Asterix category 004 - Safety Net Messages

category: 004

edition: 1.12

date: 2020-10-28

Preamble

Surveillance data exchange.

Description of standard data items

I004/000 - Message Type

Definition: This Data Item allows for a more convenient handling of the messages at the receiver side by further defining the type of transaction.

Structure:

Notes:

  1. In applications where transactions of various types are exchanged, the Message Type Data Item facilitates the proper message handling at the receiver side.

  2. All Message Type values are reserved for common standard use.

  3. Message Types 33 to 37 have been designed for applications supporting the ATCO in the optimisation of separation during final approach. They provide information required to indicate to the ATCO the closest possible distance of a following aircraft in relation to a leading aircraft. This allows to make optimum use of the available runway capacity.

  4. The list of items present for the 31 types of messages is defined in the following 4 tables. M stands for mandatory, O for optional, X for never present. :

    item 001 002 003 004 005 006 007 008
I004/000 M M M M M M M M
I004/010 M M M M M M M M
I004/015 O O O O O O O O
I004/020 M M M M M M M M
I004/030 X M M M M M M M
I004/035 X X X X X X M X
I004/040 X M M M M M M M
I004/045 X O O O O O O O
I004/060 M X X X X X X X
I004/070 X X X O O X O X
I004/074 X M X X X X X X
I004/075 X X M X X X X M
I004/076 X X X X X O X O
I004/100 X X X X M X X O
I004/110 X O O O O O O O
I004/120 X X X M M X M X
I004/170 X O O O O O O O
I004/171 X X X X X X O X
I004/RE O O O O O O O O

item 009 010 011 012 013 014 015 016
I004/000 M M M M M M M M
I004/010 M M M M M M M M
I004/015 O O O O O O O O
I004/020 M M M M M M M M
I004/030 M M M M M M M M
I004/035 M X M M M M O X
I004/040 M M M M M M M M
I004/045 O O O O O O O O
I004/060 X X X X X X X X
I004/070 O X O O O O O X
I004/074 X X X X X X X X
I004/075 X X X X X X X X
I004/076 X X X X X X X X
I004/100 M M M M M M M M
I004/110 O O O O O O O O
I004/120 M M M M M O O O
I004/170 O O O O O O O O
I004/171 O X O O O O O X
I004/RE O O O O O O O O

item 017 018 019 020 021 022 023 024
I004/000 M M M M M M M M
I004/010 M M M M M M M M
I004/015 O O O O O O O O
I004/020 M M M M M M M M
I004/030 O X M M M M M M
I004/035 O X M X X X M X
I004/040 M M M M M M M M
I004/045 O O O O O O O O
I004/060 X X X X X X X X
I004/070 X O O X X O O X
I004/074 X X X X X X X X
I004/075 X X X X X X X X
I004/076 X X X X X X X O
I004/100 X X X O O M M O
I004/110 X X O O O O O O
I004/120 X X O M O M M O
I004/170 X M O O O O O O
I004/171 X O O X X X O X
I004/RE O M O O O O O O

item 025 026 027 028 029 030 031 032
I004/000 M M M M M M M M
I004/010 M M M M M M M M
I004/015 O O O O O O O O
I004/020 M M M M M M M M
I004/030 M M M M M M M M
I004/035 X X X X O O M O
I004/040 M M M M M M M M
I004/045 O O O O O O O O
I004/060 X X X X X X X X
I004/070 X X X X O O O O
I004/074 X X O X O X X X
I004/075 X X X X O X X X
I004/076 X O O O O X X X
I004/100 O O O O O O O O
I004/110 O O O O O O O O
I004/120 O O O X O O O O
I004/170 O O O O O O O O
I004/171 X X X X O O O O
I004/RE O O O O O O O O

item 033 034 035 036 037 038 039 040
I004/000 M M M M M M M M
I004/010 M M M M M M M M
I004/015 O O O O O O O O
I004/020 M M M M M M M M
I004/030 M M M M M M M M
I004/035 M M M X O M X X
I004/040 M M M M M M M M
I004/045 O O O O O O O O
I004/060 X X X X X X X X
I004/070 O O M X X X X X
I004/074 X X X X X X X X
I004/075 X X X X X X X X
I004/076 X X X X X X X X
I004/100 O O O O O O O O
I004/110 X X X X X O O O
I004/120 M M O X X M M M
I004/170 M M M M M O O O
I004/171 M M M X M O X X
I004/RE O O M O O O O O

item 041 042 043 044 097 098 099
I004/000 M M M M M M M
I004/010 M M M M M M M
I004/015 O O O O O O O
I004/020 M M M M M M M
I004/030 M M M M M M M
I004/035 X X X O X X X
I004/040 M M M M M M M
I004/045 O O O O O O O
I004/060 X X X X X X X
I004/070 X X X X O O O
I004/074 X X X X X X X
I004/075 X X X X X X X
I004/076 X X X X X X X
I004/100 O M M M O O O
I004/110 O O O O O O O
I004/120 M O X X O O O
I004/170 O O O O O O O
I004/171 X X X X X X X
I004/RE O O O O M O O

I004/010 - Data Source Identifier

Definition: Identification of the Safety Nets server sending the message.

Structure:

I004/010/SAC - System Area Code

I004/010/SIC - System Identification Code

Note:

I004/015 - SDPS Identifier

Definition: Identification of the SDPS providing data to the safety nets server.

Structure:

Repetitive item, repetition factor 8 bits.

I004/015/SAC - System Area Code

I004/015/SIC - System Identification Code

Note:

- The up-to-date list of SACs is published on the EUROCONTROL Web Site (http://www.eurocontrol.int/asterix).

