While taxiing student panics, freezes on rudder and leaves taxiway damaging aircraft.

Attributes
ACN	231117
Time
Date	199301
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : fdk
State Reference	MD
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	ground other : taxi
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 150 flight time total : 826 flight time type : 500
ASRS Report	231117
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : student
Experience	flight time last 90 days : 3 flight time total : 3 flight time type : 3
Events
Anomaly	other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

I was taxiing with a 3 hour student, he has had problems taxiing due to past experiences operating earth movers. In an earth mover when you step on the right pedal you turn left and vice-versa, the opposite control inputs of taxiing an small aircraft. We practiced slow turns on the taxiway. We began to come within 5 ft of the left side of the taxiway while steering left. He panicked and reverted back to his initial steering methods. He heavily applied left rudder while applying the brake and locked up his leg. In an effort to get away from the grass quickly he applied full throttle. I couldn't fight him on the rudder and realizing we were going off the hard surface taxiway I pulled the mixture. The left wheel settled into a hole and the nose came down with the propeller striking the dirt twice until it continued to free spin, stopping due to the mixture. The aircraft was then returned to the flight school.

Original NASA ASRS Text

Title: WHILE TAXIING STUDENT PANICS, FREEZES ON RUDDER AND LEAVES TXWY DAMAGING ACFT.

Narrative: I WAS TAXIING WITH A 3 HR STUDENT, HE HAS HAD PROBS TAXIING DUE TO PAST EXPERIENCES OPERATING EARTH MOVERS. IN AN EARTH MOVER WHEN YOU STEP ON THE R PEDAL YOU TURN L AND VICE-VERSA, THE OPPOSITE CTL INPUTS OF TAXIING AN SMA. WE PRACTICED SLOW TURNS ON THE TXWY. WE BEGAN TO COME WITHIN 5 FT OF THE L SIDE OF THE TXWY WHILE STEERING L. HE PANICKED AND REVERTED BACK TO HIS INITIAL STEERING METHODS. HE HEAVILY APPLIED L RUDDER WHILE APPLYING THE BRAKE AND LOCKED UP HIS LEG. IN AN EFFORT TO GET AWAY FROM THE GRASS QUICKLY HE APPLIED FULL THROTTLE. I COULDN'T FIGHT HIM ON THE RUDDER AND REALIZING WE WERE GOING OFF THE HARD SURFACE TXWY I PULLED THE MIXTURE. THE L WHEEL SETTLED INTO A HOLE AND THE NOSE CAME DOWN WITH THE PROP STRIKING THE DIRT TWICE UNTIL IT CONTINUED TO FREE SPIN, STOPPING DUE TO THE MIXTURE. THE ACFT WAS THEN RETURNED TO THE FLT SCHOOL.

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.