Date: 202108
Local time of day: 1801-2400
Location: ZZZ.Airport, US
Flight conditions: VMC
Weather elements / visibility: Haze / Smoke; 10
Light: Daylight
Aircraft: SR22
Operator: Personal
Operating under: Part 91
Flight plan: IFR
Mission: Personal
Flight phase: Takeoff / Launch
ATC / advisory: CTAF ZZZ
Second aircraft: Small Transport; Low Wing; 2 Turbojet Eng
Reporter organization: Personal
Reporter function: Pilot Flying; Single Pilot
Reporter qualification: Flight Crew Instrument; Flight Crew Private
Human factors: Human-Machine Interface; Distraction; Communication Breakdown; Situational Awareness; Time Pressure
Anomaly: Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Detector: Person Flight Crew
When detected: Taxi
Result: Flight Crew Took Evasive Action
Contributing factors: Human Factors; Procedure
Primary problem: Human Factors

Narrative: ZZZ; taxied from FBO to runway XX (announced movements on CTAF). Holding short of runway XX; switched to Center frequency. Third leg of the day; from ZZZ1 to ZZZ2 (via ZZZ3; ZZZ). Called Center to pick up IFR clearance. Center told me to standby. No word back after 3-4 min; so I called Center again. Once again told to standby. OAT was around 97 degrees; engine idling and oil temps starting to climb (a distraction/concern). Center finally called back (around 8-9 min from initial call) and gave a quick clearance - as filed; code; released and call again airborne. I read back the clearance. Typical chain of events; with hot weather; delays getting clearance; idling for a long time at the runway... So once released I taxied across the hold short line without calling again on CTAF. I checked final; and then the runway and noticed another plane on the runway at the other end (business jet; lights on).  I immediately did a 180 and exited the runway - the plane at the other end was apparently already on the roll and departed well above us. Runway is 5;950 ft; so we were never very close...but clearly could have been a problem had I continued my takeoff roll.When I was on with Center; I was not simultaneously monitoring the CTAF frequency - so I never heard the other plane announce their departure. I also didn't switch back to CTAF and announce after being released so they didn't have any indication I was taking the runway. I should have been monitoring CTAF the entire time; and of course announced my intentions before moving.Factors include: multiple delays reaching Center; rising engine temps and concern about timing with Center; last of three long legs that day (one leg with weather over the Rockies); single-pilot (one non-pilot passenger); and probably allowing communications with Center to feel like a tower situation (release treated as takeoff clearance). Winds light. We had landed runway XX on the way in (as had other planes) - so wasn't expecting a plane to depart from the other end (but probably fit their direction of flight).Probably wouldn't have happened if I had departed VFR and picked up clearance in the air (stayed on CTAF on the ground); but I knew Center was reachable on the ground and figured I should just get clearance first. Should have monitored CTAF at the same time for situational awareness.




Synopsis: Pilot reported taxiing onto the active runway without announcing their intentions on CTAF and observed a business jet on takeoff roll. The Pilot immediately exited the runway; with the jet passing overhead; well above.