During biennial flight review, GA aircraft ground-loops off runway.

Attributes
ACN	142303
Time
Date	199004
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : lot
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air taxi
Make Model Name	Small Aircraft, High Wing, 1 Eng, Retractable Gear
Flight Phase	landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 125 flight time total : 2080 flight time type : 37
ASRS Report	142303
Person 2
Affiliation	Other
Function	instruction : trainee
Qualification	pilot : private
Experience	flight time last 90 days : 5 flight time total : 574 flight time type : 4
ASRS Report	142704
Events
Anomaly	other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other other
Supplementary
Primary Problem	Ambiguous
Air Traffic Incident	other

Narrative:

I was finishing the conduct of a BFR with a student at lot. Student was making a final landing after making a good landing at the dupage airport. The approach was good and the aircraft was lined up with the centerline of the runway during the T/D and the ground roll when the aircraft began veering to the left. Student seemed to be applying the correct rudder action slowly, but the aircraft continued veering to the left. I immediately pushed the right rudder and started to right brake pressure. The aircraft kept veering to the left. I was apprehensive about applying more brake because I felt that if the brake locked up we would be in a worse condition. In spite of my efforts, the left main gear went off the runway into soft mud, immediately turning the aircraft erratically left. This left movement pulled the nose gear down into the mud causing the aircraft to FLIP over onto its back. There were no injuries caused by the incident, but the student cut and bruised his head when he released his seat belt. Supplemental information from acn 142704: runway lights were on and working. Wind was calm, temperature near 40 degrees F, visibility excellent. Runway shoulder was an abrupt transition to very soft, wet mud. I believe that once the left main wheel was in the mud, it was no longer possible to bring the aircraft back on the runway. I believe the tired was several inches below the edge of the pavement.

Original NASA ASRS Text

Title: DURING BIENNIAL FLT REVIEW, GA ACFT GND-LOOPS OFF RWY.

Narrative: I WAS FINISHING THE CONDUCT OF A BFR WITH A STUDENT AT LOT. STUDENT WAS MAKING A FINAL LNDG AFTER MAKING A GOOD LNDG AT THE DUPAGE ARPT. THE APCH WAS GOOD AND THE ACFT WAS LINED UP WITH THE CENTERLINE OF THE RWY DURING THE T/D AND THE GND ROLL WHEN THE ACFT BEGAN VEERING TO THE LEFT. STUDENT SEEMED TO BE APPLYING THE CORRECT RUDDER ACTION SLOWLY, BUT THE ACFT CONTINUED VEERING TO THE LEFT. I IMMEDIATELY PUSHED THE RIGHT RUDDER AND STARTED TO RIGHT BRAKE PRESSURE. THE ACFT KEPT VEERING TO THE LEFT. I WAS APPREHENSIVE ABOUT APPLYING MORE BRAKE BECAUSE I FELT THAT IF THE BRAKE LOCKED UP WE WOULD BE IN A WORSE CONDITION. IN SPITE OF MY EFFORTS, THE LEFT MAIN GEAR WENT OFF THE RWY INTO SOFT MUD, IMMEDIATELY TURNING THE ACFT ERRATICALLY LEFT. THIS LEFT MOVEMENT PULLED THE NOSE GEAR DOWN INTO THE MUD CAUSING THE ACFT TO FLIP OVER ONTO ITS BACK. THERE WERE NO INJURIES CAUSED BY THE INCIDENT, BUT THE STUDENT CUT AND BRUISED HIS HEAD WHEN HE RELEASED HIS SEAT BELT. SUPPLEMENTAL INFO FROM ACN 142704: RWY LIGHTS WERE ON AND WORKING. WIND WAS CALM, TEMP NEAR 40 DEGS F, VISIBILITY EXCELLENT. RWY SHOULDER WAS AN ABRUPT TRANSITION TO VERY SOFT, WET MUD. I BELIEVE THAT ONCE THE LEFT MAIN WHEEL WAS IN THE MUD, IT WAS NO LONGER POSSIBLE TO BRING THE ACFT BACK ON THE RWY. I BELIEVE THE TIRED WAS SEVERAL INCHES BELOW THE EDGE OF THE PAVEMENT.

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.