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### DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14CFR Part 39 , ~ -,/_



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### [Docket No. FAA-:Z:OOY"-*****; Directorate Identifier 2009-NM-144-AD] RlN 2120-AA64 Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series lOO 

### 440) Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: We propose toadopt anew airworthiness directive (AD) forthe product listed above that would supersede anexisting AD. This proposed AD results from mandatory continuing airworthiness infonnation (MCAf) originated 

### by an aviation authority of another country to identi fy and correct an unsafe condition on an aviation 

### product. The MeAl 

### describes the unsafe condition as: Three cases ofin-flight loss ofcabin pressurization have been reported, resulting from failure ofa bulkhead check valve incombination with failure ofan air supply duct. Tn addition to mandating inspection, rework andlor replacement ofl' he air supply ducts, Airworthiness Directive (AD) CF-2003-0S (subsequently revised toCF-2003-0SRl) [which corresponds to FAA AD 2004-22-08] mandated the incorporation ofa4 000 flight-hour repetitive inspection task forbulkhead check valves, Part Numbers (PIN) 92E20-3 and 92£20-4, into the approved maintenance schedule. However, this repetitive inspection task has since been superseded by a 3000 flight~hour periodic discard task forthese bulkhead check valves. This directive mandates revision oftlle approved maintenance schedule to incorporate the discard task forbulkhead check valves, PIN 

### 92E20-3 and 92E20-4, and supersedes the instructions inCorrective Actions, Part A, of 'ONCUTU<ENC", "OUTH<G SYMBOL

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listed above that would supersede anexisting AD. This proposed AD results frum mandatory continuing airworthiness informatiol1 (tvlCAI) or.iginated by an aviation DEPARTMENT OF'THANSI'ORTATION Federal Aviation Administration 14 CFR Part 39 rOod{ct No. FAA-2009-"*"'**; Dircctorate IdcntitiCI' 2009-NM-.I44-ADI IUN 2120-AA64 Airworthincss Directives; Bombardier Model CL-600-2B 19(Regional Jet Series 100& 440) Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). SUMMARY: ~e pwposetoadopt anew airworthiness directive (AD) for the products 

## f:ilt' allthority of another country to identily and correct an unsafe condition on an aviation product. The MeAl describes theUnsafe condition as: Three cascs ofin-jlight Jossof(;(lbinjlfcssurizatioll have been reported_ reS\J1tillg from f~'lilure

of a bulkhead check valVe in combination with failUreof an air supply duel. 

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Inaddition to mandating inspection, rework and/or replacement orthe air supply ducts, Airworthiness Directive (AD) CF~2003-05 (subsequently revised to CF-2003-05RI) !.whidl corresponds lo FAA AD 2004-22-08] mandated the im:orporution 

## ora4 000 fiight+hour repetitive inspection task for bulkhead check vnlves, Part Numbers (PIN) 92E20~3 and 92E20- 4, into the approved maintenance schedule. However, this rcpctiti.ve inspection task bas since been superseded bya 3000 "Hight-hourperiodic discard task for these bulkhead check valves. This directive mandates revision of (he approved maintenance schedule to incorporate the discard lask for bulkhead check valves. PIN 92E20-3 and