B-737 has gear down indication problem, makes go around.

Attributes
ACN	266889
Time
Date	199403
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	tower : sfo
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing : go around
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : cfi
Experience	flight time last 90 days : 114 flight time total : 13100 flight time type : 2600
ASRS Report	266889
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
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 flight crew : returned to intended course or assigned course other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

While on the ILS approach to runway 19L at sfo, the landing gear lever was selected to the down position. The red light for the right main landing gear came on and went off, which is a normal indication. The green gear light for the right main landing gear remained off. The landing gear was cycled up and down, however, the same indication was observed. A go around was performed. The landing gear was cycled 2 more times. After the last cycling of the landing gear, a normal indication of the landing gear being down and locked was observed. The landing gear was left down for the remainder of the flight. An uneventful approach and landing was made to runway 19L.

Original NASA ASRS Text

Title: B-737 HAS GEAR DOWN INDICATION PROB, MAKES GAR.

Narrative: WHILE ON THE ILS APCH TO RWY 19L AT SFO, THE LNDG GEAR LEVER WAS SELECTED TO THE DOWN POS. THE RED LIGHT FOR THE R MAIN LNDG GEAR CAME ON AND WENT OFF, WHICH IS A NORMAL INDICATION. THE GREEN GEAR LIGHT FOR THE R MAIN LNDG GEAR REMAINED OFF. THE LNDG GEAR WAS CYCLED UP AND DOWN, HOWEVER, THE SAME INDICATION WAS OBSERVED. A GAR WAS PERFORMED. THE LNDG GEAR WAS CYCLED 2 MORE TIMES. AFTER THE LAST CYCLING OF THE LNDG GEAR, A NORMAL INDICATION OF THE LNDG GEAR BEING DOWN AND LOCKED WAS OBSERVED. THE LNDG GEAR WAS LEFT DOWN FOR THE REMAINDER OF THE FLT. AN UNEVENTFUL APCH AND LNDG WAS MADE TO RWY 19L.

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.