Small aircraft makes hard landing, balloons and has landing gear collapsed on second landing.

Attributes
ACN	145895
Time
Date	199005
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : plb
State Reference	NY
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Flight Phase	landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 220 flight time total : 910 flight time type : 50
ASRS Report	145895
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : instrument pilot : private
Experience	flight time last 90 days : 90 flight time total : 245 flight time type : 18
ASRS Report	145973
Events
Anomaly	inflight encounter : weather other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control none taken : unable
Consequence	other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

My student and I were on a commercial lesson doing a short field landing. As we turned final we checked and the gear and flaps were down. Due to the turbulence the T/D was rough, so we ballooned and added power. The second T/D occurred approximately 1000' down the runway. The right gear was down and the left gear and nose gear had collapsed. We slid to a stop and exited the aircraft immediately. No injury to either occupant. Probable cause for the incident was due to the first hard landing. Either the impact jolted the gear or gear switch and the gear retracted or simply folded. Supplemental information from acn 145973: the right main gear was partially down and the left main and nose gear were folded up when we came to a stop. I believe the cause for the gear becoming unlocked in the down position is that on landing the first time the switch was jolted, or my knee possibly came in contact with the lever. The lever was still down after later inspection.

Original NASA ASRS Text

Title: SMA MAKES HARD LNDG, BALLOONS AND HAS LNDG GEAR COLLAPSED ON SECOND LNDG.

Narrative: MY STUDENT AND I WERE ON A COMMERCIAL LESSON DOING A SHORT FIELD LNDG. AS WE TURNED FINAL WE CHKED AND THE GEAR AND FLAPS WERE DOWN. DUE TO THE TURB THE T/D WAS ROUGH, SO WE BALLOONED AND ADDED PWR. THE SECOND T/D OCCURRED APPROX 1000' DOWN THE RWY. THE RIGHT GEAR WAS DOWN AND THE LEFT GEAR AND NOSE GEAR HAD COLLAPSED. WE SLID TO A STOP AND EXITED THE ACFT IMMEDIATELY. NO INJURY TO EITHER OCCUPANT. PROBABLE CAUSE FOR THE INCIDENT WAS DUE TO THE FIRST HARD LNDG. EITHER THE IMPACT JOLTED THE GEAR OR GEAR SWITCH AND THE GEAR RETRACTED OR SIMPLY FOLDED. SUPPLEMENTAL INFO FROM ACN 145973: THE RIGHT MAIN GEAR WAS PARTIALLY DOWN AND THE LEFT MAIN AND NOSE GEAR WERE FOLDED UP WHEN WE CAME TO A STOP. I BELIEVE THE CAUSE FOR THE GEAR BECOMING UNLOCKED IN THE DOWN POS IS THAT ON LNDG THE FIRST TIME THE SWITCH WAS JOLTED, OR MY KNEE POSSIBLY CAME IN CONTACT WITH THE LEVER. THE LEVER WAS STILL DOWN AFTER LATER INSPECTION.

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.