Premier 1
Air Traffic Control Fully Certified
Communication Breakdown; Situational Awareness; Confusion
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
General None Reported / Taken
Aircraft; Human Factors
North flow with Runway 22 active. All Runways in use makes operations complex because traffic is departing; landing and taxiing to/from all quadrants of airport. Aircraft Z just landed Runway 30L; I scanned Runway 22; [and] then cleared Aircraft X for departure off of Runway 22. I line up Aircraft W on Runway 22 and clear Runway 30L when Supervisor yells; 'what are you doing; you have someone crossing down here!' I look and see Aircraft Y cross the departure end of Runway 22 on Taxiway GOLF. My departure is beyond the safe point to cancel takeoff. The ASDE alarms. Aircraft Y was instructed to taxi to Runway 35 at G3 intersection for departure. This runway intersects Runway 22; but G3 is North of Runway 22 and Aircraft Y was not cleared; nor should he have crossed Runway 22. Aircraft Y read back the clearance to taxi to Runway 35 at G3. I am not sure of what to suggest. This was a pilot deviation. Ground and Local controllers scanned the runways; and the pilot read back the correct clearance. Because of the complexity of the traffic flow on this landing and departing configuration; extra caution is always taken when taxiing aircraft to and from the runways. Ground Control assigned the correct runway; and the aircraft read back the correct clearance. Ground observed the aircraft taxiing to the correct runway and Local Control scanned the departure runway and saw that it was clear before departing Aircraft X.
A HOU runway conflict occurred when a taxiing aircraft crossed an active runway without clearance.