I004/020 - Time of Message

Definition: Absolute time stamping of the message in the form of elapsed time since last midnight

Structure:

I004/030 - Track Number 1

Definition: Identification of a track number related to conflict

Structure:

Notes:

  1. This is the track number of the first track involved in the conflict in case of an STCA or a RIMCA or the track involved in case of one of the other Safety Net functions.
  2. This track number is distributed in this field exactly as it was received from the Radar Processor Unit (identified by I004/015) and its range is depending on the range used by that unit.
  3. In case of Message Type = 33 (Final Target Distance Indicator - FTD) this represents the Track Number of the following aircraft.
  4. In case of Message Type = 34 (Initial Target Distance Indicator - ITD this represents the Track Number of the following aircraft.
  5. In case of Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this represents the track number of the following aircraft.
  6. In case of Message Type = 37 (Catch-Up Warning - CUW) this represents the track number of the following aircraft (i.e. the one catching up).

I004/035 - Track Number 2

Definition: Together with I004/030, this item defines the track pair in conflict.

Structure:

Notes:

  1. This is the track number of the second track involved in the conflict in case of an STCA, a RIMCA, a NTCA, a VCD or in message types 33 to 35 and 37.
  2. For the other Safety Net functions, this item is not used.
  3. This track number is distributed in this field exactly as it was received from the Radar Processor Unit and its range is depending on the range used by that unit.
  4. In case of Message Type = 33 (Final Target Distance Indicator - FTD) this represents the Track Number of the leading aircraft
  5. In case of Message Type = 34 (Initial Target Distance Indicator - ITD this represents the Track Number of the leading aircraft.
  6. In case of Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this represents the track number of the leading aircraft.
  7. In case of Message Type = 37 (Catch-Up Warning - CUW) this represents the track number of the leading aircraft.
  8. In case of Message Type = 38 (Conflicting ATC Clearances - CATC) this represents the track number of the aircraft to which the first ATC Clearance was issued.

I004/040 - Alert Identifier

Definition: Identification of an alert (Alert number)

Structure:

Notes:

  1. This item is the Alert Identification of the conflict in the system
  2. This number shall be assigned, by the Safety Net Server, for instance incrementally to every new alert and restart on zero after reaching the maximum value (65535)

I004/045 - Alert Status

Definition: Information concerning status of the alert

Structure:

I004/045/(spare)

I004/045/STAT - Status of the Alert

I004/045/(spare)

I004/060 - Safety Net Function and System Status

Definition: Status of the Safety Nets functions handled by the system

Structure:

Extended item.

I004/060/MRVA

I004/060/RAMLD

I004/060/RAMHD

I004/060/MSAW

I004/060/APW

I004/060/CLAM

I004/060/STCA

(FX)

I004/060/APM

I004/060/RIMCA

I004/060/ACASRA

I004/060/NTCA

I004/060/DG

I004/060/OF

I004/060/OL

(FX)

I004/060/AIW

I004/060/PAIW

I004/060/OCAT

I004/060/SAM

I004/060/VCD

I004/060/CHAM

I004/060/DSAM

(FX)

I004/060/DBPSMARR

I004/060/DBPSMDEP

I004/060/DBPSMTL

I004/060/VRAMCRM

I004/060/VRAMVTM

I004/060/VRAMVRM

I004/060/HAMHD

(FX)

I004/060/HAMRD

I004/060/HAMVD

I004/060/HVI

I004/060/LTW

I004/060/VPM

I004/060/TTA

I004/060/CRA

(FX)

I004/060/ASM

I004/060/IAVM

I004/060/FTD

I004/060/ITD

I004/060/IIA

I004/060/SQW

I004/060/CUW

(FX)

I004/060/CATC

I004/060/NOCLR

I004/060/NOMOV

I004/060/NOH

I004/060/WRTY

I004/060/STOCC

I004/060/ONGOING

(FX)

Notes:

  1. This item only sent in “alive messages” to describe the status of the Safety Net functions, handled by the system
  2. Value 0 means either that the function is not managed by the system or has failed.
  3. Value 1 means that the function is managed by the system and is running well
  4. “Overflow” is defined as a situation where the number of alerts in the system has exceeded the threshold for safe operation. Potential prioritization of the alerts may lead to a loss of information.
  5. “Overload” is defined as a system status in which the number of alerts does not allow for a reliable performance. A correct calculation and transmission cannot be guaranteed.
  6. “System degraded” means that information from one or more sensors is lost.

I004/070 - Conflict Timing and Separation

Definition: Information on Timing and Aircraft Separation

Structure:

Compound item (FX)

I004/070/TC - Time to Conflict

Time remaining to actual conflict situation

I004/070/TCA - Time to Closest Approach

Time to closest proximity between entities in conflict

I004/070/CHS - Current Horizontal Separation

Current horizontal separation

I004/070/MHS - Estimated Minimum Horizontal Separation

Estimated minimum horizontal separation.

I004/070/CVS - Current Vertical Separation

Current vertical separation

I004/070/MVS - Estimated Minimum Vertical Separation

Estimated Minimum Vertical Separation

I004/074 - Longitudinal Deviation

Definition: Longitudinal deviation for Route Adherence Monitoring, in two’s complement.

Structure:

Note:
  • Longitudinal deviation will be positive if the aircraft is ahead of its planned position. Longitudinal deviation will be negative if the aircraft is behind its planned position.

I004/075 - Transversal Distance Deviation

Definition: Transversal distance deviation for Route Adherence Monitoring, in two’s complement.

