTcd or removed from

the aircrall hc!orc lhe Nl,Ci sar~typin is installed. nny pressul"C,

including l'csiuual prl'-,.-;SlIl"e, in Ihe No. J hydmulic system c,m

resull ill an Ulleolllmandcd NLG retraction.

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Ji$lcd above thal wOlild !lupersede an exhlting 1\0. This proposed AD results Cram

describl.:d in Ill>:MeAl.

producl. Thc ivlCAI describe:; the ullsure condition as:

SUMMARY: We propose lo adopt n new nlrworthinc.'>S directive (AD) 1'01'the products