Date: 201903
Local time of day: 1801-2400
Location: ZZZ.Airport, US
Flight conditions: VMC
Weather elements / visibility: Rain
Light: Night
Aircraft: A319
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Taxi
Airspace: Class B ZZZ
ATC / advisory: Ground ZZZ
Second aircraft: Bombardier/Canadair Undifferentiated or Other Model
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Flying
Reporter qualification: Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Human factors: Communication Breakdown; Situational Awareness; Distraction
Second reporter function: Captain; Pilot Flying
Anomaly: ATC Issue All Types; Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Flight Crew
When detected: Taxi
Result: Flight Crew Took Evasive Action
Contributing factors: Human Factors; Procedure; Weather
Primary problem: Human Factors

Narrative: Pushed back from gate and was instructed by ramp to proceed to spot and contact Ground. Called Ground and was given taxi instructions to [Runway] XXR via [taxi instructions]; cross Runway XY. After crossing Runway XY; we began running the before takeoff checklist. Approaching Taxiway X; the Captain saw a CRJ to our left southbound on [taxiway X] that wasn't giving way. He had to aggressively apply the brakes to stop the aircraft in time. Had he not applied the brakes; a collision would have occurred. We both were certain we had not been given instructions to give way to or follow the CRJ; nonetheless; I queried Ground Control to see if we had missed an instruction or were supposed to give way to the CRJ. The Controller replied that we had not been told to give way and that she thought the CRJ would have been further down the taxiway by the time we got to the intersection. Shortly after this; we got a call from the Number 1 Flight Attendant informing us that the Number 4 Flight Attendant had fallen during the hard braking. The Captain asked if she was okay or if we should return to the gate to which the Number 1 [Flight Attendant] replied that he would check on her status. When he called back; he said that she would be okay and she wanted to continue. We then departed and the remainder of the flight was uneventful. During the departure briefing; we had discussed potential threats including it was dark; starting to rain; and possible distractions from the new checklist. It turned out that the new checklist was in fact a distraction and caused more heads down time than normal; but it was not the cause of this event. It is possible that with more heads up time the Captain may have seen the traffic slightly sooner and not needed to brake quite as aggressively. The event occurred because the Ground Controller failed to instruct us to give way to the CRJ or vice versa and we failed to detect the conflict in time to brake in a normal manner. Contributing was the design of the new checklist which does result in more heads down time for the captain.In the future; I will encourage waiting to run the checklist until we are on a straight section of taxiway with no upcoming turns or intersections and stop if necessary; especially at night or in low visibility.


Second narrative: We were taxiing from spot to [Runway] XXR via [Taxiway]. We had been cleared to taxi full length. As we approached the intersection with [Atis]; another aircraft was on [taxiway]approaching [Taxiway]. The other aircraft stopped and asked Ground if he was supposed to follow us. ATC had not mentioned anything about either aircraft to either one of us. She said he was to follow us; and said she hadn't referenced us because she thought we were further down the taxiway. The Ground Controller then said 'my bad' or something similar. I'm not aware of any issues that resulted; and I'm not aware of any pilot deviations from either crew. Ground failed to instruct the other aircraft to yield to us.


Synopsis: Flight crew reported they had ground conflict with another airplane during taxi to runway.