### 14910-13-PJ CDNCU"REm, ROUTINGSVM"U" ANE-I72 

### DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 

### 14CFR Part 39 [Docket No. FAA-2010-*****; Directorate Identifier 2009wNM-225-ADJ 

### !UN 2120-AA64 Airworthiness Directives; Bombardier, Inc. Model CL-600-2B 19 (Regional Jet Series 100 &440) Aicplanes AGENCY: Federal Aviation Administration (FAA), DOT. ANE-l72

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and correct an unsafe condition on an aviation product. The MCAI describes the unsafe SUMMARY: We propose to adopt a new airworthiness directive (AD) for the products ACTION: Notice ofproposed rulemaking (NPRM).
listed above. This proposed AD results from mandatory continuing airworthiness information (MeAl) originated by an aviation authority of another country to identify
condition as: There have been several Stick Pusher Capstan Shaft failtrres causing severe degradation of the stick pusher function. This directive is issued to revise the first flight of the day check ofthe stall protection system to detect degradation of the stick pusher function. It also introduces anew repetitive maintenance task to limit exposure to dormant failure of the stick pusher capstan shaft. 

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__ /1<> Donnant loss or severe degradation of the stick pusper flO1ction~ould result in reduced controllability ofthe airplane. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAL DATES: We must receive comments on this proposed AD by [INSERT DATE 45 ROUTING SYMBOl[4910-13-P) DEPARTMENT OF TRANSPORTATION Federal AviationAdministration 14CFR Part 39 [Docket No. FAA·2010-*****; Directorate Identifier 2009-NM-225-ADI RIN 2120-AA64 Airworthiness Directives; Bombardier, Inc. Model CL-600-2B 19 (Regional Jet Series 100 &440) Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. ACTION: Notice ofproposed rulemaking (NPRM) .. SUMMARY: We propose to adopt anevi airworthiness directive (AD) for the products

.listed"above. This nroposed AD results from mandatory continuing airworthiness information (MeAl) originated byaq aviation authority ofanother country toidentify aild ·correct.an-unsaft; condition on an aviation prod~Cl The MeAl describes the unsafe \condition as: There have been several Stick Pusher Capstan Shaft failnres causing severe degradation ofthe stickpusher function. This directive is issued to revise the first flight ofthe day check of the stallprotection system to detect"degradation ofthe s.tickpusher function. Italso introduces anew !" repetitive maintenance task tolimit exposure to dOJ!llantfailure of the 'stick pusher capstan ·shaft. Dormant loss or severe degradation ofthe stick pusher fun~tjon could result inreduced controllability ofthe airplane. The proposed AD·w·ould require actions that arc intended

.to addtess-the unsafe condition described in the MeAt. DATES: We must receive comments onthis proposed AD by [INSERT DATE 45 

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