CL65 returns to departure airport when captain and first officer flight instruments give erroneous i...

Attributes
ACN	793869
Time
Date	200807
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65 Undifferentiated or Other Model
Operating Under FAR Part	Part 119
Navigation In Use	other
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 220 flight time total : 3200 flight time type : 2100
ASRS Report	793869
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

I made the decision to declare an emergency and return to ZZZ after my flight instruments and the first officer's flight instruments began giving erroneous information. The checklist did not remedy the problem. I believe the source of the problem was both air data computers.

Original NASA ASRS Text

Title: CL65 RETURNS TO DEP ARPT WHEN CAPT AND FO FLT INSTRUMENTS GIVE ERRONEOUS INFORMATION.

Narrative: I MADE THE DECISION TO DECLARE AN EMER AND RETURN TO ZZZ AFTER MY FLT INSTS AND THE FO'S FLT INSTS BEGAN GIVING ERRONEOUS INFO. THE CHKLIST DID NOT REMEDY THE PROB. I BELIEVE THE SOURCE OF THE PROB WAS BOTH AIR DATA COMPUTERS.

Data retrieved from NASA's ASRS site as of May 2009 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 returns to departure airport when captain and first officer flight instruments give erroneous information.