CL65 declares emergency after EICAS messages combined with aircraft control problems start adding up...

Attributes
ACN	463589
Time
Date	200002
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : cvg.airport
State Reference	KY
Altitude	msl bound lower : 10000 msl bound upper : 27000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude climbout : vacating altitude
Route In Use	enroute : direct
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 150 flight time total : 4200 flight time type : 2200
ASRS Report	463589
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical inflight encounter : weather other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eicas
Resolutory Action	controller : issued new clearance flight crew : exited adverse environment flight crew : landed in emergency condition flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft Environmental Factor Weather
Primary Problem	Aircraft

Narrative:

On climb out (approximately 10000 ft), crew got an 'anti ice duct' warning. Message cleared as wing anti-ice system was turned off. QRH procedure was completed and aircraft left icing conditions and did not re-enter icing conditions. After consulting with maintenance and dispatch, crew decided to return to cvg. As aircraft was turning towards cvg, EICAS indicated 'autoplt trim is rwd.' caution message was intermittent. After disconnecting autoplt, ailerons felt very stiff although responding correctly. Increasing pressure on ailerons attempting to bank the airplane resulted in a 'snap' and aircraft rolled sharply. Immediately returned ailerons to neutral. Another attempt to bank had same result. Emergency was declared. Aileron problem seemed to clear itself and flight controls were normal for remainder of flight. Visual approach and landing was made without incident. Contributing factors: 1) 5 days prior, aircraft had same 'anti ice duct' warning. 2) airplane sat on taxiway in heavy rain for over 1 hour prior to departure. I do not suspect that the anti-ice problem and the aileron abnormality are related.

Original NASA ASRS Text

Title: CL65 DECLARES EMER AFTER EICAS MESSAGES COMBINED WITH ACFT CTL PROBS START ADDING UP. RETURNS TO CVG.

Narrative: ON CLBOUT (APPROX 10000 FT), CREW GOT AN 'ANTI ICE DUCT' WARNING. MESSAGE CLRED AS WING ANTI-ICE SYS WAS TURNED OFF. QRH PROC WAS COMPLETED AND ACFT LEFT ICING CONDITIONS AND DID NOT RE-ENTER ICING CONDITIONS. AFTER CONSULTING WITH MAINT AND DISPATCH, CREW DECIDED TO RETURN TO CVG. AS ACFT WAS TURNING TOWARDS CVG, EICAS INDICATED 'AUTOPLT TRIM IS RWD.' CAUTION MESSAGE WAS INTERMITTENT. AFTER DISCONNECTING AUTOPLT, AILERONS FELT VERY STIFF ALTHOUGH RESPONDING CORRECTLY. INCREASING PRESSURE ON AILERONS ATTEMPTING TO BANK THE AIRPLANE RESULTED IN A 'SNAP' AND ACFT ROLLED SHARPLY. IMMEDIATELY RETURNED AILERONS TO NEUTRAL. ANOTHER ATTEMPT TO BANK HAD SAME RESULT. EMER WAS DECLARED. AILERON PROB SEEMED TO CLR ITSELF AND FLT CTLS WERE NORMAL FOR REMAINDER OF FLT. VISUAL APCH AND LNDG WAS MADE WITHOUT INCIDENT. CONTRIBUTING FACTORS: 1) 5 DAYS PRIOR, ACFT HAD SAME 'ANTI ICE DUCT' WARNING. 2) AIRPLANE SAT ON TXWY IN HVY RAIN FOR OVER 1 HR PRIOR TO DEP. I DO NOT SUSPECT THAT THE ANTI-ICE PROB AND THE AILERON ABNORMALITY ARE RELATED.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

CL65 declares emergency after EICAS messages combined with aircraft control problems start adding up. Returns to cvg.