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DEPARTMENT OF TRANSPORTATION

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14 CFR Part 39

Federal Aviation Administration

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[Docket No. FAA-2010-*****; Directorate Identifier 2009-NM-265-AD)

RIN 2120-AA64

Ainvorthiness Directives; Bombardier, Inc. Model CL-600-2CIO (Regional Jet Series

700,701, & 702) Airplanes, Model CL-600-2DI5 (Regional Jet Series 705) Airplanes,

and Model CL-600-2D24 (Regional Jet Series 900) Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

SUMMARY: We propose to adopt a new airworthiness directive (AD) for the product

listed above that would supersede an existing AD. This proposed AD results from

mandatory continuing airworthiness information (MeAl) originated by an aviation

authority of another country to identify and correct an unsafe condition on an aviation

product. The MeAl describes the unsafe condition as:

The beating capability of several (angle of attack] ADA transducer

heating elements removed from in-service aircraft has been found

to be below the minimum requirement. Also, it was discovered that

a large number of ADA transducers repaired in an approved

maintenance facility were not calibrated accurately.

Inaccurate calibration of the ADA transducer and/or degraded

ADA transducer heating elements can result in early or late

activation of the stall waming, stick shaker and stick

pusher by the Stall Protection Computer (SPC).

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Inaccurate calibration of the ADA transducers and/or degraded ADA transducer heating _
m~PARTMENT OF T1lANSPORTA nON

Federal Aviation Administration

14 CPR Part 39

[Docket No. FAA~201 O_Hi.'t.*; "Directorate Identifier 2009·NM-265-AOI

RlN 2I20-AA64

Airworthiness Directives; Bombardier. Inc. Model CL-600-2Cl 0 (Regional Jet Serks

700. 70 I & 702) Airpl •.mes, Model CI 600·2DI5 (Regional Jet Series 705) Airplanes,

and Model CL-600-2D24 (Regional Jet Series 900) Airplan~

AGENCY: Federal Aviation Administration (FAA), DOT.

,

ACTION: Notice of proposed rulcmaking (NPRM).

StJMMARY: We propose to adopt a new airworthiness directive (AD) for the producLS

listed above that would supersede. 3n existing AD. This proposed AD results from

mam.lalory continuing run"mthiness information (MeAl) originated by an aviation

aULhority of another country to identify and correel ~n unsafe conditlo11 on an aviation

prod\lc!'. The MeAl describes the unsafe condition as:

The heating capability ofsevcraJ [angle oJauackJ AOA lransducer

heating elements removed from in·senice aircraft has bt:en found

to be below the minimum requirement. AlsQ. il "vas discoverltd Lhat

a large number of AOA transducers repaired in an approved

maintenance fucility were not calibrtned accuralely.

Inaccurate calibration of l,beAOA transducer andJor degraded

AOA transducer hCflting clements can result in early or lafe

aClivation of the stall ""llrning, slick shaker and stick

pusher by tl,c Stall Protection Computer (SPC).

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