Aircraft equipment problem right main gear did not latch down.

Attributes
ACN	319604
Time
Date	199510
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bld
State Reference	NV
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : hpn
Operator	general aviation : personal
Make Model Name	Cessna 310/T310C
Operating Under FAR Part	Part 91
Flight Phase	landing : go around landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	other other : other pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 1200 flight time type : 120
ASRS Report	316604
Person 2
Affiliation	Other
Function	other personnel
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

I was performing normal pattern work on runway 09R at boulder city airport. I brought the landing gear down at midfield downwind abeam the numbers runway 09R. I simulated a failed engine. I proceeded to make a standard single engine pattern down to the runway. The aircraft had a solid green light for the gear and a normal full stop landing was to be accomplished. Upon landing, the throttles were brought back to idle and I had a normal touchdown. At that moment I felt the right side of the aircraft begin to fall to the ground. I added power and pulled back on the yoke to abort the landing before damage occurred. The aircraft lifted off and abruptly settled back down on the ground about 100 ft further down the runway and then lifted off again and climbed out. It is my belief that the right main collapsed at that time and no damage occurred. During the climb out, the green down light from the gear was intermittent which led me to believe the gear was not latched into place. I pulled out the emergency checklist and cranked gear down and the light became solid green. I then made a flyby for the unicom operator and they said the gear was locked down. I did not know what was wrong with the gear and decided to be safe about it and proceed back to north las vegas airport. The aircraft flew fine. I requested fire trucks just in case the gear did not hold upon landing. I landed the aircraft and shut it down and got out. We then inspected the airplane. I believe I handled the situation excellently and professionally.

Original NASA ASRS Text

Title: ACFT EQUIP PROB R MAIN GEAR DID NOT LATCH DOWN.

Narrative: I WAS PERFORMING NORMAL PATTERN WORK ON RWY 09R AT BOULDER CITY ARPT. I BROUGHT THE LNDG GEAR DOWN AT MIDFIELD DOWNWIND ABEAM THE NUMBERS RWY 09R. I SIMULATED A FAILED ENG. I PROCEEDED TO MAKE A STANDARD SINGLE ENG PATTERN DOWN TO THE RWY. THE ACFT HAD A SOLID GREEN LIGHT FOR THE GEAR AND A NORMAL FULL STOP LNDG WAS TO BE ACCOMPLISHED. UPON LNDG, THE THROTTLES WERE BROUGHT BACK TO IDLE AND I HAD A NORMAL TOUCHDOWN. AT THAT MOMENT I FELT THE R SIDE OF THE ACFT BEGIN TO FALL TO THE GND. I ADDED PWR AND PULLED BACK ON THE YOKE TO ABORT THE LNDG BEFORE DAMAGE OCCURRED. THE ACFT LIFTED OFF AND ABRUPTLY SETTLED BACK DOWN ON THE GND ABOUT 100 FT FURTHER DOWN THE RWY AND THEN LIFTED OFF AGAIN AND CLBED OUT. IT IS MY BELIEF THAT THE R MAIN COLLAPSED AT THAT TIME AND NO DAMAGE OCCURRED. DURING THE CLB OUT, THE GREEN DOWN LIGHT FROM THE GEAR WAS INTERMITTENT WHICH LED ME TO BELIEVE THE GEAR WAS NOT LATCHED INTO PLACE. I PULLED OUT THE EMER CHKLIST AND CRANKED GEAR DOWN AND THE LIGHT BECAME SOLID GREEN. I THEN MADE A FLYBY FOR THE UNICOM OPERATOR AND THEY SAID THE GEAR WAS LOCKED DOWN. I DID NOT KNOW WHAT WAS WRONG WITH THE GEAR AND DECIDED TO BE SAFE ABOUT IT AND PROCEED BACK TO N LAS VEGAS ARPT. THE ACFT FLEW FINE. I REQUESTED FIRE TRUCKS JUST IN CASE THE GEAR DID NOT HOLD UPON LNDG. I LANDED THE ACFT AND SHUT IT DOWN AND GOT OUT. WE THEN INSPECTED THE AIRPLANE. I BELIEVE I HANDLED THE SIT EXCELLENTLY AND PROFESSIONALLY.

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.