Structure:

Note:
  • Deviation to the right of the track will be coded as a positive value. Deviation to the left of the track will be coded as a negative value

I004/076 - Vertical Deviation

Definition: Vertical Deviation from planned altitude, in two’s complement

Structure:

Note:
  • Positive value if aircraft is above planned altitude Negative value if aircraft is below planned altitude

I004/100 - Area Definition

Definition: Name of the area involved in a Safety Net alarm

Structure:

Compound item (FX)

I004/100/AN - Area Name

Name of the area involved in a Safety Net alarm. Characters 1-8 (coded on 6 bits each) defining the name of the area. Coding rules are provided in [3]Section 3.1.2.9”

I004/100/CAN - Crossing Area Name

Name of Crossing Area Involved in RIMCA. Each octet is an ASCII character defining the name of the crossing area involved in a runway/taxiway crossing alert (message type 013)

I004/100/RT1 - Runway/Taxiway Designator 1

Designator of Runway/Taxiway 1 Involved in a RIMCA Each octet is an ASCII character defining the runway designator

I004/100/RT2 - Runway/Taxiway Designator 2

Designator of Runway/Taxiway 2 Involved in a RIMCA Each octet is an ASCII character defining the runway designator

I004/100/SB - Stop Bar Designator

Designator of Stop-Bar Involved in RIMCA Each octet is an ASCII character defining the stop-bar involved in a stop-bar crossed alert (message type 016)

I004/100/G - Gate Designator

Gate Designator (in 7 characters) of the approaching aircraft in a RIMCA or a STOCC message, Each octet is an ASCII character defining the gate for the approaching aircraft

Notes:

  1. The area name is always left adjusted. If needed, the remaining characters are filled with space character.
  2. The name of the crossing area is always left adjusted. If needed, the remaining characters are filled with space characters.
  3. The runway designator is always left adjusted. If needed, the remaining characters are filled with space characters. The runway is encoded as follows: Location indicator, runway direction, left or right. Example: EGLL09L means London Heathrow (EGLL), Runway 09 (direction 090 degrees) left runway
  4. The runway designator is always left adjusted. If needed, the remaining characters are filled with space characters. The runway is encoded as follows: Location indicator, runway direction, left or right. Example: EGLL09L means London Heathrow (EGLL), Runway 09 (direction 090 degrees) left runway
  5. The stop-bar designator is always left adjusted. If needed, the remaining characters are filled with space characters.
  6. The gate designator is always left adjusted. If needed, the remaining characters are filled with space character.

I004/110 - FDPS Sector Control Identification

Definition: Identification of a list of FDPS Sector Control Positions in charge of the involved targets, as provided by the FDPS

Structure:

Repetitive item, repetition factor 8 bits.

I004/110/CEN

Centre identification code

I004/110/POS

Control position identification code

Note:
  • The Centre identification code and the Control position identification code must be defined between the communication partners.

I004/120 - Conflict Characteristics

Definition: Description of the Conflict Properties

Structure:

Compound item (FX)

I004/120/CN - Conflict Nature

Nature of the conflict expressed by a set of properties

Extended item.

I004/120/CN/MAS - Conflict Location in Military Airspace

  • 1 bit [.]

  • values:

    0: Conflict not predicted to occur in military airspace
    1: Conflict predicted to occur in military airspace

I004/120/CN/CAS - Conflict Location in Civil Airspace

  • 1 bit [.]

  • values:

    0: Conflict not predicted to occur in civil airspace
    1: Conflict predicted to occur in civil airspace

I004/120/CN/FLD - Fast Lateral Divergence

  • 1 bit [.]

  • values:

    0: Aircraft are not fast diverging laterally at current time
    1: Aircraft are fast diverging laterally at current time

I004/120/CN/FVD - Fast Vertical Divergence

  • 1 bit [.]

  • values:

    0: Aircraft are not fast diverging vertically at current time
    1: Aircraft are fast diverging vertically at current time

I004/120/CN/TYPE - Type of Separation Infringement

  • 1 bit [.]

  • values:

    0: Minor separation infringement
    1: Major separation infringement

I004/120/CN/CROSS - Crossing Test

  • 1 bit [.]

  • values:

    0: Aircraft have not crossed at starting time of conflict
    1: Aircraft have crossed at starting time of conflict

I004/120/CN/DIV - Divergence Test

  • 1 bit [.]

  • values:

    0: Aircraft are not diverging at starting time of conflict
    1: Aircraft are diverging at starting time of conflict

(FX)

  • extension bit

    0: End of data item
    1: Extension into next extent

I004/120/CN/RRC - Runway/Runway Crossing in RIMCAS

  • 1 bit [.]

  • values:

    0: Default
    1: Runway/Runway Crossing

I004/120/CN/RTC - Runway/Taxiway Crossing in RIMCAS

  • 1 bit [.]

  • values:

    0: Default
    1: Runway/Taxiway Crossing

I004/120/CN/MRVA

  • 1 bit [.]

  • values:

    0: Default
    1: Msg Type 4 (MSAW) indicates MRVA

I004/120/CN/VRAMCRM

  • 1 bit [.]

  • values:

    0: Default
    1: Msg Type 25 (VRAM) indicates CRM

I004/120/CN/VRAMVRM

  • 1 bit [.]

  • values:

    0: Default
    1: Msg Type 25 (VRAM) indicates VRM

I004/120/CN/VRAMVTM

  • 1 bit [.]

  • values:

    0: Default
    1: Msg Type 25 (VRAM) indicates VTM

I004/120/CN/HAMHD

  • 1 bit [.]

