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frequency for further clearances from the air traffic control
unit.
15.1.4.3 SUBSEQUENT ACTION BY THE AIR TRAFFIC
CONTROL UNIT
Immediately after such an emergency broadcast has been made
the ACC, the approach control unit, or the aerodrome control
tower concerned shall forward further clearances to all aircraft
involved as to additional procedures to be followed during and
subsequent to the emergency descent. The ATS unit concerned
shall additionally inform any other ATS units and control
sectors which may be affected.
15.2 AIR-GROUND COMMUNICATIONS
FAILURE
Note 1.— Radar procedures to be applied in relation to an
aircraft experiencing air-ground communication failure are
contained in Chapter 8, Section 8.8.3.
Note 2.— An aircraft equipped with an SSR transponder is
expected to operate the transponder on Mode A Code 7600 to
indicate that it has experienced air-ground communication
failure.
Note 3.— See also Chapter 6, 6.3.2.4 concerning departure
clearances containing no geographical or time limit for an
initial level and procedures to be applied in relation to an
aircraft experiencing air-ground communication failure under
such circumstances.
Note 4. — See also Chapter 5, 5.4.2.6.3.1, for additional
requirements applying to communication failure during the
application of the 50 NM longitudinal RNAV/RNP 10
separation minimum.
15.2.1 Action by air traffic control units when unable to
maintain two-way communication with an aircraft operating in
a control area or control zone shall be as outlined in the
paragraphs which follow.
15.2.2 As soon as it is known that two-way communication
has failed, action shall be taken to ascertain whether the
aircraft is able to receive transmissions from the air traffic
control unit by requesting it to execute a specified manoeuvre
which can be observed by radar or to transmit, if possible, a
specified signal in order to indicate acknowledgement.
15.2.3 If the aircraft fails to indicate that it is able to
receive and acknowledge transmissions, separation shall be
maintained between the aircraft having the communication
failure and other aircraft, based on the assumption that the
aircraft will:
a) if in visual meteorological conditions:
1) continue to fly in visual meteorological conditions;
2) land at the nearest suitable aerodrome; and
3) report its arrival by the most expeditious means to
the appropriate air traffic control unit; or
b) if in instrument meteorological conditions or when
conditions are such that it does not appear feasible to
complete the flight in accordance with a):
1) unless otherwise prescribed on the basis of a
regional air navigation agreement, maintain the last
assigned speed and level, or minimum flight
altitude if higher, for a period of 20 minutes
following the aircraft’s failure to report its position
over a compulsory reporting point and thereafter
adjust level and speed in accordance with the filed
flight plan;
2) proceed according to the current flight plan route to
the appropriate designated navigation aid serving
15-4 Air Traffic Management (PANS-ATM)
1/11/01
the destination aerodrome and, when required to
ensure compliance with 3) below, hold over this aid
until commencement of descent;
3) commence descent from the navigation aid
specified in 2) at, or as close as possible to, the
expected approach time last received and
acknowledged; or, if no expected approach time
has been received and acknowledged, at, or as
close as possible to, the estimated time of arrival
resulting from the current flight plan;
4) complete a normal instrument approach procedure
as specified for the designated navigation aid; and
5) land, if possible, within 30 minutes after the
estimated time of arrival specified in b) or the last
acknowledged expected approach time, whichever
is later.
Note 1.— Provisions related to minimum levels are
contained in Annex 2, 5.1.2.
Note 2.— As evidenced by the meteorological conditions
prescribed therein, 15.2.3 a) relates to all controlled flights,
whereas 15.2.3 b) relates only to IFR flights.
15.2.4 Action taken to ensure suitable separation shall
cease to be based on the assumption stated in 15.2.3 when:
a) it is determined that the aircraft is following a
procedure differing from that in 15.2.3; or
b) through the use of electronic or other aids, air traffic
control units determine that action differing from that
required by 15.2.3 may be taken without impairing
safety; or
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