Security Annex 17 to the Convention on International Civil Aviation(28)

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Note.— To indicate that it is in a state of emergency, an aircraft equipped with an appropriate data link capability and/or an SSR transponder might operate the equipment as follows:
a) on Mode A, Code 7700; or
b) on Mode A, Code 7500, to indicate specifically that it is being subjected to unlawful interference; or
c) activate the appropriate emergency and/or urgency capability of ADS; or
d) transmit the appropriate emergency message via CPDLC.
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2.22.2 When an occurrence of unlawful interference with an aircraft takes place or is suspected, ATS units shall attend promptly to requests by the aircraft. Information pertinent to the safe conduct of the flight shall continue to be transmitted and necessary action shall be taken to expedite the conduct of all phases of the flight, especially the safe landing of the aircraft.
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CHAPTER 5. ALERTING SERVICE
5.1 Application
5.1.1 Alerting service shall be provided: . . . . . . c) to any aircraft known or believed to be the subject of
unlawful interference. . . . . . .
5.2 Notification of rescue coordination centres
5.2.1 Without prejudice to any other circumstances that may render such notification advisable, air traffic services units shall, except as prescribed in 5.5.1, notify rescue coordi-nation centres immediately an aircraft is considered to be in a state of emergency in accordance with the following:
. . . . . .
b) Alert phase when:
. . . . . .
except when evidence exists that would allay apprehen-sion as to the safety of the aircraft and its occupants, or when
4) an aircraft is known or believed to be the subject of unlawful interference.
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5.5 Information to the operator
5.5.1 When an area control or a flight information centre decides that an aircraft is in the uncertainty or the alert phase, it shall, when practicable, advise the operator prior to notifying the rescue coordination centre.
Note.— If an aircraft is in the distress phase, the rescue coordination centre has to be notified immediately in accordance with 5.2.1.
5.5.2 All information notified to the rescue coordination centre by an area control or flight information centre shall, whenever practicable, also be communicated, without delay, to the operator.
5.6 Information to aircraft operating in
the vicinity of an aircraft in
a state of emergency

5.6.1 When it has been established by an air traffic services unit that an aircraft is in a state of emergency, other aircraft known to be in the vicinity of the aircraft involved shall, except as provided in 5.6.2, be informed of the nature of the emergency as soon as practicable.
5.6.2 When an air traffic services unit knows or believes that an aircraft is being subjected to unlawful interference, no reference shall be made in ATS air-ground communications to the nature of the emergency unless it has first been referred to in communications from the aircraft involved and it is certain that such reference will not aggravate the situation.
　
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