  • values:

    0: Default
    1: Msg Type 29 (HAM) indicates HD

(FX)

  • extension bit

    0: End of data item
    1: Extension into next extent

I004/120/CN/HAMRD

  • 1 bit [.]

  • values:

    0: Default
    1: Msg Type 29 (HAM) indicates RD

I004/120/CN/HAMVD

  • 1 bit [.]

  • values:

    0: Default
    1: Msg Type 29 (HAM) indicates VD

I004/120/CN/DBPSMARR

  • 1 bit [.]

  • values:

    0: Default
    1: Msg Type 20 (DBPSM) indicates ARR

I004/120/CN/DBPSMDEP

  • 1 bit [.]

  • values:

    0: Default
    1: Msg Type 20 (DBPSM) indicates DEP

I004/120/CN/DBPSMTL

  • 1 bit [.]

  • values:

    0: Default
    1: Msg Type 20 (DBPSM) indicates above TL

I004/120/CN/AIW

  • 1 bit [.]

  • values:

    0: Default
    1: Msg Type 99 (AIW) indicates pAIW Alert

I004/120/CN/(spare)

  • 1 bit [.]

(FX)

  • extension bit

    0: End of data item
    1: Extension into next extent

I004/120/CC - Conflict Classification

Severity classification of the conflict

I004/120/CC/TID - Identification of Conflict Categories Definition Table

  • 4 bits [....]
  • raw value

I004/120/CC/CPC - Conflict Properties Class

  • Depends on the value of (000, 120/CC/TID).
  • In case of (000, 120/CC/TID) == (5, 1):

    • 3 bits [...]

    • values:

      0: APW Low Severity
      1: APW Medium Severity
      2: APW High Severity
  • In case of (000, 120/CC/TID) == (7, 0):

    • 3 bits [...]

    • values:

      1: Major seperation infringement and not (crossed and diverging)
      2: Minor seperation infringement and not (crossed and diverging)
      3: Major seperation infringement and (crossed and diverging)
      4: Minor seperation infringement and (crossed and diverging)
  • In case of (000, 120/CC/TID) == (7, 1):

    I004/120/CC/CPC/LPF - Linear Prediction Filter

    • 1 bit [.]

    • values:

      0: Filter not set
      1: Filter set

    I004/120/CC/CPC/CPF - Current Proximity Filter

    • 1 bit [.]

    • values:

      0: Filter not set
      1: Filter set

    I004/120/CC/CPC/MHF - Manoeuvre Hazard Filter

    • 1 bit [.]

    • values:

      0: Filter not set
      1: Filter set
  • In case of (000, 120/CC/TID) == (9, 2):

    I004/120/CC/CPC/RAS - RIMCAS Alert Stage

    • 1 bit [.]

    • values:

      0: Stage One Alert
      1: Stage Two Alert

    I004/120/CC/CPC/(spare)

    • 2 bits [..]
  • In case of (000, 120/CC/TID) == (10, 2):

    I004/120/CC/CPC/RAS - RIMCAS Alert Stage

    • 1 bit [.]

    • values:

      0: Stage One Alert
      1: Stage Two Alert

    I004/120/CC/CPC/(spare)

    • 2 bits [..]
  • In case of (000, 120/CC/TID) == (11, 2):

    I004/120/CC/CPC/RAS - RIMCAS Alert Stage

    • 1 bit [.]

    • values:

      0: Stage One Alert
      1: Stage Two Alert

    I004/120/CC/CPC/(spare)

    • 2 bits [..]
  • In case of (000, 120/CC/TID) == (12, 2):

    I004/120/CC/CPC/RAS - RIMCAS Alert Stage

    • 1 bit [.]

    • values:

      0: Stage One Alert
      1: Stage Two Alert

    I004/120/CC/CPC/(spare)

    • 2 bits [..]
  • In case of (000, 120/CC/TID) == (13, 2):

    I004/120/CC/CPC/RAS - RIMCAS Alert Stage

    • 1 bit [.]

    • values:

      0: Stage One Alert
      1: Stage Two Alert

    I004/120/CC/CPC/(spare)

    • 2 bits [..]
  • In case of (000, 120/CC/TID) == (14, 2):

    I004/120/CC/CPC/RAS - RIMCAS Alert Stage

    • 1 bit [.]

    • values:

      0: Stage One Alert
      1: Stage Two Alert

    I004/120/CC/CPC/(spare)

    • 2 bits [..]
  • In case of (000, 120/CC/TID) == (15, 2):

    I004/120/CC/CPC/RAS - RIMCAS Alert Stage

    • 1 bit [.]

    • values:

      0: Stage One Alert
      1: Stage Two Alert

    I004/120/CC/CPC/(spare)

    • 2 bits [..]
  • In case of (000, 120/CC/TID) == (16, 2):

    I004/120/CC/CPC/RAS - RIMCAS Alert Stage

    • 1 bit [.]

    • values:

      0: Stage One Alert
      1: Stage Two Alert

    I004/120/CC/CPC/(spare)

    • 2 bits [..]
  • In case of (000, 120/CC/TID) == (15, 1):

    • 3 bits [...]

    • values:

      0: 2 aircraft, same taxiway, opposite direction
      1: Aircraft entering wrong direction
      2: Aircraft entering wrong taxiway
      3: Speed violation
  • In case of (000, 120/CC/TID) == (24, 1):

    • 3 bits [...]

    • values:

      0: VRM Slow Climb
      1: VRM Slow Descent
  • In case of (000, 120/CC/TID) == (24, 2):

    • 3 bits [...]

