A B737-200 crew experienced an unsafe left main landing gear indication. A safe landing followed.

Attributes
ACN	640713
Time
Date	200412
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 1500
Environment
Flight Conditions	VMC
Light	Dawn
Aircraft 1
Controlling Facilities	tower : zzz.tower tower : elp.tower
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 17000 flight time type : 10000
ASRS Report	640713
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Experience	flight time last 90 days : 100 flight time total : 2500 flight time type : 200
ASRS Report	641184
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : gear warning
Resolutory Action	flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

During approach with landing gear down, 2 green lights and 1 left gear red light. Declared emergency and had emergency equipment standing by. All other indications showed that the gear was down. No problems on landing.

Original NASA ASRS Text

Title: A B737-200 CREW EXPERIENCED AN UNSAFE L MAIN LNDG GEAR INDICATION. A SAFE LNDG FOLLOWED.

Narrative: DURING APCH WITH LNDG GEAR DOWN, 2 GREEN LIGHTS AND 1 L GEAR RED LIGHT. DECLARED EMER AND HAD EMER EQUIP STANDING BY. ALL OTHER INDICATIONS SHOWED THAT THE GEAR WAS DOWN. NO PROBS ON 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.