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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR 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.

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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 of proposed 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 of the stall protection system to

detect degradation of the stick pusher function. It also introduces a new

repetitive maintenance task to limit exposure to dormant failure of the

stick pusher capstan shaft.

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Donnant loss or severe degradation of the stick pusper flO1ction ~ould result in reduced

controllability of the 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

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[4910-13-P)

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR 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 of proposed rulemaking (NPRM) ..

SUMMARY: We propose to adopt a nevi airworthiness directive (AD) for the products

.listed" above. This nroposed AD results from mandatory continuing airworthiness

information (MeAl) originated by aq aviation authority of another country to identify

aild ·correct.an-unsaft; condition on an aviation prod~Cl The MeAl describes the unsafe

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condition as:

There have been several Stick Pusher Capstan Shaft failnres causing

severe degradation of the stick pusher function. This directive is issued to

revise the first flight of the day check of the stall protection system to

detect"degradation of the s.tick pusher function. It also introduces a new

!" repetitive maintenance task to limit exposure to dOJ!llant failure of the

'stick pusher capstan ·shaft.

Dormant loss or severe degradation of the stick pusher fun~tjon could result in reduced

controllability of the 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 on this proposed AD by [INSERT DATE 45

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