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DEPARTMENT OF TRANSPORTATION P.,f'lJ"""~O-, '(ll1'r"'fj ~Y""(\L Federal Aviation Administration 14CFR Part 39 oC\



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. (Docket No. FAA-2009-r**; Directorate Identifier 2009-NM-I06-AD] RIN 2120-AA64 Airworthiness Directives; Bombardier Model CL-600-2B 19(Regional Jet Series 100 440) Aill)!anes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). 

# "'j ~~~,,~n,~,~,y~"""OO;;-C-- SUMMARY: We propose to adopt anew airwortl-ulless directive (AD) forthe product 

## {ft;fJfl.J-,.-[CfO listed above. This proposed AD results from mandatory continuing airworthiness 

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DoH"- infoll11ation(MeAl) originated byan aviation authority of another country to identify and con-eet an unsafe condition on an aviation product. The MeAl describes the ullsafe,.,rrt"'S"'U condition as: 

### ~"*~,,-,, ---- A specific batch ofnose landing gear (NLG) and NLG door selector valves, part number (PIN) 601R75146-l (Kaiser Fluid Technologies PIN 750006000), may have hadtheir end caps incorrectly lock-wired andlor incorrectly torqued during assembly. This condjtion can leadto the end cap backing off, with consequent damage to aseal and intemal leakage within the valve. Subsequently, i

## relectJical power IS transferred or removed from the aircraft before the NLG safety pin is installed, any pressure, including reSIdua]pressure, in the NO.3 hydraulic system can result inan uncommandcd NLG retraction and/or uncommanded opening ofthe NLG doors. There have been six cases reported on CL600-2B19 aircraft, one ofwhich resulted inthe collapse ofthe NLG atthe departure gate. ~,,",,;;;rl~"'G~"~''';;;'"''--



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DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA~2009-*****j Directorate Identifier 2009-NM-106-ADJ RlN 2120-AA64 Ainvorthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplane~ AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed ruJemaking (NPRM). I , I ,$,u I ill 

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UTIN 'oY ANE·I?I INfI'lAI,"'''1l

.Gomez.

OVTl~GSY""' ANE-171 SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MeAl) originated byan aviation authority of another country to identify and correct anunsafe condition onan 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) 601R75146-1 (Kaiser Fluid Technologies PIN 750006000), may have had their end caps incorrectly lock-wired and/or incorrectly torqued during assembly. This condition can leadtotheend capbacking off, with consequent damage to a seal and internal leakage within the valve. Subsequently, ifelectrical power is transferred or removed from theaircraft before theNLG safety pinisinstalled, anypressure, including residual pressure, in the NO.3 hydraulic system can result in an uncommanded NLG retraction and/or uncoffimanded opening of the NLG doors. There have been six C8sesreported on CL600-2B 19 aircraft, one of which resulted in the collapse ofthe NLG at the departure gate. ,"mAL!I,"';; 

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