Although probably not applicable in this case, deployment of the AFS could also adversely affect the available crash/fire category for an airport. The category is based on the number of firefighters and the amount of fire suppressant available and also the time it would take to deploy the vehicles. If water or foam is used then the available fire category is reduced until the vehicle can be replenished. If the fire category available is below that required for a certain aircraft type then landings by that aircraft could be suspended. If memory serves correct.