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Additional reports over other points may be requested by the
appropriate ATS unit.
4.11.1.2 On routes not defined by designated significant
points, position reports shall be made by the aircraft as soon as
possible after the first half hour of flight and at hourly intervals
thereafter, except as provided in 4.11.1.3. Additional reports at
shorter intervals of time may be requested by the appropriate
ATS unit.
4.11.1.3 Under conditions specified by the appropriate
ATS authority, flights may be exempted from the requirement
to make position reports at each designated compulsory
reporting point or interval. In applying this, account should be
taken of the meteorological requirement for the making and
reporting of routine aircraft observations.
Note.— This is intended to apply in cases where adequate
flight progress data are available from other sources, e.g.
radar (see, Chapter 8, 8.6.4.4), and in other circumstances
where the omission of routine reports from selected flights is
found to be acceptable.
4.11.1.4 The position reports required by 4.11.1.1 and
4.11.1.2 shall be made to the ATS unit serving the airspace in
which the aircraft is operated. In addition, when so prescribed
by the appropriate ATS authority in aeronautical information
publications or requested by the appropriate ATS unit, the last
position report before passing from one FIR or control area to
an adjacent FIR or control area shall be made to the ATS unit
serving the airspace about to be entered.
4.11.1.5 If a position report is not received at the
expected time, subsequent control shall not be based on the
assumption that the estimated time is accurate. Immediate
action shall be taken to obtain the report if it is likely to have
any bearing on the control of other aircraft.
4.11.2 Contents of voice position reports
4.11.2.1 The position reports required by 4.11.1.1 and
4.11.1.2 shall contain the following elements of information,
except that elements (4), (5) and (6) may be omitted from
position reports transmitted by radiotelephony, when so
prescribed on the basis of regional air navigation agreements:
1) aircraft identification
2) position
3) time
4) flight level or altitude, including passing level and
cleared level if not maintaining the cleared level
5) next position and time over
6) ensuing significant point.
4.11.2.1.1 Element (4), flight level or altitude, shall,
however, be included in the initial call after changing to a new
radio frequency.
4.11.2.2 When assigned a speed to maintain, the flight
crew shall include this speed in their position reports. The
Chapter 4. General Provisions for Air Traffic Services 4-11
1/11/01
assigned speed shall also be advised on first contact with an
ATC unit after a frequency change, whether or not a full
position report is required.
Note.— Omission of element (4) may be possible when
flight level or altitude, as appropriate, derived from SSR
Mode C information can be made continuously available to
controllers in labels associated with the radar position
indication of aircraft and when adequate procedures have
been developed to guarantee the safe and efficient use of SSR
Mode C information.
4.11.3 Transmission of ADS reports
The position reports shall be made automatically to the ATS
unit serving the airspace in which the aircraft is operating. The
requirements for the transmission and contents of automatic
dependent surveillance (ADS) reports shall be established by
the controlling ATC unit on the basis of current operational
conditions and communicated to the aircraft and acknowledged
through an ADS agreement.
4.11.4 Contents of ADS reports
4.11.4.1 ADS reports shall be composed of data blocks
selected from the following:
a) Aircraft Identification
b) Basic ADS
latitude
longitude
altitude
time
figure of merit
c) Ground vector
track
ground speed
rate of climb or descent
d) Air vector
heading
Mach or IAS
rate of climb or descent
e) Projected profile
next waypoint
estimated altitude at next waypoint
estimated time at next waypoint
(next + 1) waypoint
estimated altitude at (next + 1) waypoint
estimated time at (next + 1) waypoint
f) Meteorological information
wind speed
wind direction
wind quality flag
temperature
turbulence (if available)
humidity (if available)
g) Short-term intent
latitude at projected intent point
longitude at projected intent point
altitude at projected intent point
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