ENR 1.13   UNLAWFUL INTERFERENCE

1  An aircraft which is being subjected to unlawful interference shall endeavour to notify the appropriate ATS unit of this fact, any significant circumstances associated therewith and any deviation from the current flight plan necessitated by the circumstances, in order to enable the ATS unit to give priority to the aircraft and to minimize conflict with other aircraft.
2  Should an aircraft in flight be subjected to unlawful interference, the pilot-in-command shall endeavour to set the transponder to Mode 3/A Code 7500 to give indication of the situation unless circumstances warrant the use of Code 7700.
2.1  A pilot, having selected Mode 3/A Code 7500 and subsequently requested to confirm this code by ATC shall, according to circumstances, either confirm this or not.
3  If an aircraft is subjected to unlawful interference, the pilot-in-command shall attempt to land as soon as practicable at the nearest suitable aerodrome or at a dedicated aerodrome assigned by the appropriate authority unless considerations aboard the aircraft dictate otherwise.
4  The following procedures are intended for use by aircraft when unlawful interference occurs and the aircraft is unable to notify an ATS unit of this fact.
4.1  If the pilot-in-command cannot proceed to the aerodrome that nearest suitable or assigned by the appropriate authority, he/she should attempt to continue flying on the assigned track and at the assigned cruising level at least until able to notify an ATS unit or until within radar or ADS-B coverage.
4.2  When an aircraft subjected to an act of unlawful interference must depart from its assigned track or its assigned cruising level without being able to make radiotelephony contact with ATS, the pilot-in-command should, whenever possible:
4.2.1  Attempt to broadcast warnings on the VHF channel in use or the VHF emergency frequency, and other appropriate channels, unless considerations aboard the aircraft dictate otherwise and try to notify the situation of unlawful interference by using onboard equipment such as transponder and data link.
4.2.2  Proceed at a level which differs from the cruising levels normally used for IFR flight by:

  1. 150 M(500 FT) in an area where a vertical separation minimum of 300 M(1 000 FT) is applied; or

  2. 300 M(1 000 FT) in an area where a vertical separation minimum of 600 M(2 000 FT) is applied.

5  Pilot should take on appropriate action for Unlawful interference in accordance with the regulations concerned (ICAO Annex 2, 11 Doc 4444, and Doc 8168, etc) and comply with the instructions of the Authorities concerned.