    • values:

      0: VTM Fast Climb
      1: VTM Fast Descent
  • In case of (000, 120/CC/TID) == (26, 1):

    • 3 bits [...]

    • values:

      0: Vertical manoeuvre deviation prior to reaching its expected level
      1: Vertical manoeuvre deviation past its expected level
  • In case of (000, 120/CC/TID) == (27, 1):

    • 3 bits [...]

    • values:

      0: Slow Descent
      1: Fast Descent
      2: Slow Climb
      3: Fast Climb
  • In case of (000, 120/CC/TID) == (27, 2):

    • 3 bits [...]

    • values:

      0: Above
      1: Below
  • In case of (000, 120/CC/TID) == (33, 1):

    • 3 bits [...]

    • values:

      0: Table - Single RWY Operation
      1: MRS - Single RWY Operation
      2: ROT - Single RWY Operation
      3: GAP - Single RWY Operation
      4: Table - Parallel RWY Operation
      5: MRS - Parallel RWY Operation
      6: ROT - Parallel RWY Operation
      7: GAP - Parallel RWY Operation
  • In case of (000, 120/CC/TID) == (34, 1):

    • 3 bits [...]

    • values:

      0: Table - Single RWY Operation
      1: MRS - Single RWY Operation
      2: ROT - Single RWY Operation
      3: GAP - Single RWY Operation
      4: Table - Parallel RWY Operation
      5: MRS - Parallel RWY Operation
      6: ROT - Parallel RWY Operation
      7: GAP - Parallel RWY Operation
  • In case of (000, 120/CC/TID) == (35, 1):

    • 3 bits [...]

    • values:

      0: End of Alert
      1: Planned Alert
      2: Alert on TABLE Indicator
      3: Alert on MRS Indicator
      4: Alert on ROT Indicator
      5: Alert on GAP Indicator
  • In case of (000, 120/CC/TID) == (38, 0):

    • 3 bits [...]

    • values:

      0: Line-Up vs. Line-Up
      1: Line-Up vs. Cross or Enter
      2: Line-Up vs. Take-Off
      3: Line-Up vs. Landing
  • In case of (000, 120/CC/TID) == (38, 1):

    • 3 bits [...]

    • values:

      0: Cross or Enter vs. Line-Up
      1: Cross or Enter vs. Cross or Enter
      2: Cross or Enter vs. Take-Off
      3: Cross or Enter vs. Landing
  • In case of (000, 120/CC/TID) == (38, 2):

    • 3 bits [...]

    • values:

      0: Take-Off vs. Line-Up
      1: Take-Off vs. Cross or Enter
      2: Take-Off vs. Take-Off
      3: Take-Off vs. Landing
  • In case of (000, 120/CC/TID) == (38, 3):

    • 3 bits [...]

    • values:

      0: Landing vs. Line-Up
      1: Landing vs. Cross or Enter
      2: Landing vs. Take-Off
      3: Landing vs. Landing
  • In case of (000, 120/CC/TID) == (38, 4):

    • 3 bits [...]

    • values:

      0: Push-Back vs. Push-Back
      1: Push-Back vs. Taxi
  • In case of (000, 120/CC/TID) == (38, 5):

    • 3 bits [...]

    • values:

      0: Taxi vs. Push-Back
      1: TAxi vs. Taxi
  • In case of (000, 120/CC/TID) == (39, 1):

    • 3 bits [...]

    • values:

      0: No Push-Back Clearance
      1: No Taxi Clearance
      2: No Line-Up Clearance
      3: No Crossing Clearance
      4: No Enter Clearance
      5: No Take-Off Clearance
      6: Landing Clearance
  • In case of (000, 120/CC/TID) == (40, 1):

    • 3 bits [...]

    • values:

      0: After Push-Back Clearance
      1: After Taxi Clearance
      2: After Line-Up Clearance
      3: After Crossing Clearance
      4: After Enter Clearance
      5: After Take-Off Clearance
      6: Stationary on Runway
      7: Stationary on Taxiway
  • In case of (000, 120/CC/TID) == (41, 1):

    • 3 bits [...]

    • values:

      0: No contact (receiving ATSU)
      1: No transfer (leaving ATSU)
  • Default:
    • 3 bits [...]
    • raw value

I004/120/CC/CS - Conflict Severity

  • 1 bit [.]

  • values:

    0: LOW
    1: HIGH

I004/120/CP - Conflict Probability

Probability of the conflict

I004/120/CD - Conflict Duration

The duration of the conflict is the elapsed time since the declaration of the conflict.

Note:

If no Table Id is defined for a message type, only the value of the CS bit may be of relevance. In that case, for this message type, Table Id and Conflict Properties are meaningless and shall be set to “0000” and “000” respectively. 1. Additional conflict classes may be defined by introducing additional properties of a conflict. 2. For FTD (Message Type = 033), ITD (Message Type = 034) and IIA (Message Type = 035) the following types of separation have been applied: Table: application of the values contained in the separation table according to the different wake vortex categories of the two aircraft. MRS: Minimum Radar Separation for the arrival runway ROT: Runway Occupancy Time – separation to achieve a specific ROT. GAP: separation based on a gap manually input by the ATCO

I004/170 - Aircraft Identification and Characteristics 1

Definition: Identification & Characteristics of Aircraft 1 Involved in the Conflict.

Structure:

Compound item (FX)

I004/170/AI1 - Aircraft Identifier (in 7 Characters) of Aircraft 1 Involved in the Conflict

I004/170/M31 - Mode 3/A Code Aircraft 1

I004/170/M31/(spare)

  • 4 bits [....]

