Embraer Phenom 100
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor
Flight Crew Last 90 Days 62; Flight Crew Total 2459; Flight Crew Type 822
Communication Breakdown; Troubleshooting
Aircraft Equipment Problem Less Severe; Ground Excursion Runway
General Maintenance Action
Aircraft; Incorrect / Not Installed / Unavailable Part
Upon landing; the aircraft departed the runway to the right. I was seated in the right seat. I was not the pilot flying; however; upon landing rollout I noticed the aircraft beginning to track toward the right side of the runway. I stated 'Left Rudder' and applied left rudder. The aircraft continued to track toward the right and the right main tire left the runway. No damage occurred.Upon exiting the aircraft; I noticed long tire marks from the point of touchdown to the spot where the aircraft stopped. This is unusual for our aircraft and any other Phenom 100 to my knowledge. I recalled the Brake Control Unit was updated at the last inspection just 2 weeks prior. We notified the manufacturer and they sent out a maintenance team to check the airplane.After the aircraft was checked out by maintenance; I performed a taxi check and noticed the tires were still leaving marks on the runway. I questioned Embraer about this and they stated the aircraft was performing as designed and it is a 'certified product'. I explained to them that this seemed unusual. After all checks were complete; I decided to land at ZZZ on their 12;000ft runway to check out the landing performance. Upon landing at ZZZ I noticed the brand new tire with 1 landing on it had chunking and chevron marks on the tire. I once again thought this was unusual. I decided to bring the aircraft to the service center to have them study and repair the brakes. Embraer stands by the newest brake controller; but I have my issues. So; I had Embraer put the previous model brake controller on the aircraft.While Embraer doesn't seem to have any issues with their controller; nor do they want to provide me any information about the landing from the CVDR (Cockpit Voice and Data Recorder) downloads; I do not trust the latest brake controller -7 and I believe it was a contributing factor to the aircraft departing the runway. Since that time; we put brake controller -6 on the airplane and the airplane no longer leaves marks on the runway and the tires seem to be recovering from the original wear marks.
The Reporter stated that the E50P aircraft has one brake controller that is part of the anti-skid system. The Reporter stated that; per procedure; the pilot applying the brakes must stay on the brakes and not release them allowing the auto-brake system to slow the aircraft. The Reporter stated that after a software update; (from -6 to -7); the aircraft continued to track to the right each time the brakes were applied. The Reporter also stated that after the owner insisted that the previous brake controller be installed; the aircraft did not have a tracking problem when the brakes were applied. The Reporter stated that this may have been an isolated incident; but can't be sure of that.
Embraer E50P pilot reported that the aircraft tracked to the right upon landing.