A dassualt falcon 20 received 2 gear down lights and followed procedures with a normal landing.

Attributes
ACN	436946
Time
Date	199905
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Altitude	msl bound lower : 500 msl bound upper : 1000
Environment
Flight Conditions	VMC VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : sfo.tower
Operator	general aviation : corporate
Make Model Name	Falcon 20FJF/20C/20D/20E/20F
Operating Under FAR Part	Part 91
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 60 flight time total : 5950 flight time type : 900
ASRS Report	436946
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : executed go around
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

My crew and I were on final to sfo runway 28R in a dassault falcon 20. Upon extending the landing gear, I noticed that there was only 2 of 3 green down and locked indications. After testing the circuit, I realized that it could be a burnt out bulb, at which time I elected to do a go around to do checklist procedures. After landing and having maintenance verify the problem, it turned out to be a burnt bulb, at which time the mechanic replaced the bad bulbs with new ones and returned the aircraft to service.

Original NASA ASRS Text

Title: A DASSUALT FALCON 20 RECEIVED 2 GEAR DOWN LIGHTS AND FOLLOWED PROCS WITH A NORMAL LNDG.

Narrative: MY CREW AND I WERE ON FINAL TO SFO RWY 28R IN A DASSAULT FALCON 20. UPON EXTENDING THE LNDG GEAR, I NOTICED THAT THERE WAS ONLY 2 OF 3 GREEN DOWN AND LOCKED INDICATIONS. AFTER TESTING THE CIRCUIT, I REALIZED THAT IT COULD BE A BURNT OUT BULB, AT WHICH TIME I ELECTED TO DO A GAR TO DO CHKLIST PROCS. AFTER LNDG AND HAVING MAINT VERIFY THE PROB, IT TURNED OUT TO BE A BURNT BULB, AT WHICH TIME THE MECH REPLACED THE BAD BULBS WITH NEW ONES AND RETURNED THE ACFT TO SVC.

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.