I004/170/M31/MODE3A - Mode-3/A Code (Converted Into Octal Representation) of Aircraft 1 Involved in the Conflict

  • 12 bits [............]
  • Octal string (3-bits per digit)

I004/170/CPW - Predicted Conflict Position Target 1 in WGS-84 Coordinates

I004/170/CPW/LAT - In WGS-84 in Two’s Complement

  • 32 bits [................................]
  • signed quantity
  • unit: “°”
  • LSB = 180/225 °  ≈ 5.36e − 6 °
  • value  >  =  − 90 °
  • value  <  = 90 °

I004/170/CPW/LON - In WGS-84 in Two’s Complement

  • 32 bits [................................]
  • signed quantity
  • unit: “°”
  • LSB = 180/225 °  ≈ 5.36e − 6 °
  • value  >  =  − 180 °
  • value  < 180 °

I004/170/CPW/ALT - Altitude of Predicted Conflict

  • 16 bits [................]
  • signed quantity
  • unit: “ft”
  • LSB = 25 ft
  • value  >  =  − 1500 ft
  • value  <  = 150000 ft

I004/170/CPC - Predicted Conflict Position for the Aircraft 1 Involved in the Conflict

I004/170/CPC/X - Starting X-position of the Conflict

  • 24 bits [........................]
  • signed quantity
  • unit: “m”
  • LSB = 1/2 m  ≈ 0.50 m

I004/170/CPC/Y - Starting Y-position of the Conflict

  • 24 bits [........................]
  • signed quantity
  • unit: “m”
  • LSB = 1/2 m  ≈ 0.50 m

I004/170/CPC/Z - Starting Z-position of the Conflict

  • 16 bits [................]
  • signed quantity
  • unit: “ft”
  • LSB = 25 ft
  • value  >  =  − 1500 ft
  • value  <  = 150000 ft

I004/170/TT1 - Time to Runway Threshold for First Approaching Aircraft in a RIMCA

I004/170/DT1 - Distance to Runway Threshold for Aircraft 1 Involved in a RIMCA

I004/170/AC1 - Characteristics of Aircraft 1 Involved in the Conflict

Extended item.

I004/170/AC1/GATOAT - Identification of Conflict Categories Definition Table

  • 2 bits [..]

  • values:

    0: Unknown
    1: General Air Traffic
    2: Operational Air Traffic
    3: Not applicable

I004/170/AC1/FR1FR2 - Flight Rules

  • 2 bits [..]

  • values:

    0: Instrument Flight Rules
    1: Visual Flight rules
    2: Not applicable
    3: Controlled Visual Flight Rules

I004/170/AC1/RVSM

  • 2 bits [..]

  • values:

    0: Unknown
    1: Approved
    2: Exempt
    3: Not Approved

I004/170/AC1/HPR

  • 1 bit [.]

  • values:

    0: Normal Priority Flight
    1: High Priority Flight

(FX)

  • extension bit

    0: End of data item
    1: Extension into next extent

I004/170/AC1/CDM - Climbing/Descending Mode

  • 2 bits [..]

  • values:

    0: Maintaining
    1: Climbing
    2: Descending
    3: Invalid

I004/170/AC1/PRI

  • 1 bit [.]

  • values:

    0: Non primary target
    1: Primary target

I004/170/AC1/GV

  • 1 bit [.]

  • values:

    0: Default
    1: Ground Vehicle

I004/170/AC1/(spare)

  • 3 bits [...]

(FX)

  • extension bit

    0: End of data item
    1: Extension into next extent

I004/170/MS1 - Aircraft Identification Downloaded from Aircraft 1 Involved in the Conflict If Equipped with a Mode-S Transponder

I004/170/FP1 - Number of the Flight Plan Correlated to Aircraft 1 Involved in the Conflict

I004/170/FP1/(spare)

  • 5 bits [.....]

I004/170/FP1/NBR

  • 27 bits [...........................]
  • unsigned quantity
  • LSB = 1
  • value  >  = 0
  • value  <  = 99999999

I004/170/CF1 - Cleared Flight Level for Aircraft 1 Involved in the Conflict

Notes:

