Skyhawk 172/Cutlass 172
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Commercial
Flight Crew Last 90 Days 100; Flight Crew Total 650; Flight Crew Type 550
Situational Awareness; Time Pressure
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Flight Crew Took Evasive Action
Human Factors
Departing a new airport on an IFR flight plan; we announced on CTAF that we were taxiing to a departure runway via the taxiway. We were under a time constraint from clearance delivery (short clearance void time) and were feeling rushed to get off the ground. The only runway at this airport is parallel with all taxiways. Seeing the taxiway location sign ahead; we mistakenly entered a runway while another light aircraft was departing from the other end. As we noticed the white centerline markings; the departing aircraft passed over us and we quickly exited the runway.
C172 instructor reported taxiing onto the runway at L35 while another aircraft was taking off from the opposite end. They quickly exited the runway.