Narrative:

As captain with a single pilot exemption type rating on the cessna citation ii CE550; I was giving instruction to [the] first officer (first officer) who is seeking a second-in-command type rating. [The] first officer has demonstrated to me from two prior flights that he is proficient with the flight characteristics of the citation ii with two successful takeoffs and landings to a full stop under my guidance and supervision. No passengers were on board for these training events. On our third landing [the] first officer executed a stabilized approach and landing as before. After touchdown on runway centerline; [the] first officer deployed the thrust reversers while I deployed the speed brakes and called six lights to verify thrust reverser activation. At slightly below 60 knots; I called for him to stow the thrust reversers and to apply wheel braking as normal. Shortly after he stowed the thrust reversers the aircraft gradually started to veer off centerline to the right. I told him to maintain centerline and he responded that he had full left rudder with the aircraft not correcting back to centerline. I immediately took control of the aircraft and stated that 'I have the airplane' which he responded 'you have the airplane'. This happened very quickly. I confirmed that the left rudder was fully depressed while applying braking on the left rudder but no correction happening. My initial thoughts was that we blew a right main tire. Our speed was decelerating below 20 knots about that time when the right main landing gear exited the runway pavement and onto the grass. We came to a full stop shortly after that. The runway length was 4;400 feet. The aircraft stopped just past the taxiway about three quarters of the runway remaining with the main wheel and the nose wheel in the grass. The right main landing gear remained on the runway. I performed the engine shutdown procedures and completed the checklist. After I secured the aircraft we exited the airplane to evaluate any damage and to call flight service to have the airport shut down with a NOTAM. The airport manager came and we towed the aircraft off the grass.once the airplane was on the ramp; I spent an hour inspecting the aircraft for any damage to determine if a ferry permit was needed for further inspection. No damage was found at that time so I made the decision to fly the plane back to where the airplane is based for further inspection. We secured a ferry permit just to be safe and I flew the plane to [another airport] where the aircraft was fully inspected by their maintenance facility. No damage was found and the aircraft was returned to service. No damage was found on the runway or airport lighting. No people or property were injured. The runway was dry and free of FOD upon landing. No tire deflation on landing. Thrust reversers were working as normal. Airspeed on landing was correct per checklist charts. I suspect that the student was riding the right brake and correcting with full left rudder and no left brake. I believe that the student may have been still riding the right brake when I took control of the airplane but I cannot confirm this because by the time I took control of the aircraft; it was too late as the right main landing gear went off the pavement and we came to a stop. The runway is 60 feet wide. I did not observe any flat spots on any of the main tires or any heavy skid marks on the runway. Another factor that may have contributed to this is that the student is 6'5' tall and may have played a factor. Adjusting the rudder pedals back further if possible would have helped prevent riding the brake in my opinion.

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Original NASA ASRS Text

Title: CE550 flight crew reported a runway excursion resulted when they lost directional control on the landing roll.

Narrative: As Captain with a single pilot exemption type rating on the Cessna Citation II CE550; I was giving instruction to [the] First officer (FO) who is seeking a Second-in-Command type rating. [The] FO has demonstrated to me from two prior flights that he is proficient with the flight characteristics of the Citation II with two successful takeoffs and landings to a full stop under my guidance and supervision. No passengers were on board for these training events. On our third landing [the] FO executed a stabilized approach and landing as before. After touchdown on runway centerline; [the] FO deployed the thrust reversers while I deployed the speed brakes and called six lights to verify thrust reverser activation. At slightly below 60 knots; I called for him to stow the thrust reversers and to apply wheel braking as normal. Shortly after he stowed the thrust reversers the aircraft gradually started to veer off centerline to the right. I told him to maintain centerline and he responded that he had full left rudder with the aircraft not correcting back to centerline. I immediately took control of the aircraft and stated that 'I have the airplane' which he responded 'you have the airplane'. This happened very quickly. I confirmed that the left rudder was fully depressed while applying braking on the left rudder but no correction happening. My initial thoughts was that we blew a right main tire. Our speed was decelerating below 20 knots about that time when the right main landing gear exited the runway pavement and onto the grass. We came to a full stop shortly after that. The runway length was 4;400 feet. The aircraft stopped just past the taxiway about three quarters of the runway remaining with the main wheel and the nose wheel in the grass. The right main landing gear remained on the runway. I performed the engine shutdown procedures and completed the checklist. After I secured the aircraft we exited the airplane to evaluate any damage and to call flight service to have the airport shut down with a NOTAM. The airport manager came and we towed the aircraft off the grass.Once the airplane was on the ramp; I spent an hour inspecting the aircraft for any damage to determine if a ferry permit was needed for further inspection. No damage was found at that time so I made the decision to fly the plane back to where the airplane is based for further inspection. We secured a ferry permit just to be safe and I flew the plane to [another airport] where the aircraft was fully inspected by their maintenance facility. No damage was found and the aircraft was returned to service. No damage was found on the runway or airport lighting. No people or property were injured. The runway was dry and free of FOD upon landing. No tire deflation on landing. Thrust reversers were working as normal. Airspeed on landing was correct per checklist charts. I suspect that the student was riding the right brake and correcting with full left rudder and no left brake. I believe that the student may have been still riding the right brake when I took control of the airplane but I cannot confirm this because by the time I took control of the aircraft; it was too late as the right main landing gear went off the pavement and we came to a stop. The runway is 60 feet wide. I did not observe any flat spots on any of the main tires or any heavy skid marks on the runway. Another factor that may have contributed to this is that the student is 6'5' tall and may have played a factor. Adjusting the rudder pedals back further if possible would have helped prevent riding the brake in my opinion.

Data retrieved from NASA's ASRS site 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.