Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 1.3
Communication Breakdown
Conflict NMAC; Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Air Traffic Control Separated Traffic; Flight Crew Took Evasive Action
Procedure; Human Factors; Aircraft
Aircraft X had requested an opposite direction departure during pushback. When they called for taxi the opposite direction was denied and full route taxi instructions were issued to the active; Runway 10R. The taxi route crossed a closed runway and the active runway prior to getting to the active runway at departure end. Correct taxi instructions were given. The pilot read back; 'Taxi via ... cross Runway 10L to Runway 10R'. I believed I heard 'cross Runway 10L; hold short 10R'.As Aircraft X was crossing Runway 10L the Local Controller was clearing Aircraft Y for takeoff on Runway 10R. As Aircraft Y was starting takeoff roll I observed Aircraft X cross the hold short line for Runway 10R and instructed them to hold short of Runway 10R. I alerted local to Aircraft X incursion and returned my attention to Aircraft X. The pilots of Aircraft X began breaking and turned to the west about 60 degrees to avoid crossing the runway edge line of Runway 10R.Aircraft Y was airborne and passed approximately 50 FT horizontally and vertically from Aircraft X.I then coordinated and crossed Aircraft X and issued the Brasher statement.Although it is proper (and 7110.65 recommended) phraseology; and the FAR's specifically prohibit a pilot from crossing any portion of the assigned runway without a crossing clearance; in the future I will not issue full taxi instructions to aircraft required to hold short of the active runway somewhere along their route. I will only issue instructions up the hold short point.
BOI Ground Controller reports of a near collision that happened with a passenger aircraft that had a runway incursion and an aircraft that was departing the airport.