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Fcdl'raJ Aviatillll Administration 14CFH. P"rt 39 \Docket No. FAA-201 0-0276; Dircc1tlrlltc Identifier 2009-NM-.I44~AJ); Amendment 

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# i7 3 ~*"*"*; AD 2011.I~H_**1 IUN 2120-AA64 Airworthiness .oil·cctivcs; BombardiL'l", Inc. Model CL-600-2l:J 19 (Regional .let SCI'ies 100 & 440) /\irplanes AGENCY: Federal Aviation Administralion (FAA), f)CP[lfllllClli ofTnmsportatinn (00'1). ACTION: Fin;,) rule. SUMMAnv: We are superseding <111 existing ain.•.• onhincss dircctin: (AD) tor{he prodm:1S llstcd above. This AD results 

### Irom mandatory continuing. airworthiness in!i.)J']nati()1l(MeA!) originated byan avialion authority of anoth,,;l' count ry to iden!i fy and correct:ln tlllsalC condition on allllvialioll product. The MeA! describes \he ut1:>ufc tonditiOI1 ,1S: "'''''".C. ,,,•• <. ANE-171

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## ,~--.l::ll'l Three cases or in-l1ight loss of etlbin pressurization bave been reponed, resulting from failure of abulkhcad check valve in combination wiLh raitun.: of an air supply ducL In audilion 10mandating inspecljoll. rework and/or rc:plal:cmcnt tll"the air supply dUCIS,Ainvol1hiness Directive (AD) Cf-200)-OS (subsequently revised to CF-2003-05RI) lwhich corresponds to FAA AI) 2004-22-08] lUnlldu!edthe incorporation ofa 4000 mght-hour repetiti ve inspection task for hulkhead eheek valves. PartNumbers (PiN) 92E20-3 and 92E20-4, inll}lhe approved maintenance schedule. However, this repetilive Inspection task has since heen superseded by <l 3000 flighl-hour periodic[491Q-13-P) 

### DEPARTMENT OF TRAi\lSPORT AnON Federal Aviation Administration 14CFR Part 39 (Docket No. FAA-2010-0276; Directorate Identifier 2009-NM-144-AD; Amendme 39-*****' AD 2010-**-**] 

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### RIN 2120-AA64 . lJIlNO S"MBOl
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### Airwortbiness Directives; Bombardier, Inc. Model CL-600-28 19(Regional Jet Series RO\n'lNCsnIflOt 

### 100 &440) Airplanes AGENCY: Federal Aviation Administration (FAA), Department ofTransportation (DOT). 

### ACTION: Final rule. SUMMARY: We are superseding an existing airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness infonnation (MeAl) originated byan aviation authority of another country to identify IlATE 

### and correct an unsafe condition on an aviation product. The MCAI describes the unsafi condition as: Three cases of in-flight loss ofcabin pressurization have been reported, resulting from failure of abulkhead check valve in combination with failure of an air supply duct. In addition to mandating inspection, rework and/or replacement ofthe air supply ducts, Airworthiness Directive (AD) CF-2003-05 (subsequently revised to CF-2003-05RI) [which corresponds 10 

### FAA AD 2004-22-08] mandated the incorporation ofa4000 flight-hour repetitive inspection task for bulkhead check valves, Part Numbers (PIN) 92E20-3 and 92E20-4, 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. , "OU1'ING S\'MH<)L
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