Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 40; Flight Crew Total 16000; Flight Crew Type 150
Communication Breakdown
Conflict Ground Conflict; Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Airport; Procedure
Taxi for takeoff at uncontrolled field with fire tanker operations. Airport has runways that cross / originate at the end. RWY 20/24.  Landing Runway 06. The fire tanker reported the right base to RWY 06.  While we were taxing out. This put us in the position of blocking his exit from the runway and path to the fire tanker base.  We called to announce we were crossing the combined ends of the runway to taxi to Runway 06.  From the angle of the taxiway we looked to clear both runways of traffic; we could not see the air tanker until we started to cross the departure end of RWY 06. The tanker did not call his turn to final or short final to RWY 06. Once we started onto the runway and saw the tanker had touched down and was slowing we continued across to clear the runway and exit for the tanker.  The tanker was already slowing down and we had plenty of clearance to cross safely.  Had the tanker announced the turn to final we would have held short of the tanker base and waited to taxi.  Uncontrolled airports; announce; announce; announce to help de-conflict traffic.  When heavy tanker operations are in progress it would be prudent to have a local pilot man the unicorm to help de-conflict traffic; especially taxi traffic when there is a situation like COE where local traffic may impact tanker operations and cause a traffic jam. Had we not moved and the tanker had exited the runway there would have been the need to bring out a tug to back up one of the aircraft.
Medium transport Captain reported air tanker failing to make appropriate traffic pattern calls; resulted in a runway incursion.