  1. The aircraft identifier is always left adjusted. If needed, the remaining characters are filled with space character.
  2. For Message Type = 33 (Final Target Distance Indicator - FTD) this contains the aircraft identifier of the following aircraft.
  3. For Message Type = 34 (Initial Target Distance Indicator - ITD) this contains the aircraft identifier of the following aircraft.
  4. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the aircraft identifier of the following aircraft.
  5. For Message Type = 37 (Catch-Up Warning - CUW) this contains the aircraft identifier of the following aircraft (i.e. the one catching up).
  6. For Message Type = 33 (Final Target Distance Indicator - FTD) this contains the Mode 3/A Code of the following aircraft.
  7. For Message Type = 34 (Initial Target Distance Indicator - ITD) this contains the Mode 3/A Code of the following aircraft.
  8. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the Mode 3/A Code of the following aircraft.
  9. For Message Type = 37 (Catch-Up Warning - CUW) this contains the Mode 3/A code of the following aircraft (i.e. the one catching up).
  10. Altitude expressed in two’s complement.
  11. For Message Type = 33 (Final Target Distance Indicator - FTD) this data item contains the position (in WGS-84) of the Separation Indicator presented to the ATCO. In this case bits 16/1 are meaningless.
  12. For Message Type = 34 (Initial Target Distance Indicator - ITD) this data item contains the position (in WGS-84) of the Separation Indicator presented to the ATCO. In this case bits 16/1 are meaningless.
  13. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this data item contains the position (in WGS-84) of the Separation Indicator presented to the ATCO. In this case bits 16/1 are meaningless.
  14. For Message Type = 37 (Catch-Up Warning - CUW) this contains the position (in WGS-84) of the Separation Indicator presented to the ATCO. In this case bits 16/1 are meaningless.
  15. Two’s complement fixed-point format.
  16. For Message Type = 33 (Final Target Distance Indicator - FTD) this data item contains the position (in Cartesian Coordinates) of the Separation Indicator presented to the ATCO. In this case bits 16/1 are meaningless.
  17. For Message Type = 34 (Initial Target Distance Indicator - ITD) this data item contains the position (in Cartesian Coordinates) of the Separation Indicator presented to the ATCO. In this case bits 16/1 are meaningless.
  18. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this data item contains the position (in Cartesian Coordinates) of the Separation Indicator presented to the ATCO. In this case bits 16/1 are meaningless.
  19. For Message Type = 37 (Catch-Up Warning - CUW) this data item contains the position (in Cartesian Coordinates) of the Separation Indicator presented to the ATCO. In this case bits 16/1 are meaningless.
  20. Time to Threshold expressed in Two’s Complement
  21. For Message Type = 33 (Final Target Distance Indicator - FTD) and for Message Type = 34 (Initial Target Distance Indicator - FTD) this data item contains the additional gap in spacing between two approaching aircraft as manually inserted by the ATCO. This could be used, for example, to increase the spacing between approaching aircraft in order to generate sufficient spacing to clear a departing aircraft.
  22. For Message Type = 33 (Final Target Distance Indicator - FTD) thiscontains the Aircraft Characteristics of the following aircraft.
  23. For Message Type = 34 (Initial Target Distance Indicator - FTD) this contains the Aircraft Characteristics of the following aircraft.
  24. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the Aircraft Characteristics of the following aircraft.
  25. For Message Type = 37 (Catch-Up Warning - CUW) this contains the Aircraft Characteristics of the following aircraft.
  26. For Message Type = 33 (Final Target Distance Indicator - FTD) this contains the Mode-S Identifier of the following aircraft.
  27. For Message Type = 34 (Initial Target Distance Indicator - ITD) this contains the Mode-S Identifier of the following aircraft.
  28. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the Mode-S Identifier of the following aircraft.
  29. For Message Type = 37 (Catch-Up Warning - CUW) this contains the Mode-S Identifier of the following aircraft.
  30. For Message Type = 33 (Final Target Distance Indicator - FTD) this contains the Flight Plan Number of the following aircraft.
  31. For Message Type = 34 (Initial Target Distance Indicator - ITD) this contains the Flight Plan Number of the following aircraft.
  32. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the Flight Plan Number of the following aircraft.
  33. For Message Type = 37 (Catch-Up Warning - CUW) this contains the Flight Plan Number of the following aircraft.
  34. For Message Type = 33 (Final Target Distance Indicator - FTD) this contains the Cleared Flight Level of the following aircraft.
  35. For Message Type = 34 (Initial Target Distance Indicator - ITD) this contains the Cleared Flight Level of the following aircraft.
  36. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the Cleared Flight Level of the following aircraft.
  37. For Message Type = 37 (Catch-Up Warning - CUW) this contains the Cleared Flight Level of the following aircraft.

I004/171 - Aircraft Identification and Characteristics 2

Definition: Identification & Characteristics of Aircraft 2 Involved in the Conflict.

Structure:

Compound item (FX)

I004/171/AI2 - Aircraft Identifier (in 7 Characters) of Aircraft 2 Involved in the Conflict

I004/171/M32 - Mode 3/A Code Aircraft 2

I004/171/M32/(spare)

  • 4 bits [....]

I004/171/M32/MODE3A - Mode-3/A Code (Converted Into Octal Representation) of Aircraft 2 Involved in the Conflict

  • 12 bits [............]
  • Octal string (3-bits per digit)

I004/171/CPW - Predicted Conflict Position Target 2 in WGS-84 Coordinates

I004/171/CPW/LAT - In WGS-84 in Two’s Complement

  • 32 bits [................................]
  • signed quantity
  • unit: “°”
  • LSB = 180/225 °  ≈ 5.36e − 6 °
  • value  >  =  − 90 °
  • value  <  = 90 °

I004/171/CPW/LON - In WGS-84 in Two’s Complement

  • 32 bits [................................]
  • signed quantity
  • unit: “°”
  • LSB = 180/225 °  ≈ 5.36e − 6 °
  • value  >  =  − 180 °
  • value  < 180 °

I004/171/CPW/ALT - Altitude of Predicted Conflict

  • 16 bits [................]
  • signed quantity
  • unit: “ft”
  • LSB = 25 ft
  • value  >  =  − 1500 ft
  • value  <  = 150000 ft

I004/171/CPL - Predicted Conflict Position for the Aircraft 2 Involved in the Conflict

I004/171/CPL/X - Starting X-position of the Conflict

  • 24 bits [........................]
  • signed quantity
  • unit: “m”
  • LSB = 1/2 m  ≈ 0.50 m

I004/171/CPL/Y - Starting Y-position of the Conflict

  • 24 bits [........................]
  • signed quantity
  • unit: “m”
  • LSB = 1/2 m  ≈ 0.50 m

I004/171/CPL/Z - Starting Z-position of the Conflict

  • 16 bits [................]
  • signed quantity
  • unit: “ft”
  • LSB = 25 ft
  • value  >  =  − 1500 ft
  • value  <  = 150000 ft

I004/171/TT2 - Time to Runway Threshold for Second Approaching Aircraft in a RIMCA

I004/171/DT2 - Distance to Runway Threshold for Aircraft 2 Involved in a RIMCA

I004/171/AC2 - Characteristics of Aircraft 2 Involved in the Conflict

Extended item.

