The tower controller in charge observed a truck entering a taxiway. The ground controller did not se...

Narrative:

I was working controller in charge position. I saw a cessna turning off of the runway at the taxiway and turn to the west. Approximately 125 feet east of that; I saw a large box truck turn out of the space between hangar rows and drive onto a taxiway to avoid a vehicle parked at the end of a hangar row and turn into the space between hangar rows to exit the airport. After ground control issued taxi instructions to the cessna to taxi I asked ground control if he saw that box truck at the hangar row. He stood up because he could not see this area from where he was sitting; and said 'no.' the truck caused no safety issue with the cessna because it turned west. If the cessna had turned east; they would have been approximately 75 feet apart and facing each other.the ground control position has to be moved because it cannot see the portion of the airport that has had the most taxiway deviations in the past 24 years. This is the fourth time I have reported this problem and it needs to be fixed. Will it actually take two aircraft or vehicles hitting before anything is done? It is not only blocking the ground control scan of the taxiway but it also blocks the local control scan of the runways as has been reported in previous reports.

Original NASA ASRS Text

Title: The Tower Controller in Charge observed a truck entering a taxiway. The Ground Controller did not see the truck. The CIC reports this portion of the airport is blocked from the view of the Local and Ground controllers.

Narrative: I was working Controller In Charge position. I saw a Cessna turning off of the runway at the taxiway and turn to the west. Approximately 125 feet East of that; I saw a large box truck turn out of the space between hangar rows and drive onto a taxiway to avoid a vehicle parked at the end of a Hangar row and turn into the space between hangar rows to exit the airport. After Ground Control issued taxi instructions to the Cessna to taxi I asked Ground Control if he saw that box truck at the hangar row. He stood up because he could not see this area from where he was sitting; and said 'no.' The truck caused no safety issue with the Cessna because it turned West. If the Cessna had turned East; they would have been approximately 75 feet apart and facing each other.The Ground Control position has to be moved because it CANNOT SEE THE PORTION OF THE AIRPORT THAT HAS HAD THE MOST TAXIWAY DEVIATIONS IN THE PAST 24 YEARS. This is the fourth time I have reported this problem and it needs to be fixed. Will it actually take two aircraft or vehicles hitting before anything is done? It is not only blocking the Ground Control scan of the taxiway but it also blocks the Local control scan of the runways as has been reported in previous reports.

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.

Attributes
ACN	1351593
Time
Date	201604
Local Time Of Day	1801-2400
Place
Locale Reference	POC.Airport
State Reference	CA
Aircraft 1
Make Model Name	Cessna Single Piston Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	Taxi
Route In Use	None
Person 1
Function	Supervisor / CIC
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Time Certified In Pos 1 (yrs) 24.0
Events
Anomaly	ATC Issue All Types Conflict Ground Conflict Less Severe

The tower controller in charge observed a truck entering a taxiway. The ground controller did not see the truck. The controller in charge reports this portion of the airport is blocked from the view of the local and ground controllers.