A C441 pilot failed to receive a right main landing gear locked down (green) light prior to landing and was unable to verify the integrity of the landing gear warning system. Emergency declared prior to actual touchdown.

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Attributes
ACN	635352
Time
Date	200410
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mmu.airport
State Reference	NJ
Altitude	agl bound lower : 0 agl bound upper : 1813
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mmu.tower tracon : zzz.tracon
Operator	general aviation : corporate
Make Model Name	Conquest I/Conquest II
Operating Under FAR Part	Part 91
Flight Phase	descent : approach landing : roll
Route In Use	approach : traffic pattern
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 153 flight time total : 18627 flight time type : 64
ASRS Report	635352
Person 2
Affiliation	government other Other
Function	other personnel other personnel other
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : landing gear warning
Resolutory Action	controller : provided flight assist flight crew : declared emergency flight crew : landed in emergency condition
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

During approach to landing I received an indication that the right main landing gear was not down and locked (no green light). I recycled the gear and went through the emergency checklist to no avail. The landing was normal but I had fire emergency vehicles called as a precaution. I had the plane towed in rather than taxi in as I was still afraid of a possible gear collapse. A mechanic came and found the problem to be a defective bulb. I had just finished training at a commercial flight school, but bulb checking/changing was never mentioned. It should be added to the emergency gear unsafe checklist for this plane as it is something a pilot can correct. Although when I later did try to check for a faulty bulb I was unable to correctly replace the 3 bulb unit which didn't just slide back in but had to be cocked to click into place. It is simple to do once you are shown and should be made part of the training program.

Original NASA ASRS Text

Title: A C441 PLT FAILED TO RECEIVE A R MAIN LNDG GEAR LOCKED DOWN (GREEN) LIGHT PRIOR TO LNDG AND WAS UNABLE TO VERIFY THE INTEGRITY OF THE LNDG GEAR WARNING SYS. EMER DECLARED PRIOR TO ACTUAL TOUCHDOWN.

Narrative: DURING APCH TO LNDG I RECEIVED AN INDICATION THAT THE R MAIN LNDG GEAR WAS NOT DOWN AND LOCKED (NO GREEN LIGHT). I RECYCLED THE GEAR AND WENT THROUGH THE EMER CHKLIST TO NO AVAIL. THE LNDG WAS NORMAL BUT I HAD FIRE EMER VEHICLES CALLED AS A PRECAUTION. I HAD THE PLANE TOWED IN RATHER THAN TAXI IN AS I WAS STILL AFRAID OF A POSSIBLE GEAR COLLAPSE. A MECH CAME AND FOUND THE PROB TO BE A DEFECTIVE BULB. I HAD JUST FINISHED TRAINING AT A COMMERCIAL FLT SCHOOL, BUT BULB CHKING/CHANGING WAS NEVER MENTIONED. IT SHOULD BE ADDED TO THE EMER GEAR UNSAFE CHKLIST FOR THIS PLANE AS IT IS SOMETHING A PLT CAN CORRECT. ALTHOUGH WHEN I LATER DID TRY TO CHK FOR A FAULTY BULB I WAS UNABLE TO CORRECTLY REPLACE THE 3 BULB UNIT WHICH DIDN'T JUST SLIDE BACK IN BUT HAD TO BE COCKED TO CLICK INTO PLACE. IT IS SIMPLE TO DO ONCE YOU ARE SHOWN AND SHOULD BE MADE PART OF THE TRAINING PROGRAM.

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.