Large transport has gear unsafe light on approach to landing.

Attributes
ACN	275214
Time
Date	199406
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 1100 msl bound upper : 1100
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sfo
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 15000 flight time type : 4000
ASRS Report	275214
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

When landing gear was lowered, the left main indicated unsafe. Red light illuminated and no green light. A go around was initiated. The abnormal procedure was completed. The gear was checked down and locked visually. An emergency was declared. An uneventful landing was made. The aircraft was stopped on the runway. The gear was pinned. The aircraft was towed to the gate.

Original NASA ASRS Text

Title: LGT HAS GEAR UNSAFE LIGHT ON APCH TO LNDG.

Narrative: WHEN LNDG GEAR WAS LOWERED, THE L MAIN INDICATED UNSAFE. RED LIGHT ILLUMINATED AND NO GREEN LIGHT. A GAR WAS INITIATED. THE ABNORMAL PROC WAS COMPLETED. THE GEAR WAS CHKED DOWN AND LOCKED VISUALLY. AN EMER WAS DECLARED. AN UNEVENTFUL LNDG WAS MADE. THE ACFT WAS STOPPED ON THE RWY. THE GEAR WAS PINNED. THE ACFT WAS TOWED TO THE GATE.

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.