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establish communications by the regular stations have proved
unsuccessful.
5.2.2.4.4 PANS.- The provisions of 5.2.2.4.3 and
5.2.2.4.3.1 should also be applied:
a) on request of the air trafic services unit concerned;
bj when an expected communication from an aircraft has
not been received within a time period such that the
occurrence of a communication failure is suspected.
N o t e . A speczfic time period may be prescribed by the
appropriate ATS Authori@.
5.2.2.5 Transfer of HF communications
5.2.2.5.1 PANS.- An aircraft station should be advised
by the appropriate aeronautical station to transfer from one
radio frequency or network to another. In the absence of such
5.2.2.5.4 PANS.- When entering a network afer takeofl
an aircraft station should transmit its take-offtime or time
over the last check-point, to the appropriate regular station.
5.2.2.5.5 PANS.- When entering a new network, an
aircraft station should transmit the time over the last
checkpoint, or of its last reported position, to the appropriate
regular station.
5.2.2.5.6 PANS.- Before leaving the network, an aircraft
station should in all cases advise the appropriate regular
station of its intention to do so by transmitting one of the
following phrases, as appropriate:
a) when transferring to a pilot-to-controller channel:
Aircraft: CHANGING TO . . . (air traffic services unit
concernedj
b) after landing:
Aircraft: LANDED. . . (location) . . . (time)
5.2.2.6 Transfer of W F communications
5.2.2.6.1 An aircraft shall be advised by the appropriate
aeronautical station to transfer from one radio frequency to
another in accordance with agreed procedures. In the absence
of such advice, the aircraft station shall notify the appropriate
aeronautical station before such a transfer takes place.
5.2.2.6.2 When establishng initial contact on, or when
leaving, a VHF frequency, an aircraft station shall transmit
such information as may be prescribed by the appropriate
Authority.
5.2.2.7 Communications failure
5.2.2.7.1.1 When an aircraft station fails to establish
contact with the aeronautical station on the designated
Chapter 5 Annex 10 - Aeronautical Telecommunications
frequency, it shall attempt to establish contact on another
frequency appropriate to the route. If ths attempt fails, the
aircraft station shall attempt to establish communication with
other aircraft or other aeronautical stations on frequencies
appropriate to the route. In addition, an aircraft operating
within a network shall monitor the appropriate VHF frequency
for calls from nearby aircraft.
5.2.2.7.1.2 If the attempts specified under 5.2.2.7.1.1 fail,
the aircraft station shall transmit its message twice on the
designated frequency(ies), preceded by the phrase "TRANSMITTING
BLIND" and, if necessary, include the addressee(s)
for whch the message is intended.
5.2.2.7.1.2.1 PANS.- In network operation, a message
which is transmitted blind should be transmitted twice on both
primary and secondary j+equencies. Before changing frequency,
the aircraft station should announce the frequency to
which it is changing.
5.2.2.7.1.3 Receiver failure
5.2.2.7.1.3.1 When an aircraft station is unable to
establish communication due to receiver failure, it shall
transmit reports at the scheduled times, or positions, on the
frequency in use, preceded by the phrase "TRANSMITTING
BLIND DUE TO RECEIVER FAILURE. The aircraft station
shall transmit the intended message, following ths by a
complete repetition. During ths procedure, the aircraft shall
also advise the time of its next intended transmission.
5.2.2.7.1.3.2 An aircraft which is provided with air traffic
control or advisory service shall, in addition to complying with
5.2.2.7.1.3.1, transmit information regarding the intention of
the pilot-in-command with respect to the continuation of the
flight of the aircraft.
5.2.2.7.1.3.3 When an aircraft is unable to establish
communication due to airborne equipment failure it shall,
when so equipped, select the appropriate SSR code to indicate
radio failure.
N o t e . General rules which are applicable in the event of
communications failure are contained in Annex 2 to the
Convention.
b) request aircraft on the route to attempt to establish
communication with the aircraft and relay traffic, if
necessary.
5.2.2.7.2.2 The provisions of 5.2.2.7.2.1 shall also be
applied:
a) on request of the air traffic services unit concerned;
b) when an expected communication from an aircraft has
not been received within a time period such that the
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