C170 instructor went off runway while demonstrating a wheel landing.

Attributes
ACN	450649
Time
Date	199910
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : 3wi9.airport
State Reference	WI
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Cessna 170
Operating Under FAR Part	Part 91
Flight Phase	landing : roll
Route In Use	approach : visual
Flight Plan	None
Person 1
Affiliation	other
Function	flight crew : single pilot instruction : instructor
Qualification	pilot : commercial pilot : cfi
Experience	flight time last 90 days : 15 flight time total : 2200 flight time type : 50
ASRS Report	450649
Person 2
Affiliation	other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : student
Events
Anomaly	conflict : ground critical excursion : runway ground encounters other non adherence : far non adherence : published procedure other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : insufficient time
Consequence	other other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

I, as the CFI, was demonstrating a 'wheel landing' to a student who just purchased the C170. During the landing roll, control was lost and the aircraft left the grass runway, struck a rough piece of terrain, went up on nose slightly and struck the propeller and cowling. Apparent damage to propeller, cowling and wheel pants. The only correction or change that I am unsure of is it felt to me as if the left rudder stuck or my foot caught something on the side of the housing and prevented my pushing the rudder to the left. The student and I both had exchanged information and I was flying the demonstration. Looking at skid marks, I now think the student was on the brakes with me. The other thing I noticed is an angle bracket that controls the heater sticks out about 1/2 inch and maybe my foot caught that.

Original NASA ASRS Text

Title: C170 INSTRUCTOR WENT OFF RWY WHILE DEMONSTRATING A WHEEL LNDG.

Narrative: I, AS THE CFI, WAS DEMONSTRATING A 'WHEEL LNDG' TO A STUDENT WHO JUST PURCHASED THE C170. DURING THE LNDG ROLL, CTL WAS LOST AND THE ACFT LEFT THE GRASS RWY, STRUCK A ROUGH PIECE OF TERRAIN, WENT UP ON NOSE SLIGHTLY AND STRUCK THE PROP AND COWLING. APPARENT DAMAGE TO PROP, COWLING AND WHEEL PANTS. THE ONLY CORRECTION OR CHANGE THAT I AM UNSURE OF IS IT FELT TO ME AS IF THE L RUDDER STUCK OR MY FOOT CAUGHT SOMETHING ON THE SIDE OF THE HOUSING AND PREVENTED MY PUSHING THE RUDDER TO THE L. THE STUDENT AND I BOTH HAD EXCHANGED INFO AND I WAS FLYING THE DEMONSTRATION. LOOKING AT SKID MARKS, I NOW THINK THE STUDENT WAS ON THE BRAKES WITH ME. THE OTHER THING I NOTICED IS AN ANGLE BRACKET THAT CTLS THE HEATER STICKS OUT ABOUT 1/2 INCH AND MAYBE MY FOOT CAUGHT THAT.

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.