B757-200 crew did not have the right main gear show down and locked.

Attributes
ACN	573443
Time
Date	200302
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sea.airport
State Reference	WA
Altitude	msl single value : 3000
Environment
Light	Night
Aircraft 1
Controlling Facilities	tracon : s46.tracon tower : sea.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	descent : approach landing : go around
Route In Use	approach other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	573443
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : lndg gear indicating other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : issued advisory flight crew : executed missed approach other
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After extending landing gear on approach, no gear down green light illuminated for right main. Tested light and determined bulb was not burnt out. Executed go around, performed gear disagreement abnormal procedure. Still no green light for right main. After visual verification by airport ground personnel that gear appeared to be extended, landed runway 16L without incident. Maintenance personnel met aircraft and indicated suspected problem was in defective light circuit for right main.

Original NASA ASRS Text

Title: B757-200 CREW DID NOT HAVE THE R MAIN GEAR SHOW DOWN AND LOCKED.

Narrative: AFTER EXTENDING LNDG GEAR ON APCH, NO GEAR DOWN GREEN LIGHT ILLUMINATED FOR R MAIN. TESTED LIGHT AND DETERMINED BULB WAS NOT BURNT OUT. EXECUTED GAR, PERFORMED GEAR DISAGREEMENT ABNORMAL PROC. STILL NO GREEN LIGHT FOR R MAIN. AFTER VISUAL VERIFICATION BY ARPT GND PERSONNEL THAT GEAR APPEARED TO BE EXTENDED, LANDED RWY 16L WITHOUT INCIDENT. MAINT PERSONNEL MET ACFT AND INDICATED SUSPECTED PROB WAS IN DEFECTIVE LIGHT CIRCUIT FOR R MAIN.

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.