Date: 201808
Local time of day: 0601-1200
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: Embraer Phenom 100
Operator: Corporate
Operating under: Part 91
Flight plan: IFR
Mission: Passenger
Flight phase: Landing
Airspace: Class G ZZZ
ATC / advisory: CTAF ZZZ
Aircraft component: Normal Brake System
Component problem: Malfunctioning
Reporter organization: Corporate
Reporter function: Single Pilot
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor
Human factors: Communication Breakdown; Troubleshooting
Anomaly: Aircraft Equipment Problem Less Severe; Ground Excursion Runway
Detector: Person Flight Crew
When detected: Taxi
Result: General Maintenance Action
Contributing factors: Aircraft; Incorrect / Not Installed / Unavailable Part
Primary problem: Incorrect / Not Installed / Unavailable Part

Narrative: 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.

Callback: 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.



Synopsis: Embraer E50P pilot reported that the aircraft tracked to the right upon landing.