AC11 instructor and trainee had landing gear collapse on landing.

Attributes
ACN	486098
Time
Date	200009
Day	Sat
Local Time Of Day	0601 To 1200
Place
State Reference	OH
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Weather Elements	Turbulence
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Aero Commander 112
Operating Under FAR Part	Part 91
Flight Phase	landing : roll
Flight Plan	VFR
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi pilot : multi engine
Experience	controller military : 30 controller non radar : 45 controller radar : 45 controller supervisory : 40 flight time last 90 days : 6 flight time total : 5000 flight time type : 10
ASRS Report	486098
Person 2
Affiliation	other
Function	instruction : trainee
Qualification	pilot : student
Events
Anomaly	aircraft equipment problem : critical inflight encounter : turbulence inflight encounter : weather other anomaly other
Independent Detector	other flight crewa other other : 2
Resolutory Action	none taken : anomaly accepted
Consequence	other other
Supplementary
Problem Areas	Aircraft Maintenance Human Performance
Primary Problem	Aircraft

Narrative:

As instructor pilot I was training the new owner during his first flight in this aircraft. We had accomplished 2 simulated traffic patterns away from the airport. I had him fly the aircraft to downwind at huron county (oh) airport. When I took over, placed the gear handle in the down position and observed 3 green. On short final we encountered strong turbulence. As we touched down smoothly, the gear collapsed and we slid to a stop. Due to the ht of the steps and their strength we did no damage to flaps or the underside of the plane. Nose gear doors were damaged and propeller curled back. This aircraft, I found out later, had a history of gear problems with one previous nose gear collapse. We exited the aircraft after securing battery and alternator switch, etc. No injuries. The landing gear and system should be completely rebuilt. Gear was swung and discrepancy could not be duplicated, however the warning bell does not sound with gear unsafe and throttle aft.

Original NASA ASRS Text

Title: AC11 INSTRUCTOR AND TRAINEE HAD LNDG GEAR COLLAPSE ON LNDG.

Narrative: AS INSTRUCTOR PLT I WAS TRAINING THE NEW OWNER DURING HIS FIRST FLT IN THIS ACFT. WE HAD ACCOMPLISHED 2 SIMULATED TFC PATTERNS AWAY FROM THE ARPT. I HAD HIM FLY THE ACFT TO DOWNWIND AT HURON COUNTY (OH) ARPT. WHEN I TOOK OVER, PLACED THE GEAR HANDLE IN THE DOWN POS AND OBSERVED 3 GREEN. ON SHORT FINAL WE ENCOUNTERED STRONG TURB. AS WE TOUCHED DOWN SMOOTHLY, THE GEAR COLLAPSED AND WE SLID TO A STOP. DUE TO THE HT OF THE STEPS AND THEIR STRENGTH WE DID NO DAMAGE TO FLAPS OR THE UNDERSIDE OF THE PLANE. NOSE GEAR DOORS WERE DAMAGED AND PROP CURLED BACK. THIS ACFT, I FOUND OUT LATER, HAD A HISTORY OF GEAR PROBS WITH ONE PREVIOUS NOSE GEAR COLLAPSE. WE EXITED THE ACFT AFTER SECURING BATTERY AND ALTERNATOR SWITCH, ETC. NO INJURIES. THE LNDG GEAR AND SYS SHOULD BE COMPLETELY REBUILT. GEAR WAS SWUNG AND DISCREPANCY COULD NOT BE DUPLICATED, HOWEVER THE WARNING BELL DOES NOT SOUND WITH GEAR UNSAFE AND THROTTLE AFT.

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.