Narrative:

At the time of the incident I was working ground and controller in charge (controller in charge) combined and [name removed] was working local control. Runway 26R was closed so we're were operating with a single runway; runway 26L. Local had citation rolling out 26L and [a] cherokee cleared for the option 26L. The citation slowed down to exit taxiway Q but instead local instructed the citation to turn left at taxiway P. At this time the cherokee was already within a half mile of the threshold but local never scanned to locate both aircraft. When local told the cherokee to turn at P; I immediately informed him of both aircraft positions and he ignored me. The citation was taxiing slowly down the runway and was still on the runway when the cherokee crossed the threshold and an altitude unknown. However before the incursion happened I instructed local to send the cherokee around twice and he disregarded my instructions. The second time I told him to send the aircraft around he replied that the citation was past the white line. Local never got up from his chair to locate either aircraft or his chair sits low and has limited fields of view. Also by choosing this sequence of traffic local delayed two air carriers waiting at the runway.I would recommend that local be counseled to insure a proper scan and that he stands to see the aircraft when they are this close. In addition we all know that regardless of how one may feel about what a controller in charge/sup is telling you to do; you should comply.

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Original NASA ASRS Text

Title: Ontario Ground Controller also working as Controller In Charge reported a loss of separation due to the local Controller not identifying an aircraft on final while previous arrival was still on the runway.

Narrative: At the time of the incident I was working ground and Controller in Charge (CIC) combined and [name removed] was working Local control. Runway 26R was closed so we're were operating with a single runway; runway 26L. Local had Citation rolling out 26L and [a] Cherokee cleared for the option 26L. The Citation slowed down to exit taxiway Q but instead Local instructed the Citation to turn left at taxiway P. At this time the Cherokee was already within a half mile of the threshold but Local never scanned to locate both aircraft. When Local told the Cherokee to turn at P; I immediately informed him of both aircraft positions and he ignored me. The Citation was taxiing slowly down the runway and was still on the runway when the Cherokee crossed the threshold and an altitude unknown. However before the incursion happened I instructed Local to send the Cherokee around twice and he disregarded my instructions. The second time I told him to send the aircraft around he replied that the Citation was past the white line. Local never got up from his chair to locate either aircraft or his chair sits low and has limited fields of view. Also by choosing this sequence of traffic Local delayed two air carriers waiting at the runway.I would recommend that Local be counseled to insure a proper scan and that he stands to see the aircraft when they are this close. In addition we all know that regardless of how one may feel about what a CIC/Sup is telling you to do; you should comply.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.