A local controller observed an aircraft taxiing across the same runway as a landing aircraft landing...

Attributes
ACN	1454654
Time
Date	201706
Local Time Of Day	1801-2400
Place
Locale Reference	DVT.Tower
State Reference	AZ
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	VFR
Aircraft 2
Make Model Name	Cessna Aircraft Undifferentiated or Other Model
Flight Phase	Taxi
Route In Use	None
Flight Plan	IFR
Person 1
Function	Local
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 11.0
Person 2
Function	Ground Instructor
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 18.5
Events
Anomaly	ATC Issue All Types Conflict Ground Conflict Critical Deviation - Procedural Published Material / Policy

Narrative:

Off frequency the trainee on ground control coordinated to cross the runway behind aircraft X on a half mile final. I told him that would be fine. He then keyed up to record the crossing coordination and I said 'behind the aircraft X short final; cross runway 25L at taxiway B5'. I then turned my attention to aircraft Y who was landing long on runway 25L. Aircraft Y was still airborne; roughly 10 feet above the runway when the trainee on ground control keyed up the frequency and said 'crossing complete'. I then turned and saw aircraft Z turning onto taxiway c from C5 and realized that the ground trainee had crossed the runway in front of aircraft Y as [it] was over the runway landing. Aircraft Y said nothing about the [aircraft] that had crossed about 2000 feet in front of him. The ground trainer should have heard the trainee issue the crossing and stopped it from happening. My view of aircraft Z was also obscured by the support beam on the window in the tower. I had to move to the side to see aircraft Z.

Original NASA ASRS Text

Title: A Local Controller observed an aircraft taxiing across the same runway as a landing aircraft landing was touching down.

Narrative: Off frequency the trainee on ground control coordinated to cross the runway behind Aircraft X on a half mile final. I told him that would be fine. He then keyed up to record the crossing coordination and I said 'Behind the Aircraft X short final; cross Runway 25L at taxiway B5'. I then turned my attention to Aircraft Y who was landing long on runway 25L. Aircraft Y was still airborne; roughly 10 feet above the runway when the trainee on ground control keyed up the frequency and said 'crossing complete'. I then turned and saw Aircraft Z turning onto taxiway c from C5 and realized that the ground trainee had crossed the runway in front of Aircraft Y as [it] was over the runway landing. Aircraft Y said nothing about the [aircraft] that had crossed about 2000 feet in front of him. The ground trainer should have heard the trainee issue the crossing and stopped it from happening. My view of Aircraft Z was also obscured by the support beam on the window in the tower. I had to move to the side to see Aircraft Z.

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.

A local controller observed an aircraft taxiing across the same runway as a landing aircraft landing was touching down.