A socata tbm 700 on approach at 10000 ft on landing gear extension has 3 green and 1 red unsafe light. Landing successful after following operating procedures.

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Attributes
ACN	497727
Time
Date	200101
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : geg.airport
State Reference	WA
Altitude	msl single value : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : geg.tower
Operator	general aviation : personal
Make Model Name	TBM 700
Operating Under FAR Part	Part 91
Navigation In Use	other vortac
Flight Phase	descent : approach
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Experience	flight time last 90 days : 40 flight time total : 2400 flight time type : 150
ASRS Report	497727
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : gear unsafe light other flight crewa
Resolutory Action	flight crew : landed in emergency condition
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance Chart Or Publication
Primary Problem	Aircraft

Narrative:

I had a red gear unsafe warning light upon lowering the gear, in addition to 3 greens. I followed the poh procedures and was unable to resolve the red light condition. After a successful landing, I determined that the landing gear was down and locked, and I flew the airplane after a thorough preflight and after determining the plane was airworthy. Later, the mechanic was not able to replicate the problem after resetting the switch. The poh does not describe the reset button or its location. I recommend that the reset button and its location be included in the poh so a pilot can reset it in case of a temporary malfunction. Callback conversation with reporter revealed the following information: the reporter stated the only thing the technician did in the way of a fix was reset a button behind the instrument panel. The reporter said the poh does not have any information on this button and its function. The reporter stated the airplane was jacked and the gear swung with no faults found. The reporter said the technician contacted the manufacturer to determine the function of the reset button but the explanation was confusing.

Original NASA ASRS Text

Title: A SOCATA TBM 700 ON APCH AT 10000 FT ON LNDG GEAR EXTENSION HAS 3 GREEN AND 1 RED UNSAFE LIGHT. LNDG SUCCESSFUL AFTER FOLLOWING OPERATING PROCS.

Narrative: I HAD A RED GEAR UNSAFE WARNING LIGHT UPON LOWERING THE GEAR, IN ADDITION TO 3 GREENS. I FOLLOWED THE POH PROCS AND WAS UNABLE TO RESOLVE THE RED LIGHT CONDITION. AFTER A SUCCESSFUL LNDG, I DETERMINED THAT THE LNDG GEAR WAS DOWN AND LOCKED, AND I FLEW THE AIRPLANE AFTER A THOROUGH PREFLT AND AFTER DETERMINING THE PLANE WAS AIRWORTHY. LATER, THE MECH WAS NOT ABLE TO REPLICATE THE PROB AFTER RESETTING THE SWITCH. THE POH DOES NOT DESCRIBE THE RESET BUTTON OR ITS LOCATION. I RECOMMEND THAT THE RESET BUTTON AND ITS LOCATION BE INCLUDED IN THE POH SO A PLT CAN RESET IT IN CASE OF A TEMPORARY MALFUNCTION. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ONLY THING THE TECHNICIAN DID IN THE WAY OF A FIX WAS RESET A BUTTON BEHIND THE INST PANEL. THE RPTR SAID THE POH DOES NOT HAVE ANY INFO ON THIS BUTTON AND ITS FUNCTION. THE RPTR STATED THE AIRPLANE WAS JACKED AND THE GEAR SWUNG WITH NO FAULTS FOUND. THE RPTR SAID THE TECHNICIAN CONTACTED THE MANUFACTURER TO DETERMINE THE FUNCTION OF THE RESET BUTTON BUT THE EXPLANATION WAS CONFUSING.

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.