Landing gear of an small aircraft sel collapsed during a training flight landing roll.

Attributes
ACN	301743
Time
Date	199504
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ilm
State Reference	NC
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	M-20 F Executive 21
Operating Under FAR Part	Part 91
Flight Phase	landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : private
Experience	flight time last 90 days : 3 flight time total : 271 flight time type : 4
ASRS Report	301743
Person 2
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : cfi pilot : commercial
Experience	flight time last 90 days : 14 flight time total : 2698 flight time type : 3
ASRS Report	301525
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	faa : investigated other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

While performing touch and goes in aircraft for insurance training requirements. I and my instructor experienced a landing gear collapse on the sixth landing -- left main collapsed just after touchdown followed by right main and nose gear -- gear was verified as down and locked on downwind and final leg of pattern by both pilot and instructor. Aircraft slid on belly for duration of landing. No injury to anyone, and damage limited to propeller-engine and belly area of aircraft was all that was noticed. Callback conversation with reporter revealed the following information: reporter stated that the FAA inspector investigating this incident observed the actual involuntary movement of the landing gear extension handle from the detent causing the gear to retract. The aircraft, mooney model 20 F, is designed to show the landing gear up or down position by the micro switches actuated by the landing gear extension handle. Therefore, it is important to assure that the handle is in the detent or locked position to assure gear position. This also means that the landing gear may not be fully locked down or up when the handle is in the detent and the 1 light green or 1 light red is lighted. The reporter further stated that the gear handle had to 'bounce out' of the detent on it's own since a last min check of the landing gear handle was made by both the reporter and the instructor.

Original NASA ASRS Text

Title: LNDG GEAR OF AN SMA SEL COLLAPSED DURING A TRAINING FLT LNDG ROLL.

Narrative: WHILE PERFORMING TOUCH AND GOES IN ACFT FOR INSURANCE TRAINING REQUIREMENTS. I AND MY INSTRUCTOR EXPERIENCED A LNDG GEAR COLLAPSE ON THE SIXTH LNDG -- L MAIN COLLAPSED JUST AFTER TOUCHDOWN FOLLOWED BY R MAIN AND NOSE GEAR -- GEAR WAS VERIFIED AS DOWN AND LOCKED ON DOWNWIND AND FINAL LEG OF PATTERN BY BOTH PLT AND INSTRUCTOR. ACFT SLID ON BELLY FOR DURATION OF LNDG. NO INJURY TO ANYONE, AND DAMAGE LIMITED TO PROP-ENG AND BELLY AREA OF ACFT WAS ALL THAT WAS NOTICED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE FAA INSPECTOR INVESTIGATING THIS INCIDENT OBSERVED THE ACTUAL INVOLUNTARY MOVEMENT OF THE LNDG GEAR EXTENSION HANDLE FROM THE DETENT CAUSING THE GEAR TO RETRACT. THE ACFT, MOONEY MODEL 20 F, IS DESIGNED TO SHOW THE LNDG GEAR UP OR DOWN POS BY THE MICRO SWITCHES ACTUATED BY THE LNDG GEAR EXTENSION HANDLE. THEREFORE, IT IS IMPORTANT TO ASSURE THAT THE HANDLE IS IN THE DETENT OR LOCKED POS TO ASSURE GEAR POS. THIS ALSO MEANS THAT THE LNDG GEAR MAY NOT BE FULLY LOCKED DOWN OR UP WHEN THE HANDLE IS IN THE DETENT AND THE 1 LIGHT GREEN OR 1 LIGHT RED IS LIGHTED. THE RPTR FURTHER STATED THAT THE GEAR HANDLE HAD TO 'BOUNCE OUT' OF THE DETENT ON IT'S OWN SINCE A LAST MIN CHK OF THE LNDG GEAR HANDLE WAS MADE BY BOTH THE RPTR AND THE INSTRUCTOR.

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.