CARE/ASAS Activity 3: ASM workshop Br

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CARE-ASAS Activity 3 ASM Time-Based
Sequencing OSED
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Objectives and Tasks

• Objectives
• To provide relevant information for safety
  assessment
• RD work, not any implementation objectives
• Tasks
• Description of the operating environment and
  time-based sequencing operations
• Focus on operations description and higher-level
  description of CNS/ASAS functions

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Airspace characteristics
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Application characteristics

• Time-based sequencing characteristics
• Time criteria used for separation
• Airborne separation minima may be smaller than
  ATC separation minima
• Airborne separation minima may be defined either
  in time or in distance
• Controller no more provides separation between
  aircraft involved in time-based sequencing
  procedure
• Controller provides compatible navigation
  instructions/clearances to both aircraft involved
  in time-based sequencing procedure
• Controller ensures separation with surrounding
  traffic

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Time-based sequencing applications
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Procedures (1/2)

• Identification phase
• Detection of opportunity for a time-based
  sequencing procedure
• Positive identification of the target aircraft
  with identification by the controller and
  confirmation by the flight-crew
• ATC clearance delivery
• Execution phase
• Flight crew responsible for complying with the
  specific time-based sequencing clearances
• Clearance update and transfer to next sector
• Termination phase
• Normal or Abnormal end of procedure

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Merge behind
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Procedures (2/2)

• Transfer of time-based sequencing procedure
• Receiving controller informed of the incoming
  pair of aircraft
• Delegation information displayed on the CWP
  automatically transferred between sectors
• Confirmation by the flight-crew executing a
  time-based sequencing procedure of the on-going
  clearance to the receiver controller

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Functional characteristics

• ATC system
• CWP equipped with marking facilities
• Delegation information transferred automatically
  between sectors

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Functional characteristics

• Airborne system
• Surveillance function (based on ADS-B and TIS-B)
• ASAS Separation function
• Consistency check of selected target aircraft
  identification and separation (i.e. compatibility
  with respect to airborne separation minima)
• Provision of adequate information about selected
  target aircraft and for the establishment and the
  maintenance of the required separation
• Alarm in case of a predicted loss of selected
  time-based separation or airborne separation
  minima
• Adequate HMI

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Contingency procedures

• In case of flight-crew inability to perform the
  procedure
• The flight-crew interrupts the procedure and
  informs the controller about the interruption.
• The flight-crew is not authorised to deviate from
  its trajectory without controller instruction
  (except to avoid a collision risk).