FAQ n.142310

A change of foam, even when changing from AFFF to F3, does not directly affect the RFFS level of protection to be ensured by the airport operator. As such, the change is not identified as one requiring prior approval by Competent Authority (see AMC1 ADR.0O.B.040 (a);(b).

However, using a new type of foam could have a potential impact on the efficiency and organization of RFFS due to the different performances or application procedures as well as the challenges of such transition on the capacity to maintain an appropriate operational level of protection.

Therefore, it would be advisable for an airport operator to consider initiating and documenting a safety assessment – potentially supported by testing – before transitioning from AFFF to F3.