A B737-500 on final at 2300 ft executed a missed approach due to all green gear position lights inoperative in 'dim' mode ok in 'test' and 'bright.' landed using 'bright' mode.

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Attributes
ACN	488877
Time
Date	200010
Day	Sun
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : phl.airport
State Reference	PA
Altitude	msl single value : 2300
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : phl.tower
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach
Route In Use	approach : visual arrival : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 80 flight time total : 4500 flight time type : 80
ASRS Report	488877
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 13850 flight time type : 5500
ASRS Report	488076
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : gear position indication other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : landed in emergency condition
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Upon gear extension, there were no visual lights to confirm the gear was down with the lights in the 'dim' setting. With the warning lights in the 'bright' setting, we had good confirmation the gear was down and locked. Conferred with maintenance and landed uneventfully.

Original NASA ASRS Text

Title: A B737-500 ON FINAL AT 2300 FT EXECUTED A MISSED APCH DUE TO ALL GREEN GEAR POS LIGHTS INOP IN 'DIM' MODE OK IN 'TEST' AND 'BRIGHT.' LANDED USING 'BRIGHT' MODE.

Narrative: UPON GEAR EXTENSION, THERE WERE NO VISUAL LIGHTS TO CONFIRM THE GEAR WAS DOWN WITH THE LIGHTS IN THE 'DIM' SETTING. WITH THE WARNING LIGHTS IN THE 'BRIGHT' SETTING, WE HAD GOOD CONFIRMATION THE GEAR WAS DOWN AND LOCKED. CONFERRED WITH MAINT AND LANDED UNEVENTFULLY.

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.