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other aircraft in flight every assistance in establishing
communication with the aircraft and determining its
position.
Note.— The requirements in d) and e) apply also to ATS
units informed in accordance with c).
15.4.1.1.2 When the aircraft’s position is established, the
air traffic services unit shall:
a) advise the aircraft of its position and corrective action
to be taken; and
b) provide, as necessary, other ATS units and appropriate
military units with relevant information concerning the
strayed aircraft and any advice given to that aircraft.
15.4.1.2 As soon as an air traffic services unit becomes
aware of an unidentified aircraft in its area, it shall endeavour
to establish the identity of the aircraft whenever this is
necessary for the provision of air traffic services or required by
the appropriate military authorities in accordance with locally
agreed procedures. To this end, the air traffic services unit
shall take such of the following steps as are appropriate in the
circumstances:
a) attempt to establish two-way communication with the
aircraft;
b) inquire of other air traffic services units within the FIR
about the flight and request their assistance in
establishing two-way communication with the aircraft;
c) inquire of air traffic services units serving the adjacent
FIRs about the flight and request their assistance in
establishing two-way communication with the aircraft;
d) attempt to obtain information from other aircraft in the
area.
15.4.1.2.1 The air traffic services unit shall, as necessary,
inform the appropriate military unit as soon as the identity of
the aircraft has been established.
Note.— Requirements for coordination between military
authorities and air traffic services are specified in Annex 11,
2.16.
15.4.2 Interception of civil aircraft
15.4.2.1 As soon as an air traffic services unit learns that
an aircraft is being intercepted in its area of responsibility, it
shall take such of the following steps as are appropriate in the
circumstances:
Chapter 15. Procedures related to Emergencies, Communication Failure and Contingencies 15-7
1/11/01
a) attempt to establish two-way communication with the
intercepted aircraft on any available frequency,
including the emergency frequency 121.5 MHz, unless
such communication already exists;
b) inform the pilot of the intercepted aircraft of the
interception;
c) establish contact with the intercept control unit
maintaining two-way communication with the
intercepting aircraft and provide it with available
information concerning the aircraft;
d) relay messages between the intercepting aircraft or the
intercept control unit and the intercepted aircraft, as
necessary;
e) in close coordination with the intercept control unit
take all necessary steps to ensure the safety of the
intercepted aircraft; and
f) inform ATS units serving adjacent FIRs if it appears
that the aircraft has strayed from such adjacent FIRs.
15.4.2.2 As soon as an air traffic services unit learns that
an aircraft is being intercepted outside its area of responsibility,
it shall take such of the following steps as are
appropriate in the circumstances:
a) inform the ATS unit serving the airspace in which the
interception is taking place, providing this unit with
available information that will assist in identifying the
aircraft and requesting it to take action in accordance
with 15.4.2.1;
b) relay messages between the intercepted aircraft and the
appropriate ATS unit, the intercept control unit or the
intercepting aircraft.
15.4.3 Fuel dumping
15.4.3.1 GENERAL
15.4.3.1.1 An aircraft in an emergency or other urgent
situations may need to dump fuel so as to reduce to maximum
landing mass in order to effect a safe landing.
15.4.3.1.2 When an aircraft operating within controlled
airspace needs to dump fuel, the flight crew shall advise ATC.
The ATC unit should then coordinate with the flight crew the
following:
a) the route to be flown, which, if possible, should be
clear of cities and towns, preferably over water and
away from areas where thunderstorms have been
reported or are expected;
b) the level to be used, which should be not less than
1 800 m (6 000 ft); and
c) the duration of the fuel dumping.
15.4.3.2 SEPARATION
Other known traffic should be separated from the aircraft
dumping fuel by:
a) at least 19 km (10 NM) horizontally, but not behind the
aircraft dumping fuel;
b) vertical separation if behind the aircraft dumping fuel
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