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relevant to a state of emergency of an aircraft operating within
the flight information region or control area concerned and
for forwarding such information to the appropriate rescue
coordination centre.
5.1.3 In the event of a state of emergency arising to an
aircraft while it is under the control of an aerodrome control
tower or approach control unit, such unit shall notify immediately
the flight information centre or area control centre
responsible which shall in turn notify the rescue coordination
centre, except that notification of the area control centre, flight
information centre, or rescue coordination centre shall not be
required when the nature of the emergency is such that the
notification would be superfluous.
5.1.3.1 Nevertheless, whenever the urgency of the situation
so requires, the aerodrome control tower or approach control
unit responsible shall first alert and take other necessary steps
to set in motion all appropriate local rescue and emergency
organizations which can give the immediate assistance
required.
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 coordination
centres immediately an aircraft is considered to be in a
state of emergency in accordance with the following:
a) Uncertainty phase when:
1) no communication has been received from an aircraft
within a period of thirty minutes after the time a
communication should have been received, or from
the time an unsuccessful attempt to establish communication
with such aircraft was first made,
whichever is the earlier, or when
2) an aircraft fails to arrive within thirty minutes of the
estimated time of arrival last notified to or estimated
by air traffic services units, whichever is the later,
except when no doubt exists as to the safety of the
aircraft and its occupants.
b) Alert phase when:
1) following the uncertainty phase, subsequent attempts
to establish communication with the aircraft or
inquiries to other relevant sources have failed to
reveal any news of the aircraft, or when
2) an aircraft has been cleared to land and fails to land
within five minutes of the estimated time of landing
and communication has not been re-established with
the aircraft, or when
3) information has been received which indicates that the
operating efficiency of the aircraft has been impaired,
but not to the extent that a forced landing is likely,
except when evidence exists that would allay apprehension
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.
c) Distress phase when:
1) following the alert phase, further unsuccessful attempts
to establish communication with the aircraft and
more widespread unsuccessful inquiries point to the
probability that the aircraft is in distress, or when
2) the fuel on board is considered to be exhausted, or to
be insufficient to enable the aircraft to reach safety,
or when
3) information is received which indicates that the
operating efficiency of the aircraft has been impaired
to the extent that a forced landing is likely, or when
4) information is received or it is reasonably certain that
the aircraft is about to make or has made a forced
landing,
Annex 11 — Air Traffic Services Chapter 5
1/11/01 5-2
except when there is reasonable certainty that the
aircraft and its occupants are not threatened by grave
and imminent danger and do not require immediate
assistance.
5.2.2 The notification shall contain such of the following
information as is available in the order listed:
a) INCERFA, ALERFA or DETRESFA, as appropriate to
the phase of the emergency;
b) agency and person calling;
c) nature of the emergency;
d) significant information from the flight plan;
e) unit which made last contact, time and means used;
f) last position report and how determined;
g) colour and distinctive marks of aircraft;
h) dangerous goods carried as cargo;
i) any action taken by reporting office; and
j) other pertinent remarks.
5.2.2.1 Recommendation.— Such part of the information
specified in 5.2.2, which is not available at the time
notification is made to a rescue coordination centre, should be
sought by an air traffic services unit prior to the declaration
of a distress phase, if there is reasonable certainty that this
phase will eventuate.
　
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