BBD Icing AD Superseded

An immediately effective Airworthiness Directive was issued by FAA last week resulting from reports of uncommanded roll during take-off of Bombardier CRJs resulting from cold weather operations. The AD seeks to prevent possible loss of control on take-off resulting from even small amounts of frost, ice...

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An immediately effective Airworthiness Directive was issued by FAA last week resulting from reports of uncommanded roll during take-off of Bombardier CRJs resulting from cold weather operations. The AD seeks to prevent possible loss of control on take-off resulting from even small amounts of frost, ice, snow, or slush on the wing leading edges or forward upper wing surfaces. Further action is expected. Owing to the urgency associated with the unsafe condition, this AD specifies a compliance time of within seven days after the April 21 effective date of this AD.
The AD supersedes an existing airworthiness directive (AD) that applies to all Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes and Model CL-600-1A11 (CL-600), CL-600-2A12 (CL-601), and CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604) series airplanes. The existing AD currently requires revising the airplane flight manuals (AFMs) to include a new cold weather operations limitation. This AD requires revising the AFMs to modify the cold weather operations limitation and include additional limitations and procedures.
Comments are due May 14.
On February 10, 2005, the FAA issued AD 2005-04-07, amendment 39-13979 (70 FR 8025, February 17, 2005). That AD resulted from a report that even small amounts of frost, ice, snow, or slush on the wing leading edges or forward upper wing surfaces can cause an adverse change in the stall speeds, stall characteristics, and the protection provided by the stall protection system.

Actions Since AD Was Issued
Since it issued that AD, Transport Canada Civil Aviation (TCCA) informed the FAA of three incidents in which Model CL-600-2B19 and CL-600-2B16 airplanes experienced uncommanded roll during take-off requiring a further revision of the aircraft flight manual limitations and procedures for cold weather or icing conditions.
Bombardier issued the temporary revisions (TRs), describing limitations that include tactile inspections for ice during certain weather conditions as well as limitations and procedures for use of wing and cowl anti-ice during certain taxiing or take-off conditions, and revised take-off limitations to reduce high-pitch attitudes during rotation. TCCA mandated the service information and issued Canadian emergency airworthiness directives CF-2008-15, dated March 7, 2008, and CF-2008-16, on March 10.
The latest AD is an interim action pending further action by TCCA including the possible development of crew awareness and training with regard to winter operations.