Large transport has gear problem on approach, go around executed.

Attributes
ACN	294215
Time
Date	199501
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : den
State Reference	CO
Altitude	agl bound lower : 1000 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : den
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : flight engineer pilot : instrument pilot : private pilot : commercial
Experience	flight time last 90 days : 245
ASRS Report	294215
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

When lowering the gear for landing at denver, front cockpit panel initially showed 3 green down and locked, then left main gear green arrow went out and associated red unsafe gear and red down arrow came on with gear warning horn (front panel only). So's panel remained 3 green down. Performed go around and accomplished checklist items. Upon lowering gear again, same indications existed. Switched to system #2 and landed without problems. Coordinated go around and second approach with tower and approach control.

Original NASA ASRS Text

Title: LGT HAS GEAR PROB ON APCH, GAR EXECUTED.

Narrative: WHEN LOWERING THE GEAR FOR LNDG AT DENVER, FRONT COCKPIT PANEL INITIALLY SHOWED 3 GREEN DOWN AND LOCKED, THEN L MAIN GEAR GREEN ARROW WENT OUT AND ASSOCIATED RED UNSAFE GEAR AND RED DOWN ARROW CAME ON WITH GEAR WARNING HORN (FRONT PANEL ONLY). SO'S PANEL REMAINED 3 GREEN DOWN. PERFORMED GAR AND ACCOMPLISHED CHKLIST ITEMS. UPON LOWERING GEAR AGAIN, SAME INDICATIONS EXISTED. SWITCHED TO SYS #2 AND LANDED WITHOUT PROBS. COORDINATED GAR AND SECOND APCH WITH TWR AND APCH CTL.

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.