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DEPARTMENT OF TRANSPORTA nON Federal Aviation Administration =~CURRENCE3

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ACTION: Notice ofproposed rulemaking (NPRM). AGENCY: Federal Aviation Administration (FAA), DOT. 

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### 702), CL-600-2D15 (Regional Jet Series 705), and CL·600-2D24 (Region



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# ob31 [Docket No. FAA-WTO'-*****; Directorate Identifier 2010-NM-135-AD)

SUMMARY: Wepropose toadopt anew airworthiness directive (AD) fortheproduct Jet Series 900) Airplanes Airworthiness Directives; Bombardier, Inc. Model CL-600~2C 1

# a (Regional Jet Serie RlN 2120·AA64 14CFR Part 39

listed above. This proposed AD results from mandatory continuing airworthiness information (MeAl) 

### originated by

### an aviation authority ofanother country to identify [lATE 

### and correct an unsafe condition on an aviation product. The MCAI describes the unsafi condition as: There have been two reported cases offailure oftheMLG [main landing gear] piston axle, 

### PIN [part number] 49203-3 or49203-5, resulting from fretting between the inboard axle sleeve and axle thrust face, damage to theprotective coating and consequent stress corrosion. Inbotb cases, the MLG did not collapse. ,"mAtS'S'G~A1URE
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# , , , , , , The unsafe condition isfailure ofthe MLG, whicb could adversely affect the airplane' '"ITl'I.""'''''~' fURE 

### safe landing. The proposed AD would require actions that are intended to address the unsafe condition described inthe MCAL

FAA Form 1360-14.1 (6-89) OFFICIAL FILE COPY \~ U,S. GOVERNIAENT PRINTING OFFICE; 1995 - 769·211

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ANE-171 DEPARTMENT OFTRANSPORTATION t~"LA,-,.'_"r; CYal Federal Aviation Administration 14CFR Part 39 LGB-AEG 

### 1'"L.\l."''''' [Docket No. FAA-201O-*****; Directorate Identifier 2010-NM-135-AD] M it ''-''. 

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ANE-171 /

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## !~/rO/:z.<}1·7 RIN 2120-AA64
700.701, &702), CL-600-2DI5 (Regional Jet Series 705), and CL·600~2D24 (Regional ".", Jet Series 900) Airplanes Ainvorthiness Directives; Bombardier. Inc. Model CL-600~2CI0 (Regional Jet Series

ACENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM). "{"]'I"" •..••'"'''' SLJMMARY: We propose to adopt a new airworthiness directive (AD) for {heproducts ANE·170 

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## 1,'·_1_~o.~ia.',_,Q:._ Iste a ave. This proposed AD results Irom mandatory continuing airworlhiness ~ ~ ~

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### ",,,. "\ information (MeAl) originated by an aviation authority of another country to identify \iJ. \

## t..\0 "<1\11'M' ",-,.""" and correct an unsafe condition on an aviation product. The MeAl describes the unsafe condition as: LlI II, There have been twa reported cases offailure olthe MLG [main landing gear] piston axle, 

### PIN [part nLLmber]49203-3 or49203-5, resulting from fretting bet\'/een (he inboard axle sleeve and axle thrusl face, damage to Iheprotective coating and consequent stress corrosion. Inboth cases. the MLG did not collapse. 

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# , , , The unsare condition is failure ofthe MLG. which could adversely affect the airplane's
sare landing. The proposed AD would require actions that are intended 10 address the unsafe condition described in the MeAL