Uplink Message Usage

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The Uplink Message Usage is part of the the CPDLC Ground Initiated transactions grouping of the performance statistics. It counts the number of different groupings of uplink messages as described below.

Transfer of Communications

This counts messages including the following message elements:

  • UM117 CONTACT
  • UM120 MONITOR

Level Change

This counts messages including the following message elements:

  • UM6 EXPECT [level]
  • UM19 MAINTAIN [level]
  • UM20 CLIMB TO [level]
  • UM23 DESCEND TO [level]
  • UM26 CLIMB TO REACH [level] BY [time]
  • UM27 CLIMB TO REACH [level] BY [position]
  • UM28 DESCEND TO REACH [level] BY [time]
  • UM29 DESCEND TO REACH [level] BY [position]
  • UM46 CROSS [position] AT [level]
  • UM47 CROSS [position] AT OR ABOVE [level]
  • UM48 CROSS [position] AT OR BELOW [level]
  • UM61 CROSS [position] AT AND MAINTAIN [level] AT [speed]
  • UM171 CLIMB AT [verticalRate] MINIMUM
  • UM172 CLIMB AT [verticalRate] MAXIMUM
  • UM173 DESCEND AT [verticalRate] MINIMUM
  • UM174 DESCEND AT [verticalRate] MAXIMUM

Instructions

This counts messages including the following message elements:

  • UM123 SQUAWK [code]
  • UM133 REPORT PRESENT LEVEL
  • UM135 CONFIRM ASSIGNED LEVEL
  • UM148 WHEN CAN YOU ACCEPT [level]
  • UM157 CHECK STUCK MICROPHONE [frequency]
  • UM179 SQUAWK IDENT
  • UM196 [freetext]
  • UM203 [freetext]
  • UM205 [freetext]
  • UM211 REQUEST FORWARDED
  • UM213 [facilitydesignation] ALTIMETER [altimeter]
  • UM231 STATE PREFERRED LEVEL
  • UM232 STATETOP OF DESCENT
  • UM237 REQUEST AGAIN WITH NEXT UNIT

Route Changes

This counts messages including the following message elements:

  • UM64 OFFSET [specifiedDistance] [direction] OF ROUTE
  • UM73 [DepartureClearance]
  • UM74 PROCEED DIRECT TO [position]
  • UM79 CLEARED TO [position] VIA [routeClearance]
  • UM80 CLEARED [route clearance]
  • UM82 CLEARED TO DEVIATE UP TO [specifiedDistance] [direction] OF ROUTE
  • UM92 HOLD AT [position] AS PUBLISHED MAINTAIN [level]
  • UM190 FLY HEADING [degrees]

Speed Changes

This counts messages including the following message elements:

  • UM55 CROSS [position] AT [speed]
  • UM61 CROSS [position] AT AND MAINTAIN [level] AT [speed]
  • UM106 MAINTAIN [speed]
  • UM107 MAINTAIN PRESENT SPEED
  • UM108 MAINTAIN [speed] OR GREATER
  • UM109 MAINTAIN [speed] OR LESS
  • UM116 RESUME NORMAL SPEED
  • UM222 NO SPEED RESTRICTION

Heading Changes

This counts messages including the following message elements:

  • UM72 RESUME OWN NAVIGATION
  • UM94 TURN [direction] HEADING [degrees]
  • UM96 CONTINUE PRESENT HEADING
  • UM215 TURN [direction] [degrees]

Check Stuck Microphone

This counts messages including the following message elements:

  • UM157 CHECK STUCK MICROPHONE [frequency]