Air Traffic Control Developmental
Communication Breakdown; Situational Awareness
ATC Issue All Types; Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Incursion Runway
Flight Crew Took Evasive Action
Procedure; Human Factors
I was working Ground Control; Flight Data; Clearance Delivery. I had Aircraft X taxi from the east to west ramp via Bravo and hold short of Runway XXL approach end. I coordinated crossing with local via TVS [Tower Voice Switch]. I crossed Aircraft X and gave hold instruction of Runway XXR at Victor. Local had a helicopter high on final. Local coordinated crossing observed and gave a crossing on Runway XXR/V; I just responded roger. I crossed Aircraft X; still on a taxi speed. Local did point out the helicopter high on final and had his memory aid for crossing. I noticed that the helicopter was still on short final. I advised local that Aircraft X is crossing. We should always use proper coordination; read back and be specific and don't assume.
I was working Local Control and CIC alongside a coworker who was working Ground Control. Aircraft Y in the right closed traffic pattern was given an option clearance for Runway XXR. Aircraft X was with Ground Control holding short of the approach end of Runway XXR. Local Control pointed out and informed Ground Control of the helicopter traffic on a high short final and then proceeded to approve Ground Control to cross Runway XXR on the recorded line. Local Control and Ground Control had a misunderstanding on the runway crossing and as the helicopter was crossing the runway threshold on a high approach (approximately 200-300 ft. AGL); Aircraft X had started to cross Runway XXR. Aircraft Y questioned the operation. Although Ground Control acknowledged the helicopter traffic; Local Control did not anticipate Ground control to cross Aircraft X when they did. Recommend to give runway crossings only after runway threshold has been crossed.
ATC Controllers and small aircraft pilot reported a miscommunication between Local and Ground Control that resulted in a critical ground conflict.