A B737-300 right main gear position indication alternating between red and green with the landing gear extended. Found faulty downlock sensor.

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Attributes
ACN	641173
Time
Date	200412
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 2400
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 220
ASRS Report	641173
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : log gear position indication other flight crewa other flight crewb
Resolutory Action	aircraft : equipment problem dissipated flight crew : overcame equipment problem
Consequence	other other
Supplementary
Primary Problem	Aircraft

Narrative:

Right main landing gear red and green light alternating on with gear handle down. With throttle at idle gear warning horn on, recycle and all indications normal. Normal landing. Reported to maintenance and aircraft taken OTS for further testing. Callback conversation with reporter revealed the following information: the reporter said maintenance replaced the right main gear downlock sensor, jacked and swung gear, checks ok and returned to service.

Original NASA ASRS Text

Title: A B737-300 R MAIN GEAR POS INDICATION ALTERNATING BTWN RED AND GREEN WITH THE LNDG GEAR EXTENDED. FOUND FAULTY DOWNLOCK SENSOR.

Narrative: R MAIN LNDG GEAR RED AND GREEN LIGHT ALTERNATING ON WITH GEAR HANDLE DOWN. WITH THROTTLE AT IDLE GEAR WARNING HORN ON, RECYCLE AND ALL INDICATIONS NORMAL. NORMAL LNDG. RPTED TO MAINT AND ACFT TAKEN OTS FOR FURTHER TESTING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID MAINT REPLACED THE R MAIN GEAR DOWNLOCK SENSOR, JACKED AND SWUNG GEAR, CHKS OK AND RETURNED 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.