-
reaching block (altitude) to (altitude) (message 76).

 (3)
 ATC position reports An ATC position report is sent to the ATC center upon request or at each ATC waypoint sequencing. The automatic ATC position report function provides help to the crew by:

 -monitoring (without any ATSU request) the sequencing of each ATC waypoint in the active flight plan.
 -informing the ATSU when an ATC waypoint is actually sequenced by providing it with the ATC position report plus additional reports depending on aircraft context.
 ATC position reports are sent to the ATSU:

 -each time an ATC waypoint is sequenced,

 -upon an ATC position report request.
 The message 48: 'Position report (position report)' is the
 appropriate downlink message in response to the uplink message 147:
 'Request position report'. An ATC position report shall be sent to
 the ATSU within the downlink message.
 The list of elements composing the ATC position report is the
 following:

 -
Current A/C Lat/Long

 -
Current A/C time reference at ATC position report computation

 -
Current A/C altitude (reference depending on current A/C altitude reference)

 -NEXT ATC waypoint
 -Estimated Time of Arrival at NEXT ATC waypoint
 -ENSUIG ATC waypoint
 -Estimated Time at destination
 -
Current static air temperature

 -
Current wind direction and speed

 -
Current speed or Mach depending on guidance mode

 -
Current ground speed

 -
Current vertical direction + rate

 -
Current track angle (True or Mag depending on current North
 reference)

 -
Current True heading

 -Last ATC sequenced waypoint
 -Time of sequence of the last ATC sequenced waypoint.
 -A/C altitude at last ATC sequenced waypoint (reference depending on
 A/C attitude reference at this waypoint). If the aircraft is climbimg (respectively descending), the downlink message 29: 'climbing to (altitude)' (respectively message 30: descending to (altitude)') shall be sent to the ATSU, with the altitude target value and the altitude reference. If an offset is active, the downlink message 80: 'Deviating (distance-offset) (direction) of route' shall be sent to the ATSU with the distance and the direction of the active offset.
 (4)
 ATC confirm ATC confirm function provides (upon ATSU request) immediate real time information to the ATSU concerning the aircraft current situation and position. Several types of confirmation are available and consist of:

 -Current aircraft data

 -Aircraft target parameters

 -Flight planning elements

 -Position report (see (3)).
 The FMS acts as an information provider in response to a confirmation
 request from the ATSU.
 The FMS response consists of:

 -The requested parameter(s)

 -Additional parameters depending on aircraft context.
 The ATC confirm request uplink message consists of one of the
 following referenced messages:

 -
confirm position (message 132)

 -
confirm altitude (message 133)

 -
confirm speed (message 134)

 -
confirm assigned altitude (message 135)

 -
confirm assigned speed (message 136)

 -
confirm assigned route (message 137)

 -
confirm time over reported waypoint (message 138)

 -
confirm reported waypoint (message 139)

 -
confirm next waypoint (message 140)

 -
confirm next waypoint ETA (message 141)

 -
confirm ensuring waypoint (message 142)

 -
confirm heading (message 145)

 -
confirm ground track (message 146)

 -report distance (to/from) (position) (message 181). If a confirmation request uplink message is received, the FM shall send to the ATSU a message consisting of one or more of the following referenced messages:
 -
present position (message 33)

 -
present altitude (message 32)

 -climbing to altitude (message 29)
 -descending to altitude (message 30)
 -deviating (distance offset) (direction) of route (message 80)
 -present speed (message 34)
 -
assigned altitude (message 38)

 -
assigned speed (message 39)
　
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