B757 right main gear green light would not illuminate prior to landing.

Attributes
ACN	352167
Time
Date	199611
Day	Wed
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mco
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : mco
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : instrument pilot : flight engineer
ASRS Report	352167
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

With the gear handle down, the left main gear indication (green) lights were blank. We tested the lights -- still blank. We had no gear messages, and no gear horn. Msp maintenance control said the gear had to be down and locked. We agreed. We did a fly-by with the tower and a spotter from airport operations at the approach end spotlighting our gear. All agreed it appeared down. We changed bulbs with the right main but we still had a blank indication. There were no new correct bulbs to use. We had the equipment standing by and made a normal landing. Maintenance control said there was no reason to prepare the cabin for a gear collapse. Later when maintenance changed the bulbs again, they were still blank until he started shaking them.

Original NASA ASRS Text

Title: B757 R MAIN GEAR GREEN LIGHT WOULD NOT ILLUMINATE PRIOR TO LNDG.

Narrative: WITH THE GEAR HANDLE DOWN, THE L MAIN GEAR INDICATION (GREEN) LIGHTS WERE BLANK. WE TESTED THE LIGHTS -- STILL BLANK. WE HAD NO GEAR MESSAGES, AND NO GEAR HORN. MSP MAINT CTL SAID THE GEAR HAD TO BE DOWN AND LOCKED. WE AGREED. WE DID A FLY-BY WITH THE TWR AND A SPOTTER FROM ARPT OPS AT THE APCH END SPOTLIGHTING OUR GEAR. ALL AGREED IT APPEARED DOWN. WE CHANGED BULBS WITH THE R MAIN BUT WE STILL HAD A BLANK INDICATION. THERE WERE NO NEW CORRECT BULBS TO USE. WE HAD THE EQUIP STANDING BY AND MADE A NORMAL LNDG. MAINT CTL SAID THERE WAS NO REASON TO PREPARE THE CABIN FOR A GEAR COLLAPSE. LATER WHEN MAINT CHANGED THE BULBS AGAIN, THEY WERE STILL BLANK UNTIL HE STARTED SHAKING THEM.

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.