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Authority.
5.2.2.7 Communications failure
5.2.2.7.1 Air-ground
frequency, it shall attempt to establish contact on another
frequency appropriate to the route. If this 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 which 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 frequencies. Before changing frequency,
the aircrafr 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 '"ll2ANSMI'ITING
BLIND DUE TO RECEIVER FAILURE". The aircraft station
shall transmit the intended message, following this by a
complete repetition. During this 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 vilot-in-command with resDect to the continuation of the
fight 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.
Note.- General rules which are applicable in the event of
communications failure are contained in Annex 2 to the
Convention.
5.2.2.7.2.1 When an aeronautical station has been unable
to establish contact with an aircraft station after calls on the
frequencies on which the aircraft is believed to be listening, it
shall:
5.22.7.1.1 When an aircraft station fails to establish a) request other aeronautical stations to render assistance
contact with the aeronautical station on the designated by calling the aircraft and relaying traffic, if necessary;
24/11/05
No. 80
Annex ZO - Aeronautical TelecommunicaiiOns Volume ZZ
b) request aircraft on the route to attempt to establish 5.2.3.1.2 PANS.- Messages passed from an aircmf to a
communication with the aircraft and relay traffic, if network station should, wheneverpossible, be intercepted and
necessary. achwledged by other stations of the network, which serve
locations where the infbrmatwn is also required
52.2.7.22 The provisions of 5.22.7.2.1 shall also be
applied: Note I.- Determination of the arrangements for dissemination
of air-ground messages without address will be a
a) on request of the air traffic sexvices unit concerned; matter for multilateral or local agreement.
b) when an expected communication from an aircraft has Note 2.- In principle, the number of stntions required to
not been received within a time period such that the intercept are to be kept to a minimum consistent with the
occurrence of a communication failure is suspected. operational requirement.
Note.- A specific time period may be prescribed by the
appropriate ATS Authority.
5.22.7.2.3 Recommendation.- If the attempts specified
in 5.2.2.7.2.1 fail, the aeronautical station should transmit
messages addressed to the aircraft, other than messages
containing air tm@c control clearances, by blind transmission
on the frequency(ies) on which the aircraft is believed to be
listening.
5.2.3.1.2.1 PANS.- Acknowledgement of intercept
should be nu& immediately afer the acknowledgement of
receipt by the station to which the message was passed.
5.2.3.1.2.2 PANS.- Acknowledgement of an intercept
message should be made by transmitring the radio call sign of
the station having intercepted the message, followed by the
word ROGER, if desired, and the call sign of the station
having transmitted the message.
5.2.2.7.2.4 Blind transmission of air traffic control 5.2.3.1.2.3 PANS.- In the absence of acknowledgement
clearances shall not be made to aircraft, except at the specific intercept one ,,,inUte, the accepting the
request of the originator. message from the aircrafr should forward it, normally over the
　
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