Citationjet (C525/C526) - CJ I / II / III / IV
Air Traffic Control Fully Certified
Situational Awareness; Confusion
ATC Issue All Types; Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Air Traffic Control Issued New Clearance
Human Factors; Procedure
I was working Local Control. Ground was training. The developmental had less than 5 hours of experience. A C525 called to taxi. The developmental issued instructions for the aircraft to taxi to Runway 13R via Bravo; Whiskey; Lima. The instructor then asked the developmental where the aircraft was. The developmental stated that he did not know. The instructor and the developmental then engage in a discussion about the situation as the aircraft is approaching Runway 13L. The aircraft was located on the east side of the field. To taxi the way instructed would require the aircraft cross both active runways. I as the Local Controller observed the aircraft approaching Runway 13L and gave Ground Control authorization to cross Runway 13L. I observed the Ground Control instructor attempt to clarify the taxi clearance as the aircraft was crossing Runway 13L. I then observed the aircraft continue straight on Taxiway Bravo towards Runway 13R. I brought it to Ground Control's attention that the aircraft was not stopping and appeared to be continuing across Runway 13R. The instructor brought the situation to the pilot's attention. The aircraft came to a stop in the middle of Runway 13R without authorization from Local Control. I feel the instructor let the situation go to far. I feel had the instructor controlled first and taught second; this situation would have never happened. The phraseology used was non-standard and confused the pilot. The aircraft should have been issued a clarifying taxi clearance immediately; using standard phraseology.
Local Controller described an unauthorized runway crossing event during training on Ground Control; the reporter indicating the instructor was late in taking the position and used non-standard phraseology leading to the incursion.