Instructor with spi has loss of aircraft control, exits runway.

Attributes
ACN	247124
Time
Date	199307
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sql
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : hwd
Operator	general aviation : instructional
Make Model Name	Small Aircraft, High Wing, 1 Eng, Fixed Gear
Flight Phase	landing other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	instruction : instructor
Qualification	pilot : cfi
Experience	flight time last 90 days : 80 flight time total : 450 flight time type : 380
ASRS Report	247124
Person 2
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : student
Events
Anomaly	other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After landing at san carlos airport with a reported wind of 360- 320 degrees at 8-12 KTS, my student stepped on the right rudder, causing the airplane to veer to the right, at the same time turning ailerons to the left. I immediately took the controls. At this time it was apparent that abrupt control inputs may cause a ground loop. I decided to continue through the grass on the right side of runway 30 and safely stop on the parallel taxiway. No damage to ground lights or signs, no damage to airplane. In the future, if this same scenario occurs, hopefully there will be sufficient time to keep airplane on runway.

Original NASA ASRS Text

Title: INSTRUCTOR WITH SPI HAS LOSS OF ACFT CTL, EXITS RWY.

Narrative: AFTER LNDG AT SAN CARLOS ARPT WITH A RPTED WIND OF 360- 320 DEGS AT 8-12 KTS, MY STUDENT STEPPED ON THE R RUDDER, CAUSING THE AIRPLANE TO VEER TO THE R, AT THE SAME TIME TURNING AILERONS TO THE L. I IMMEDIATELY TOOK THE CTLS. AT THIS TIME IT WAS APPARENT THAT ABRUPT CTL INPUTS MAY CAUSE A GND LOOP. I DECIDED TO CONTINUE THROUGH THE GRASS ON THE R SIDE OF RWY 30 AND SAFELY STOP ON THE PARALLEL TXWY. NO DAMAGE TO GND LIGHTS OR SIGNS, NO DAMAGE TO AIRPLANE. IN THE FUTURE, IF THIS SAME SCENARIO OCCURS, HOPEFULLY THERE WILL BE SUFFICIENT TIME TO KEEP AIRPLANE ON RWY.

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.