PA-30 Twin Comanche
Flight Crew Private; Flight Crew Instrument
Flight Crew Last 90 Days 28; Flight Crew Total 245; Flight Crew Type 29
Training / Qualification; Situational Awareness
Ground Event / Encounter Ground Strike - Aircraft; Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Runway
Aircraft Aircraft Damaged; Flight Crew Regained Aircraft Control; General Maintenance Action
Weather; Human Factors
Upon landing on runway aircraft yawed abruptly to the left; pilot overcorrected causing several oscillations till aircraft turned 90 degrees perpendicular to runway. Aircraft then went into grass to right of runway. Instructor took over and taxied to ramp. No one was hurt; but a propeller will have to be replaced. There was no apparent reason for the aircraft to yaw in such a manner to start the incident; landing was smooth and ideal. Minimal Crosswind and runway was clear; however snow was on the ground. Aircraft type has had similar incidents with other pilots.
I was instructing an advanced student on multi engine operations. This student had 10+ hours in type and was flying the aircraft well. The student's approach was excellent; right on glide path and speed; touchdown was normal and I relaxed as we were initially rolling out normally then the aircraft yawed right and the student over corrected left then back right at which time I took the aircraft. As the initial yaw and corrections took place there was a feeling as if the aircraft was on ice although the runway was bare and dry. As I took control it felt as if the tires were able to bite the runway and this accelerated our movement towards the right edge and I was unable to prevent an exit. I steered the aircraft back onto the runway and taxied to a parking spot. Inspection of the aircraft revealed that a Foreign Object Damage (FOD) damaged prop was the only aircraft damage.I can't account for this as I have only seen this once before and that was precipitated by too much speed on touchdown. The wind was reported as 230/09 with no gusts and we were landing on 19 possibly a gust before we had gotten all the weight on the wheels set off the event.In the future as the instructor I will remain vigilant throughout the landing roll; the old adage 'the flight isn't over until you set the brakes' applies here.
A light twin pilot and flight instructor reported a loss of control during landing that resulted in a runway excursion and damage to one propeller.