[4910-I3-PJ

DEPARTMENT OF TrNSPORTATION

Federal Aviation Administration

14 CFR Part 39

Ol.f3G

[Docket No. FAA-2010-*****; Directorate Identifier 2009-NM-230-AD]

R1N 2120-AA64

Ainvorthiness Directives; Bombardier, Inc. Model CL-600-2B 19 (Regional Jet Series

100 & 440) Airplanes

AGENCY: Federal Aviation Administration (FAA), DOl"

ACTION: Notice of proposed ruJemaking (NPRM). i

l

..

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

listed above. This proposed AD results from mandatory rOlltinUing airworthiness

information (MCAl) 01iginated by an aviation authorilY ranother country to identify

and correct an unsafe condition on an aviation product. The MeAl describes the unsafe

condition as:

I

* * * There have recently been several in-service occurrences that have

highlighted the1inability of the existing [wing ~ Ii-ice] system to detect a

low-heat condition in the wing leading edge at aLltimes, with the potential

consequence of unannunciated asymmetric ice bfuld-up on the wing. * * *

Such a condition, in combination with maneuverF close to stick shaker

activatioll_,could possibly result in reduced cOllJllability oftbe aircraft.

* * * * ~I. * *

The proposed AD would require actions that are intended to address the unsafe conditi

described in the MeAl.

DATES: We must receive comments on this propose'd by [INSERT DATE 45

DAYS AFTER DATJ OF PUBLICATION IN THE ~ DERAL REGISTER].

N~1JRR""C~S

ROUTIN'HY"IIOL

WI/.\.-t

C~

':{(1/l( (0

l,fTING SYMIlOI.

N-<W\ -\1'1'

•

ROlImlG SYMIIOL

n

,-,

NmMSlSlG

>AT.

"" •••• "ffiI() SYMBOL

m
ACTJON: Notice of proposed rulcmaking (NPRM).

Airw()f1hincs~ Dircdrves; Bombardier. Inc. Modd CL-600.:m 19 (Regional .let Seri('~

SVMMARY: We propose to adopt a new airv.'orthim .•ss irecli\'~ (AD) for the product!>

I'.'------- ,'n" <"-',

/J/~\-

~~}jd-ilO;<

\491 O-_13-1~I ,"'~'''''''''''''''',' ". "'J',,_ "-'1M."

ANl:'·

In'Wt"hlll1

,~,,;.J::!.'---... IlEI'ARTMENT OF TRANSPORT ATlON

IDocket No. FAA-2010-'!<**ItI<; Directorate .Identifier 2009-NM-BO-A.l>1

rcdrral A\'iglion Admill~~tranOfl

IUN 2120-A1\64

liste-<.1abovc. This prop()~cd AD results from mandatory c ntinuing ai"vorthiness

I

information (MeAl) origimncd by an aviation authtlrily or another country t() Identify

and correct an unsafe C<lnl1ition on an aviation produl.:\. Tne MeAl describes the unsafe

AGENCY: r~'deral Aviation Admit,istral'ion (FAA). DOT.

100 & 440) Airplanes

14 CFR Port 39

conl1ilion as:

'" 1'.~ There h,l\'c recently been scve~1 iJl-Service 1CCUH~.l1Ce~that, h;we

highlighted the .inability Oflhc eXlsl'ing [wing anti-ice) system lO dl2ltCl~t.l

low-IH:nt condition in the wing le:"ding edge at a1l1imes. with lht' poterrlial

consequence of unannunciatcd asymmetric ice build-up 011 the \\'ing. *' '!< ••

Such ••condition. in combination v.rithmaneuvers close In st.ick shaker

activatioll. could possibly resuh in reduced control ability or IJle aircraft .

..__ .- ~"-'

"'-j]'

IJ("''''~~••,,"'"

• • • • • •

• <

Thc proposl'd AD would require aClions Ihat 'ire intcnded [0 ad(lrl~:O;stl1e unsal'e conc!irion '."fl·',·""

described in the MeAl. J

OATES; We.must receive commeTHs on this proposed A hy [lNSfRT DA n:. 45