I004/171/AC2/GATOAT - Identification of Conflict Categories Definition Table

  • 2 bits [..]

  • values:

    0: Unknown
    1: General Air Traffic
    2: Operational Air Traffic
    3: Not applicable

I004/171/AC2/FR1FR2 - Flight Rules

  • 2 bits [..]

  • values:

    0: Instrument Flight Rules
    1: Visual Flight rules
    2: Not applicable
    3: Controlled Visual Flight Rules

I004/171/AC2/RVSM

  • 2 bits [..]

  • values:

    0: Unknown
    1: Approved
    2: Exempt
    3: Not Approved

I004/171/AC2/HPR

  • 1 bit [.]

  • values:

    0: Normal Priority Flight
    1: High Priority Flight

(FX)

  • extension bit

    0: End of data item
    1: Extension into next extent

I004/171/AC2/CDM - Climbing/Descending Mode

  • 2 bits [..]

  • values:

    0: Maintaining
    1: Climbing
    2: Descending
    3: Invalid

I004/171/AC2/PRI

  • 1 bit [.]

  • values:

    0: Non primary target
    1: Primary target

I004/171/AC2/GV

  • 1 bit [.]

  • values:

    0: Default
    1: Ground Vehicle

I004/171/AC2/(spare)

  • 3 bits [...]

(FX)

  • extension bit

    0: End of data item
    1: Extension into next extent

I004/171/MS2 - Aircraft Identification Downloaded From Aircraft 2 Involved in the Conflict If Eequipped With a Mode-S Transponder

I004/171/FP2 - Number of the Flight Plan Correlated to Aircraft 2 Involved in the Conflict

I004/171/FP2/(spare)

  • 5 bits [.....]

I004/171/FP2/NBR

  • 27 bits [...........................]
  • unsigned quantity
  • LSB = 1
  • value  >  = 0
  • value  <  = 99999999

I004/171/CF2 - Cleared Flight Level for Aircraft 2 Involved in the Conflict

Notes:

  1. The aircraft identifier is always left adjusted. If needed, the remaining characters are filled with space character.
  2. For Message Type = 33 (Final Target Distance Indicator - FTD) this contains the aircraft identifier of the leading aircraft.
  3. For Message Type = 34 (Initial Target Distance Indicator - ITD) this contains the aircraft identifier of the leading aircraft.
  4. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the aircraft identifier of the leading aircraft.
  5. For Message Type = 37 (Catch-Up Warning - CUW) this contains the aircraft identifier of the leading aircraft.
  6. For Message Type = 33 (Final Target Distance Indicator - FTD) this contains the Mode 3/A Code of the leading aircraft.
  7. For Message Type = 34 (Initial Target Distance Indicator - ITD) this contains the Mode 3/A Code of the leading aircraft.
  8. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the Mode 3/A Code of the leading aircraft.
  9. For Message Type = 37 (Catch-Up Warning - CUW) this contains the Mode 3/A code of the leading aircraft.
  10. Altitude expressed in two’s complement.
  11. FTwo’s complement.
  12. Time to Threshold expressed in Two’s Complement
  13. For Message Type = 33 (Final Target Distance Indicator - FTD) this contains the Aircraft Characteristics of the leading aircraft.
  14. For Message Type = 34 (Initial Target Distance Indicator - ITD) this contains the Aircraft Characteristics of the leading aircraft.
  15. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the Aircraft Characteristics of the leading aircraft.
  16. For Message Type = 37 (Catch-Up Warning - CUW) this contains the Aircraft Characteristics of the leading aircraft.
  17. For Message Type = 33 (Final Target Distance Indicator - FTD) this contains the Mode-S Identifier of the leading aircraft.
  18. For Message Type = 34 (Initial Target Distance Indicator - ITD) this contains the Mode-S Identifier of the leading aircraft.
  19. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the Mode-S Identifier of the leading aircraft.
  20. For Message Type = 37 (Catch-Up Warning - CUW) this contains the Mode-S Identifier of the leading aircraft.
  21. For Message Type = 33 (Final Target Distance Indicator - FTD) this contains the Flight Plan Number of the leading aircraft.
  22. For Message Type = 34 (Initial Target Distance Indicator - ITD) this contains the Flight Plan Number of the leading aircraft.
  23. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the Flight Plan Number of the leading aircraft.
  24. For Message Type = 37 (Catch-Up Warning - CUW) this contains the Flight Plan Number of the leading aircraft.
  25. The value shall be within the range described by ICAO Annex 10
  26. For Message Type = 33 (Final Target Distance Indicator - FTD) this contains the Cleared Flight Level of the leading aircraft.
  27. For Message Type = 34 (Initial Target Distance Indicator - ITD) thiscontains the Cleared Flight Level of the leading aircraft.
  28. For Message Type = 35 (Wake Vortex Indicator Infringement Alert - IIA) this contains the Cleared Flight Level of the leading aircraft.
  29. For Message Type = 37 (Catch-Up Warning - CUW) this contains the Cleared Flight Level of the leading aircraft.

I004/RE - Reserved Expansion Field

Definition: Expansion

Structure:

Explicit item (RE)

I004/SP - Special Purpose Field

Definition: Special Purpose Field

Structure:

Explicit item (SP)

User Application Profile for Category 004