The emergency Aircraft Arresting System (AAS) covered in this specification is intended for use in the runway overrun, and is designed and suitable for departure end engagements only. The TAAS is a secondary braking system available in case of failure of a successful engagement by the primary AAS i.e., Barrier Arresting Kit-12 (BAK-12) or Mobile Aircraft Arresting System (MAAS). An AAS is a military-unique application since it is capable of directly interfacing with tail hook equipped fighter aircraft during critical moments of operation.