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DEPARTMENT OF TRANSPORTA nON NClJRRENCES 

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(DOT). AGENCY: Federal Aviation Administration (FAA), Department ofTransportation m 

# '-/--'2--)1> Airworthiness Directives; Bombardier, Inc. Model CL¥600·2CIO (Regional Jet Series 0un:"JSYMOOL JJM-fO( 1 l~lG 

### 700 & 

### 701) Airplanes, Model CL·600·2DI5 (Regional Jet Series 705) Airplanes, and 

# ,t RIN 2120-AA64

Model CL·600·2D24 (Regional Jet Series 900) Airplanes [Docket No. FAA-2009-0995; Directorate Identifier 2009-NM-123-AD; Amcodme 

# iU7.1,U7,OIO -13-[j'J39-****'*; AD 

## ****-~*-**J Federal Aviation Administration 14CFR Part 39

ACTION: Final rule. 

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### SUMMARY: We are adopting anew ain:vorthiness directive (AD) forthe products list IALSI"lG 

### above. This AD results from mandatory continuing airworthiness information (MeAl) DATE 

### originated by an aviation authority ofanother country to identify and correct anunsafe WlITTN(i SYMIlOL 

### condition on an aviation product. The MeAldescribes the unsafe condition as: INlTlAUilSIG 

### Investigation into alanding gear retraction problem on aproduction test flightrevealed that, during aircraft pressurization and depressurization cycles, the pressure floor inthe main landing gearbay deflects to a small extent. This causes relative misaligmnent between the [alternate-extension system] AES bypass valve, the dOlNIllockassist valve andthe summing lever which, inturn, canresult in damage to andpotential failure ofthe respective clevis attached to one orboth ofthe valves. Such aclevis failure could remain dormant and, inthe subsequent event that use ofthe AES was required, full landing gear extension may not be achievable. I INl1lAl.SISIG



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## *14910-I3-Pj DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 

### 14CFR Part 39 [Docket No. FAA-2009-0995j Directorate Identifier' 2009-NM·123-AD; Amendment 39-*****; AD ::<-***-**-**] RIN 2120-AA64 Ainvorthiness Directives; Bombardier, Inc. Model CL-600-2CIO (Regional Jet Series 700 & 701) Airplanes, Model CL-600-2D15 (Regional Jet Series 705) Airplanes, and Model CL-600-2D24 (Regional Jet Series 900) Airplanes AGENCY: Federal Aviation Administration (FAA), Department of Transportation (DOT). 

### ACTION: Final rule. SUMMARY: We arc adopting a new airworthiness directive (AD) for the products listed above. This AD results from mandatory continuing airworthiness information (MeAl) originated by an aviation authority of another country to identify and Corrcct an unsafe condition on an aviation product. The MeAl describes the unsafe condition as: lnvestigation into a landing gear retraction problem on aproduction test flight revealed that, during aircraft pressurization and depressurization cycles, the pressure Ooor in the main landing gear bay deflects to a small extent. This causes relative misalignment between the [alternate-extension system] AES bypass valve, the downlock assist valve and the summing lever which, in turn, can result indamage to and potentia} failure ofthe respective clevis attached to one or both of the valves. Such a clevis failure could remain dormant and, in the subsequent event that use of the AES was required, full landing gear extension may not be achievable.



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### '''', 14CFR Part 39 [Dockct No. FAA-2009w0995j Dil'ectorate Idcntilicr 2009-NM-123-AD; Amendment 39-"'***"'; All  -** -**) RIN 2120-AA64 Ainvol"thincss nif"(~ctives; Bombardier, Inc. Mode] CL-600-2ClO (Regional Jet Series 700 & 701) Airplanes, Model CL-600-2DI5 (Regional kt Series 70S) Airplntlc~, llJ1d Model CLw600-2D24 (Regional JetSeries 900) Airplanc:-i 

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ACTlON: Final rule. (DOT). ,~--

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# • originated by an IIvi<ltiollauthority ofanother l,;ountry [0identify ami COITcct<Ill unsarc AGENCY; Federal Aviation Administration (FAA), Department ofTnmsportuliol1

condition OIlI.IIl aviation product. The MeAl describes riteunsufe c()ndilion us: Investigation into nlanding gear retraction problem on a production lest flight revC<"l.led

that, during aircraft pres!:iurization and dcpn:ssurii'll1ion cycles, the pressure -floor in the main landing gear bilY deOee!s 111a SIll<lJl ex[ent.. This cnuses rclalivl::misalignment between the [alternate-extension system.l AES bypass valve, the downlock USSlslvalve 1\mlthc slHllmiflg lever which., in turn, can reSU11 in damage to und potential fniltll'c orlhe respective clevis attachcd to one orboth ofthe vulves, Such IIckvis lhillln; could remain dormant und, in the subsequcnt t.:vcnt Ibal LIseof the AES was required, fulllanding geurextension 1ll,IY 1101be achicvublc . above, This AD rc.'>llits from mandatory continuing airwOrlhiness informn[ion (MeAl) SUMMARY: We arc adopting anew nilworlhiness din:ctiv~ (AD) fhf the products li::;ted