Date: 201701
Local time of day: 0001-0600
Location: ZZZ.Airport, US
Flight conditions: IMC
Light: Night
Aircraft: EMB ERJ 145 ER/LR
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Landing
Airspace: Class C ZZZ
ATC / advisory: TRACON ZZZ; Tower ZZZ
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Flying
Reporter qualification: Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Human factors: Communication Breakdown; Workload
Second reporter function: Captain; Pilot Not Flying
Anomaly: ATC Issue All Types; Ground Event / Encounter Loss Of Aircraft Control; Ground Excursion Runway; Inflight Event / Encounter Weather / Turbulence
Detector: Person Flight Crew
Result: Flight Crew Took Evasive Action; General Maintenance Action
Contributing factors: Airport; Procedure; Weather
Primary problem: Weather

Narrative: On arrival into ZZZ; Center informed us that the airport operations was currently in the process of sweeping the runway and would be done by the time we arrived. We were given a Field Condition report by the dispatcher of 3/3/3 that was on 20 minutes old at the time of receipt. The Captain (CA) was monitoring CTAF and heard the trucks report they were clear of the runway shortly before we arrived. On landing we discovered that the braking report of 3/3/3 was inaccurate and braking was nil. I attempted to use brakes along with thrust reverses but could feel the wheels were sliding. Soon the nose started to depart the center line as we were trying slow the airplane. The CA took over the controls in an effort to try to get us back to center line but the plane kept on its course towards the edge of the runway. As we approached the edge the aircraft finally started to turn back to the right but the airplanes momentum carried it into the grass. We departed the runway approximately 6500 feet down the runway to the left side going into the grass about 30 feet at an angle.Threats included the deteriorating weather conditions that was occurring. We were monitoring a potential overweight landing situation. The braking report we were given was already almost 30 minutes old by the time we received it. The airplane sliding on the snow was the undesired aircraft state that we were trying to overcome.In looking back I feel the captain and I did everything we could have. I had briefed that I was going to use maximum thrust reverse to assist in slowing the aircraft in case the runway was slippery. We were going off a braking report of 3/3/3 that we felt was still accurate. Center had advised us the trucks were on the runway clearing the snow and they would be off by the time we got there. The CA heard the trucks report on the CTAF they were clear of the runway so we felt that it would be cleared better than it was. When we landed and realized the braking was nil and the plane started to depart center line the CA took controls and tried to do everything he could to get the airplane to return to center line and stop before we went into the grass.


Second narrative: Approaching ZZZ we had a weather report of 1 1/4 vis with light snow and mist; a 8 kt crosswind; and a ceiling of 1500'. The pilot flying was the First Officer (FO) and I was monitoring. The tower at ZZZ had just closed a few minutes prior and Center advised us trucks were on the runway sweeping it. I heard on CTAF the trucks report clear of the runway; I made a position report on CTAF but received no reply. Center then cleared us for the approach and switched us to CTAF. Just prior to starting the approach we received a message from dispatch; ZZZ reporting runway 4 FICON 3/3/3; 100% 1/2 inch wet snow; liquid deiced 50 feet wide. We flew the full approach and upon landing; the aircraft nose started turning left and the aircraft started drifting to the left. I saw the FO trying to correct for it with no success so I took the controls. I used right rudder; right brake; and right thrust reverse but the aircraft still proceeded to the left. I released right brake; and shortly after the nose slowly started coming back to the right although the aircraft still was drifting left. During this time the aircraft; although I still could not feel any braking action; was slowly decelerating and appeared to slowly decreasing its leftward drift. Just as I thought we might avoid going off the edge of the runway; it felt as the left main gear caught the grass and then pulled the aircraft to the left; off the runway and into the grass.The threats included the weather; the runway condition; the tower having closed; watching an overweight landing situation (which we landed under); task saturation as pilot monitoring including running procedures; monitoring weather and CTAF.The undesired aircraft state of the airplane losing braking effectiveness and direction control on the landing rollout and departing the runway into the grass.


Synopsis: EMB-145 Flight crew reported receiving a bad braking action report; and upon touchdown had trouble controlling the aircraft and ended up sliding off the left side of the runway.