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required, communications exchanged between the
aircraft and any one of the other stations.
e. Stations providing regular network service to
aircraft operation along route segments in an ACC's
FIR are termed regular stations. Other network
stations will only be required to assist communications
for that FIR in the event of communications
failure.
f. When communications permit, aircraft should
transmit their messages to the primary station of the
network from which they can most readily be
delivered to their ultimate destination. In particular,
aircraft reports required by ATC should be
transmitted to the network station serving the ATC
center in whose area the aircraft is flying. Conversely,
messages to aircraft in flight should be transmitted
direct to the aircraft by the network station serving the
location of the originator.
g. Messages passed from aircraft to a network
station should be intercepted and acknowledged by
other stations which serve locations where the
information is also required. Such intercepts provide
instantaneous delivery of information and eliminates
the transmission of messages over the AFTN.
Networks may not be used for transmission of aircraft
reports except under the intercept principle.
Acknowledgments of intercept shall be made
immediately after the acknowledgment of receipt by
the station to which the message was passed. In the
absence of acknowledgment of intercept within
1minute, the station accepting the message from the
aircraft shall forward the message via the AFTN to
the ultimate destination.
h. In areas or on routes where radio operations,
lengths of flights, or distance between stations
require additional measures to ensure continuity of
communications throughout the route segment, the
stations shall share the responsibility of primary
guard whereby each station will provide the primary
guard for that portion of the flight during which the
messages from the aircraft can be handled most
effectively by that station.
i. During its tenure of primary guard, each station
will:
1. Be responsible for designating primary and
secondary frequencies for communications with
aircraft.
2. Receive all position reports and handle other
messages from and to the aircraft essential to the safe
conduct of the flight.
3. Be responsible for the action required in case
of failure of communication.
j. Transfer of primary guard from one primary
station to the next will normally take place at the time
of traversing FIR or control area boundaries. When
communications conditions so demand, a station
may be required to retain primary guard beyond
geographical boundaries or release its guard before
the aircraft reaches a boundary.
7-1-13. AIREPs (POSITION REPORTS)
a. AIREPs are messages from an aircraft to a
ground station. AIREPs are normally comprised of
the aircraft's position, time, flight level, ETA over its
next reporting point, destination ETA, fuel remaining,
and meteorological information. When recording
an AIREP on data terminals or written copy, the
following procedures shall be used.
1. Each line shall begin at the left margin.
2. A new line shall be used for each
transmission.
3. If communications allow, each report shall
contain the following items in the order shown:
(a) Message type ARP.
(b) Call sign of the calling station (aircraft).
(c) Text of the message.
(d) Call sign of the station called or receiving
station followed by the appropriate abbreviation to
indicate received, readback, or no reply heard.
(e) Call sign of station(s) acknowledging
intercept followed by appropriate abbreviation to
indicate received.
(f) Designation of frequency used.
EXAMPLE-
*2866QM 8903VO 13300YH
2/14/08 JO 7110.10T
Messages and Formats 7-1-7
2932QI *5631TY 11384XM
2998QL 6532UA 13294YF
5628TO 10048WH 17904ZC
*For Alaskan domestic use only.
(g) Time in UTC of the communication.
4. Missing parts of the message text shall be
indicated by the letter M.
EXAMPLEARP
CPC583 KBRO 2100 F330 MMTM 2128
ETA XMMMX 2248 FUEL 0324
KNEW RB
MMMX R
TO2103
b. AIREPs may be filed from any aircraft inflight
within World Meteorological Organization (WMO)
areas of responsibility in conformity with ICAO
requirements for position, operational, or
meteorological reporting in AIREP format. AIREP
information shall be disseminated to ATC, company,
and meteorological offices as required. AIREPs
consist of three sections comprised of 12 items.
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