Date: 201809
Local time of day: 1801-2400
Location: ZZZ.Airport, US
Weather elements / visibility: Rain; 2
Light: Daylight
Aircraft: Embraer Phenom 100
Operator: Corporate
Operating under: Part 91
Flight plan: IFR
Mission: Passenger
Flight phase: Landing
ATC / advisory: Tower ZZZ
Aircraft component: Normal Brake System
Component problem: Failed
Reporter organization: Corporate
Reporter function: Pilot Flying; Single Pilot
Reporter qualification: Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Human factors: Situational Awareness
Anomaly: Aircraft Equipment Problem Less Severe; Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Runway
Detector: Person Flight Crew
When detected: Taxi
Result: Aircraft Aircraft Damaged; Flight Crew Took Evasive Action
Contributing factors: Aircraft; Weather
Primary problem: Aircraft

Narrative: Upon landing and applying brakes it seemed like nothing was happening; which is; initially; NOT unusual in a Phenom 100. The runway was wet at the time of the landing and from experience I knew that it would take longer than on a dry surface or to feel the brakes actually working. After an appreciable amount of time waiting for the electric braking cycle to work; I concluded they were not working and began slowly operating the emergency brake system. It became clear to me shortly after initiating; that I did not have enough runway left so at this point I focused on choosing the best departure path from the runway to avoid the runway end lights and the lights beyond. I did not lose directional control of the aircraft at any time and it came to a stop in the grass beyond the paved surface--estimated by an emergency responder to be 500 feet. I checked with the 2 passengers and made sure there were no injuries. There were none and they were buckled in. The field was uncontrolled at the time and I had been vectored to the approach by Approach Control. I then cancelled my flight plan on the radio with them and apprised them of the situation. The overrun was certainly unintentional and I hate the circumstance of it as one could only imagine. Clearly in my mind I had no brakes and in the immediate aftermath was certain that there was a problem with the brakes that was outside of the usual quirkiness that has been part of the history of this braking system. It was a scary few seconds; that I can tell you. However; investigators reviewing my statement after the event seem certain that I actually lost anti-skid during the landing which left me with 'manual braking' and that this was to be expected and pre-planned; and thus not result in an over-run based on the correct performance numbers and perfect pilot performance. It is obvious that I failed in that and I apologize for all of the inconvenience this event has caused. In conclusion; I am not in any way trying to throw the blame somewhere else; if in the fact the data indicates all of these circumstances were pilot error. The one thing that seems glaring to me in this situation if it is: If I am to get on the brakes and wait for something to happen on a wet runway--1) how long do I wait before going to plan b? 2) assuming anti-skid CAS happens at the instant it becomes unavailable: Was it working at all during the time it was trying and is that penalty built in to the runway distance required? 3) are we certain that if an element of the normal brake system fails; the CAS message is instantaneous? I say that because some switches I flip do not instantaneously display. And I conclude with--that is a lot of things happening cruising down a runway with no brakes--trying; trying; trying. From a human performance consideration as requested by this form: There were no factors affecting my performance that I am aware of. I did voluntarily find a drug testing facility within a couple of hours of the event just to document that claim if it ever came up.

Callback: The reporter stated that the incident is still under investigation. The reporter stated that after the incident the surface of the runway failed an inspection; presently the runway is being resurfaced. The reporter stated that the data from the FDR indicated that it was as if the aircraft was sliding on black ice. The reporter stated that the data also indicated that a RH transducer failed one second prior of pulling the emergency brake handle; which may have caused the anti-skid to fail; which caused the tires to blow out. The reporter also stated the brake control units on these aircraft have a history of malfunctioning. The BCU was removed and is being looked at.



Synopsis: An EMB500 Pilot reported that upon landing and applying the brakes it seemed like nothing happened.