Runway excursion in an L19 after loss of aircraft control.

Attributes
ACN	359880
Time
Date	199702
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : trm
State Reference	CA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	landing other
Flight Plan	None
Person 1
Affiliation	Other
Function	instruction : instructor oversight : pic
Qualification	pilot : cfi pilot : atp pilot : instrument
Experience	flight time last 90 days : 9 flight time total : 4550 flight time type : 494
ASRS Report	359880
Person 2
Affiliation	Other
Function	flight crew : single pilot instruction : trainee
Qualification	pilot : commercial pilot : instrument
Experience	flight time type : 1
Events
Anomaly	other anomaly other anomaly other other anomaly other other spatial deviation
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:

On fourth and final landing, student made good landing just right of centerline. Aircraft started drifting right. Student applied left rudder and left brake. Aircraft continued right drift and departed runway. After about 40 ft the ground became very soft and the main wheels sunk in a decelerated aircraft. It tipped up on its nose and hung for a moment and then toppled over on back. Minor damage to tail, left wingtip, 1 tip of propeller and engine cowling. No injuries to pilots. Suspected cause: a thermal or propeller wash from T28's that had landed ahead of us. They had already turned off some 3000 ft down runway before we were over the overrun. I had advised PF that we might have to go around unless we had sufficient spacing behind landing T28's. After they cleared the runway I told him we had sufficient spacing and told him to continue the approach. Inspection of runway shows left rubber marks from braking from just left of centerline slowly curving right for some 200+ ft. Right wheel braking marks start approximately 50 ft prior to exiting runway -- they were lighter and not as wide as those at the left. In the first sentence I said student pilot, but the PF has extensive flying experience and certificates. He owns and flies a T28C and a C421B. He has previous tail dragger time, but had not flown them in a long time and had never flown O-1's.

Original NASA ASRS Text

Title: RWY EXCURSION IN AN L19 AFTER LOSS OF ACFT CTL.

Narrative: ON FOURTH AND FINAL LNDG, STUDENT MADE GOOD LNDG JUST R OF CTRLINE. ACFT STARTED DRIFTING R. STUDENT APPLIED L RUDDER AND L BRAKE. ACFT CONTINUED R DRIFT AND DEPARTED RWY. AFTER ABOUT 40 FT THE GND BECAME VERY SOFT AND THE MAIN WHEELS SUNK IN A DECELERATED ACFT. IT TIPPED UP ON ITS NOSE AND HUNG FOR A MOMENT AND THEN TOPPLED OVER ON BACK. MINOR DAMAGE TO TAIL, L WINGTIP, 1 TIP OF PROP AND ENG COWLING. NO INJURIES TO PLTS. SUSPECTED CAUSE: A THERMAL OR PROP WASH FROM T28'S THAT HAD LANDED AHEAD OF US. THEY HAD ALREADY TURNED OFF SOME 3000 FT DOWN RWY BEFORE WE WERE OVER THE OVERRUN. I HAD ADVISED PF THAT WE MIGHT HAVE TO GO AROUND UNLESS WE HAD SUFFICIENT SPACING BEHIND LNDG T28'S. AFTER THEY CLRED THE RWY I TOLD HIM WE HAD SUFFICIENT SPACING AND TOLD HIM TO CONTINUE THE APCH. INSPECTION OF RWY SHOWS L RUBBER MARKS FROM BRAKING FROM JUST L OF CTRLINE SLOWLY CURVING R FOR SOME 200+ FT. R WHEEL BRAKING MARKS START APPROX 50 FT PRIOR TO EXITING RWY -- THEY WERE LIGHTER AND NOT AS WIDE AS THOSE AT THE L. IN THE FIRST SENTENCE I SAID STUDENT PLT, BUT THE PF HAS EXTENSIVE FLYING EXPERIENCE AND CERTIFICATES. HE OWNS AND FLIES A T28C AND A C421B. HE HAS PREVIOUS TAIL DRAGGER TIME, BUT HAD NOT FLOWN THEM IN A LONG TIME AND HAD NEVER FLOWN O-1'S.

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.