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 a labelled form, and when adequate procedures have been developed to guarantee the safe and efficient use of SSR Mode C information.
14.3 Transmission of ADS reports
14.3.1 The position reports shall be made automatically to the air traffic services unit serving the airspace in which the aircraft is operating. The requirements for the transmission and contents of 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.
14.4 Contents of ADS reports
14.4.1 ADS reports shall be composed of data blocks selected from the following:
II. General Provisions
a) Basic ADS Latitude Longitude Altitude Time Figure of merit
b) Ground vector Track Ground speed Rate of climb or descent
c) Air vector Heading Mach or IAS Rate of climb or descent
d) Projected profile Next way-point Estimated altitude at next way-point Estimated time at next way-point (Next + 1) way-point Estimated altitude at (next + 1) way-point Estimated time at (next + 1) way-point
e) Meteorological information Wind speed Wind direction Temperature Turbulence (if available) Humidity (if available)
f) Short-term intent Latitude at projected intent point Longitude at projected intent point Altitude at projected intent point Time of projection
If an altitude, track or speed change is predicted to occur between the aircraft’s current position and the projected intent point, additional information would be provided in an intermediate intent block as follows:
Distance from current point to change point
Track from current point to change point
Altitude at change point
Predicted time to change point
g) Extended projected profile (in response to an interrogation from the ground system) Next way-point Estimated altitude at next way-point Estimated time at next way-point (Next + 1) way-point Estimated altitude at (next + 1) way-point Estimated time at (next + 1) way-point (Next + 2) way-point Estimated altitude at (next + 2) way-point Estimated time at (next + 2) way-point [repeated for up to (next + 128) way-points]
14.4.2 The basic ADS data block shall be required from all ADS-equipped aircraft. Remaining ADS data blocks shall be included as necessary. In addition to any requirements concerning its transmission for ATS purposes, data block e) (Meteorological information) shall be transmitted in accor-dance with Annex 3, 5.4.1.
14.4.3 In addition to the above data blocks, other information shall be transmitted, including a block identifier, aircraft identification and 24-bit aircraft address.
15. Reporting of operational and meteorological information
15.1 When operational and/or routine meteorological information is to be reported by an aircraft en route at points or times where position reports are required in accordance with 14.1.1 and 14.1.2, the position report shall be given in the form of a routine air-report. Special aircraft observations shall be reported as special air-reports. All air-reports shall be reported as soon as is practicable.
15.2 When ADS is being applied, routine air-reports shall be made in accordance with 14.4.2.
15.3 Contents of routine air-reports
15.3.1 Routine air-reports transmitted by voice or data link, when ADS is not being applied, shall give information relating to such of the following elements as are necessary for compliance with 15.3.2:
Section 1.— Position information:
1) Aircraft identification
2) Position
3) Time
4) Flight level or altitude
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