A canadair cl-65 rejected takeoff at 60 knots due to a stall fail caution message.

Attributes
ACN	503598
Time
Date	200103
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : day.airport
State Reference	OH
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : day.tower
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	ground : takeoff roll
Route In Use	departure : other published ifr departure
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 4100 flight time type : 1600
ASRS Report	503598
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : stall warning other flight crewa other flight crewb
Resolutory Action	aircraft : automation overrode flight crew flight crew : rejected takeoff
Supplementary
Problem Areas	Company Aircraft Environmental Factor
Primary Problem	Company
Situations
Publication	FLT OPS MANUAL

Narrative:

During takeoff on 24L in day, we received a 'stall fail' caution message at 60 KIAS. This resulted in an rejected takeoff. After clearing the runway we discover that the airline designated this situation on some aircraft under certain conditions to be normal, and the takeoff may be continued. We then waited for brake cooling and departed with the same (apparently erroneous) message illuminating. I feel a problem may be in the works by allowing this to go on. What if it is a true failure? How are we to know the difference? Callback conversation with reporter revealed the following information: the reporter stated the problem is a recent upgrade modification to the stall warning system that has been accomplished on one-half of the fleet. The reporter said the stall warning computer senses the slight differences of the stall warning vanes under certain conditions and triggers the 'stall fail' caution message. The reporter stated the flight operations manual makes a note of this condition and allows the crew to ignore the warning or react to the warning. The reporter said this is confusing as the condition of the stall warning system is in doubt. The reporter said the airplane with this modification is not placarded to alert crews to this situation.

Original NASA ASRS Text

Title: A CANADAIR CL-65 REJECTED TKOF AT 60 KNOTS DUE TO A STALL FAIL CAUTION MSG.

Narrative: DURING TKOF ON 24L IN DAY, WE RECEIVED A 'STALL FAIL' CAUTION MSG AT 60 KIAS. THIS RESULTED IN AN RTO. AFTER CLRING THE RWY WE DISCOVER THAT THE AIRLINE DESIGNATED THIS SIT ON SOME ACFT UNDER CERTAIN CONDITIONS TO BE NORMAL, AND THE TKOF MAY BE CONTINUED. WE THEN WAITED FOR BRAKE COOLING AND DEPARTED WITH THE SAME (APPARENTLY ERRONEOUS) MSG ILLUMINATING. I FEEL A PROB MAY BE IN THE WORKS BY ALLOWING THIS TO GO ON. WHAT IF IT IS A TRUE FAILURE? HOW ARE WE TO KNOW THE DIFFERENCE? CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE PROB IS A RECENT UPGRADE MODIFICATION TO THE STALL WARNING SYS THAT HAS BEEN ACCOMPLISHED ON ONE-HALF OF THE FLEET. THE RPTR SAID THE STALL WARNING COMPUTER SENSES THE SLIGHT DIFFERENCES OF THE STALL WARNING VANES UNDER CERTAIN CONDITIONS AND TRIGGERS THE 'STALL FAIL' CAUTION MSG. THE RPTR STATED THE FLT OPS MANUAL MAKES A NOTE OF THIS CONDITION AND ALLOWS THE CREW TO IGNORE THE WARNING OR REACT TO THE WARNING. THE RPTR SAID THIS IS CONFUSING AS THE CONDITION OF THE STALL WARNING SYS IS IN DOUBT. THE RPTR SAID THE AIRPLANE WITH THIS MODIFICATION IS NOT PLACARDED TO ALERT CREWS TO THIS SIT.

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.