A carj crew, on approach to tys, experienced a 'gear disagreement warning' when extending the gear, spawning a go around.

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Attributes
ACN	560519
Time
Date	200209
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : tys.airport
State Reference	TN
Altitude	msl single value : 2500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : tys.tracon tower : okc.tower
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing : go around
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 113 flight time total : 3541 flight time type : 2186
ASRS Report	560519
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : gear disagree (efis) other flight crewa other flight crewb
Resolutory Action	flight crew : executed go around other
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

To help facilitate a stabilized approach into tys, after a late descent by ATC, we selected the gear down below 250 KTS (approximately 225 KTS) and received a gear disagreement warning message. We elected to go around. The QRH was consulted and followed, resulting in 3 green down and locked gear indications. Maintenance was consulted and concurred a safe landing could be made and we landed uneventfully. ATC sent out the fire trucks but they returned after an uneventful landing.

Original NASA ASRS Text

Title: A CARJ CREW, ON APCH TO TYS, EXPERIENCED A 'GEAR DISAGREEMENT WARNING' WHEN EXTENDING THE GEAR, SPAWNING A GAR.

Narrative: TO HELP FACILITATE A STABILIZED APCH INTO TYS, AFTER A LATE DSCNT BY ATC, WE SELECTED THE GEAR DOWN BELOW 250 KTS (APPROX 225 KTS) AND RECEIVED A GEAR DISAGREEMENT WARNING MESSAGE. WE ELECTED TO GO AROUND. THE QRH WAS CONSULTED AND FOLLOWED, RESULTING IN 3 GREEN DOWN AND LOCKED GEAR INDICATIONS. MAINT WAS CONSULTED AND CONCURRED A SAFE LNDG COULD BE MADE AND WE LANDED UNEVENTFULLY. ATC SENT OUT THE FIRE TRUCKS BUT THEY RETURNED AFTER AN UNEVENTFUL LNDG.

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.