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### Federal Aviation Administration 14CFR i'arl39 , , '. Ci



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# 1 (Docket No. FAA_~'k****; Directorate Identifier 2009-NM-l 02-':"'-D) RIN 2120-AA64 Airworthiness Directives; Bombardier, Inc. Model CL-600- J

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### Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTiON: Notice ofproposed 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 ofanother country to identify and correct anunsafe condition on an aviation product The MeAl describes the unsafe condition as:

A specific batch ofnose landing gear (NLG) andNLG door selector valves, part number (PIN) 60IR75146-1 (Kaiser Fluid Technologies PIN 750006000), may have had their end caps incorrectly lock-wired and/or incorrectly torqued during assembly. This condition can leadto the end cap backing off, with consequent damage to a seal and intemallcakage \vithin the valve. Subsequently, ifelectrical power istransferred orremoved from the aircraft before the NLG safety pin isinstalled, any pressure, including residual pressure, in the No.3 hydraulic system can result in anuncommanded NLG retraction. ""UTI"""''''"OL 

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### D~:PARTM~:NTOFTRANSPORTAnON llNCU""">","' "CS"M AN-I73 Federal Aviutioll Administnttion 14CFR 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). <Otm><C ,"c."" l.GB~~ NtTIAL.~ •• ",

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# ~71b /01 "'''''$YM!OC ANE-171 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 byan aviation 

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### 'Y"H' ,'NE· 171 product. The MeAl describes the unsafe condition as: authority of another country 10identify 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\NCris Iransrerred or removed from the aircraJ'Lbefore 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 14CF1~Pnrt 39 [Docket No. FAA-Z009-*****; llir'cctomtc Idcniificr Z009-NM-l 

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~(10m,,; 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"hepmp()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 byan :wi<llion D. P"" ill" 

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# • • A spccific bUith \lfnose Illuding gem (Nl..G) and NLG door sciec!or vOlI

VtS,pUl1number (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 ,:iealnnd internal lcak<lge within thl;": valve. Subsequently, ifcktlrical 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.


## , 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