Aviation security, like flight safety - comprises multiple layers. The principle being that when any one layer is breached, a subsequent layer will maintain the safety of the system. Ultimately, national governments control the airspace in which we fly, and most have forces available to secure that airspace. A meeting of the ECA Security Group has just reviewed recent cases where civil aircraft have been intercepted by the military - albeit unnecessarily - within European airspace.
The military's first intention - having intercepted your aircraft - will be to ascertain that your flight deck is 'secure' (any doubt would have been 'key' in the authorities decision to 'go' for your interception in the first place). Your intention should be to indicate to the interceptor/authorities, that your flight deck is and remains secure, as quickly and as clearly as possible.
Some of the things to bear in mind if intercepted are:
- That you should comply with instructions given by the intercepting aircraft - responding to visual signals as required.
- Notify the appropriate ATS unit of your interception (if all has gone to plan, they should already be involved) and importantly - try to notify your company, so that its 'assessor' can liaise with the authorities. The latter can be key to a safe and early withdrawal of intercepting aircraft.
- Attempt to establish radio communication with the intercepting aircraft by making a general call on 121.5, giving your call sign, nature of flight and intentions. (It's well worth refreshing your memory of ICAO standard interception procedures and signals).