Date: 201809
Local time of day: 0601-1200
Location: ZZZ.Airport, US
Flight conditions: VMC
Weather elements / visibility: Fog; 10
Light: Dawn
Aircraft: PA-28 Cherokee/Archer/Dakota/Pillan/Warrior
Operator: FBO
Operating under: Part 91
Flight plan: None
Mission: Training
Flight phase: Taxi
Airspace: Class G ZZZ
ATC / advisory: CTAF ZZZ
Second aircraft: Citationjet (C525/C526) - CJ I / II / III / IV
Reporter organization: FBO
Reporter function: Instructor; Pilot Flying
Reporter qualification: Flight Crew Instrument; Flight Crew Flight Instructor; Flight Crew Multiengine
Human factors: Communication Breakdown
Second reporter function: Single Pilot
Anomaly: Conflict Ground Conflict; Critical; 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: I started my engine on the ramp at ZZZ taking my student to an Instrument checkride. The AWOS was inoperative but it was VFR conditions with fog present south of Runway XX extending to about 2;000 feet. down the runway. Runway XX1 was clear of fog so I chose to taxi from the ramp to Runway XX1 for departure.I made a radio call on the CTAF stating I was at the ramp taxing to XX1. I visually scanned the area and began to taxi. There was nobody else making radio calls on the CTAF at this time. In order to get to Runway XX1 I needed to cross Runway XX2/XX. I taxied up to the XX2/XX hold short line; held short and made another radio call stating I was crossing Runway XX2/XX. I looked both ways. Runway XX2 was clear and the Runway XX end was foggy. With no objection from any other traffic I began taxiing across. While about halfway across the runway I saw a landing light and nav lights appear to my right coming on us quickly. I immediately went full power and vacated the runway.A Cessna Citation had begun it's take off roll on Runway XX in the fog as I was crossing the runway on the clear side. He came blasting out of the fog at rotation speed and I just got off the runway in time to avoid a collision. The pilot of the Citation then said; 'Where were your radio calls?' To seemingly put the blame on me. I replied 'I've made all my position reports I didn't hear you say a word.' I think they were on the clearance frequency picking up and IFR clearance and didn't monitor CTAF. They began their take off roll without reporting it assuming the runway was clear.This was an extremely frightening experience that could have easily been avoided with proper nontowered airport radio communications. I personally think that it should be a requirement to monitor CTAF while picking up an IFR clearance or changing frequencies for any reason at a nontowered airport. And I think that there should be more strict take off minimums under Part 91.


Second narrative: I was flying a Cessna CJ2 departing on an IFR flight plan from Runway XX. I announced on CTAF that I was taking Runway XX for an IFR departure to the north. No radio calls were made by other aircraft before my taxi out and after my departure call. Just before midfield I noticed a flashing light to my left. It was the strobes of a PA28 on the Taxiway crossing my Runway at a very high rate of speed without any radio calls. I was past V1; so I was past the point of aborting my takeoff. I rotated early to avoid colliding with the crossing aircraft. I was able to watch the PA28 cross from my left; under my nose; and off to the right out my side window.After getting airborne I called the aircraft on CTAF to ask what they were doing and why they hadn't made any radio calls. He seemed startled and said his radio must not have been working. I do not know what was going on in his cockpit and if an instructor was onboard with the student or not. From my perspective it seemed like the pilot thought he could cross my runway before I reached him at midfield. I thought this because of his excessive rate of speed entering my runway while he taxied across. I monitored CTAF after departure for 15 minutes and the pilot never made another radio call after acknowledging me and that he almost cause a crash.


Synopsis: CJ2 and PA28 pilots reported runway incursion resulting in both aircraft taking evasive action.