LJ35 crew had the left main gear indicate it was not down and locked.

Attributes
ACN	605679
Time
Date	200401
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Environment
Flight Conditions	IMC
Weather Elements	Fog
Light	Night
Aircraft 1
Controlling Facilities	tower : zzz.tower
Operator	common carrier : air taxi
Make Model Name	Learjet 35
Operating Under FAR Part	Part 135
Flight Phase	descent : approach landing : go around
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine pilot : instrument pilot : commercial
Experience	flight time last 90 days : 100 flight time total : 12800 flight time type : 800
ASRS Report	605679
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : cfi pilot : instrument pilot : commercial
Experience	flight time last 90 days : 100 flight time total : 8200 flight time type : 250
ASRS Report	605678
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : lt main gear green light not on other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : executed go around flight crew : declared emergency flight crew : landed in emergency condition other
Consequence	other
Supplementary
Problem Areas	Aircraft Airport
Primary Problem	Aircraft

Narrative:

Upon final approach to ZZZ, the gear was selected down and the l-hand side did not indicate down. We went missed approach, troubleshot the gear, and did the emergency extension procedure, but still did not show the l-hand gear down. We declared an emergency, briefed our passenger, and flew the ILS to runway 6L. The landing was uneventful, but we elected to have the aircraft towed to the hangar. We had taken off ZZZ1, approximately 2 hours previous and the runway there was very soft, probably causing mud and slush to give us the erroneous indication. Supplemental information from acn 605678: the emergency gear extension procedures for the lear 35A model were performed to no avail. The left main gear light still did not illuminate. Said gear lights were tested in the test mode to verify that said bulb was not burnt out.

Original NASA ASRS Text

Title: LJ35 CREW HAD THE L MAIN GEAR INDICATE IT WAS NOT DOWN AND LOCKED.

Narrative: UPON FINAL APCH TO ZZZ, THE GEAR WAS SELECTED DOWN AND THE L-HAND SIDE DID NOT INDICATE DOWN. WE WENT MISSED APCH, TROUBLESHOT THE GEAR, AND DID THE EMER EXTENSION PROC, BUT STILL DID NOT SHOW THE L-HAND GEAR DOWN. WE DECLARED AN EMER, BRIEFED OUR PAX, AND FLEW THE ILS TO RWY 6L. THE LNDG WAS UNEVENTFUL, BUT WE ELECTED TO HAVE THE ACFT TOWED TO THE HANGAR. WE HAD TAKEN OFF ZZZ1, APPROX 2 HRS PREVIOUS AND THE RWY THERE WAS VERY SOFT, PROBABLY CAUSING MUD AND SLUSH TO GIVE US THE ERRONEOUS INDICATION. SUPPLEMENTAL INFO FROM ACN 605678: THE EMER GEAR EXTENSION PROCS FOR THE LEAR 35A MODEL WERE PERFORMED TO NO AVAIL. THE L MAIN GEAR LIGHT STILL DID NOT ILLUMINATE. SAID GEAR LIGHTS WERE TESTED IN THE TEST MODE TO VERIFY THAT SAID BULB WAS NOT BURNT OUT.

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.