ENR 1.13  Unlawful interference

1.  General

1.1 The pilot of an aircraft subject to unlawful interference or the threat of unlawful interference must endeavor to advise ATS of the fact, together with details of any subsequent deviation from the current flight plan, and any other significant factors affecting the operation. This will enable ATS to give priority to the aircraft and alert organizations likely to be involved.

2.  Procedures

2.1 The following procedures should be followed:

  1. switch transponder to code 7500 MODE A;

  2. advise ATS of details in plain language if possible;

  3. if use of radio is restricted, insert the phrase “CHANNEL SEVEN FIVE ZERO ZERO” into any radiotelephone (RTF) transmission after the aircraft’s callsign, if it is safe and practicable to do so.

2.2 Whenever the pilot of an aircraft operates a transponder on code 7500, the controller will attempt to verify by RTF that the code selection is intentional.

“(AIRCRAFT CALLSIGN) CONFIRM SQUAWKING SEVEN FIVE ZERO ZERO”.

2.3 If the aircraft is not subject to unlawful interference, the pilot should respond accordingly.
2.4 If ATS personnel recognise any indication of unlawful interference to an aircraft, they will promptly action any requests originating from the aircraft. Information pertinent to the safe conduct of the flight will continue to be transmitted by ATS, and appropriate action taken to expedite the conduct of the flight.