A TBM800 pilot received three green and one red light indications after extending the landing gear. ...

Narrative:

Upon extending the landing gear on final approach for landing I got a 3 green indication with a steady red light remaining on. I aborted the landing and as I flew by the control tower I asked them to visually check to see if the gear appeared to be down. The tower confirmed that the gear appeared to be down. In this aircraft; a steady red light with 3 greens is not an unsafe gear indication. However; emergency checklist requires a manual gear extension.I then asked for vectors to a safe altitude and ran through the emergency checklist which included a manual gear extension. I powered to idle momentarily to see if a horn would go off that indicates that the gear is not down and locked and got no horn. I asked the tower to have the fire trucks on standby for the uneventful landing.after landing I verbally gave the fire truck operator the info that he requested and contacted maintenance control to see if the plane could be flown safely back to our home base. In the meantime; our manager of flight operations spoke with the tbm service center. Discussions centered on whether the gear was down and locked and in a safe condition. This was determined to be the case.the plane was flown gear down to our maintenance base for troubleshooting. They put the aircraft on jacks and determined that it was a sticky switch on the left main gear that created the improper illumination of the steady red light.

Original NASA ASRS Text

Title: A TBM800 pilot received three green and one red light indications after extending the landing gear. A safe landing ensued and Maintenance determined the red light was caused by a sticking gear unsafe switch on the left main gear.

Narrative: Upon extending the landing gear on final approach for landing I got a 3 green indication with a steady red light remaining on. I aborted the landing and as I flew by the Control Tower I asked them to visually check to see if the gear appeared to be down. The Tower confirmed that the gear appeared to be down. In this aircraft; a steady red light with 3 greens is not an unsafe gear indication. However; emergency checklist requires a manual gear extension.I then asked for vectors to a safe altitude and ran through the emergency checklist which included a manual gear extension. I powered to idle momentarily to see if a horn would go off that indicates that the gear is not down and locked and got no horn. I asked the Tower to have the fire trucks on standby for the uneventful landing.After landing I verbally gave the fire truck operator the info that he requested and contacted Maintenance Control to see if the plane could be flown safely back to our home base. In the meantime; our Manager of Flight Operations spoke with the TBM Service Center. Discussions centered on whether the gear was down and locked and in a safe condition. This was determined to be the case.The plane was flown gear down to our Maintenance base for troubleshooting. They put the aircraft on jacks and determined that it was a sticky switch on the left main gear that created the improper illumination of the steady red light.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	954882
Time
Date	201106
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	TBM 700/TBM 850
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Vectors
Flight Plan	None
Component
Aircraft Component	Landing Gear Indicating System
Person 1
Function	Captain Single Pilot
Qualification	Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 42 Flight Crew Total 11215 Flight Crew Type 982
Events
Anomaly	Aircraft Equipment Problem Critical

A TBM800 pilot received three green and one red light indications after extending the landing gear. A safe landing ensued and maintenance determined the red light was caused by a sticking gear unsafe switch on the left main gear.