1.

An aircraft which is being subjected to unlawful interference shall endeavor 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.

An aircraft equipped with an SSR transponder is expected to operate the transponder on Mode A Code 7500 to indicate specifically that it is the subject of unlawful interference. The aircraft may operate the transponder on Mode A Code 7700, to indicate that it is threatened by grave and imminent danger and requires immediate assistance.

An aircraft equipped with other surveillance system transmitters, including ADS-B and ADS-C, might send the emergency and/or urgency signal by all of the available means.

2.1.

When a pilot has selected Mode A and code 7500 and is subsequently requested to confirm his code by ATC he shall, according to circumstances, either confirm this or not reply at all. The absence of a reply from the pilot will be taken by ATC as an indication that the use of code 7500 is not due to an inadvertent false code selection.

NOTE

(1) Action to be taken by ATS units in situations of unlawful interference is contained in ICAO Annex 11.

(2) Guidance material for use when unlawful interference occurs and the aircraft is unable to notify an ATS unit of this fact is contained in Attachment B to ICAO Annex 2.

(3) Action to be taken by SSR equipped aircraft which is being subjected to unlawful interference is contained in ICAO Annex 11 and the Doc 4444 PANS-ATM.