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CARE-ASAS Activity 3: ASM Time-Based Sequencing OSED

Explore time-based sequencing operations and airspace applications in ATC systems. Understand procedures, functional characteristics, and contingency protocols.

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CARE-ASAS Activity 3: ASM Time-Based Sequencing OSED

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  1. CARE-ASAS Activity 3: ASM Time-Based Sequencing OSED CARE/ASAS Activity 3: ASM workshop Brétigny, 19 December 2001

  2. Objectives and Tasks • Objectives: • To provide relevant information for safety assessment • R&D 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 CARE/ASAS Activity 3: ASM workshop Brétigny, 19 December 2001

  3. Airspace characteristics CARE/ASAS Activity 3: ASM workshop Brétigny, 19 December 2001

  4. 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 CARE/ASAS Activity 3: ASM workshop Brétigny, 19 December 2001

  5. Time-based sequencing applications CARE/ASAS Activity 3: ASM workshop Brétigny, 19 December 2001

  6. 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 CARE/ASAS Activity 3: ASM workshop Brétigny, 19 December 2001

  7. AFR345 select target 1234 Selecting target 1234, AFR345 Target identified 1234, AFR345 WPT separation AFR345, behind target, merge to WPT to be 2min behind Merging to WPT to be 2min behind target, AFR345 DLH234 AFR345 240 40 Cancel delegation, AFR345 / 253 43 AFR345 passing waypoint / AFR345 unable delegation Merge behind CARE/ASAS Activity 3: ASM workshop Brétigny, 19 December 2001

  8. 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 CARE/ASAS Activity 3: ASM workshop Brétigny, 19 December 2001

  9. Functional characteristics ATC system • CWP equipped with marking facilities • Delegation information transferred automatically between sectors CARE/ASAS Activity 3: ASM workshop Brétigny, 19 December 2001

  10. 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 CARE/ASAS Activity 3: ASM workshop Brétigny, 19 December 2001

  11. 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). CARE/ASAS Activity 3: ASM workshop Brétigny, 19 December 2001

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