Air Traffic Management Concept Baseline Definition - The Boeing ...

3.3. Event-based trajectory deviation reporting from the aircraft could allow a
reasonable compromise between position update frequency and the need to
detect maneuvers or blunders in tightly space traffic scenarios.
3.4. Short-term conflict alerting tools for the sector controller would reduce the
probability of missed detection of true conflicts.
The improvements listed in items 1-3 above pertain primarily to the nominal system
performance enhancements that may be required to support growth through 2015.
Section 3.3.4 details the associated non-normal performance requirements from the point
of view of simultaneously maintaining or improving safety in dense terminal airspace.
3.3.3 Efficiency in Dense Terminal Airspace
It is conceivable that high throughput in terminal areas can be maintained with some room
for operators to optimize efficiency. This points to the concept of dynamic planning for
fleet and flight management, to improve individual or bank efficiency, which would be
based on the following operational improvements:
1. Hub schedule updates to maximize passenger throughput.
2. Trajectory negotiation and intent information sharing through data link.
3. Precision 4D navigation to maintain conformance with trajectory plan.
4. Precision sequencing and spacing to aid in maintaining throughput.
As discussed in more detail in Section 4, there are substantial unresolved issues regarding
the effect of trajectory flexibility and reliance on automation on human performance,
particularly in non-normal conditions. The above list therefore would need to be subjected
to substantial concept validation studies before feasibility is proven.
3.3.4 Safety in Dense Terminal Airspace
The criticality of the detection and intervention functions will lead to a requirement for
very high availability and integrity levels, as traffic spacing is reduced in dense terminal
areas. It is unlikely that the current functional and CNS architecture will be sufficient to
achieve the total system certification and commissioning criteria associated with reduced
separations, and thus the following enhancements may be required:
1. Nominal performance parameters, such as accuracy and latency, will be improved as
detailed in 3.4.2-3.
2. Establish the level of criticality through risk analysis. It is clear that safety
improvements through risk reduction with the lower separations will require higher
availability and integrity of the total system.
3. High availability of function may require independent redundancy in communication,
navigation and surveillance, and in the separation assurance function element. This
may imply independent voice and data link channels, independent navigation sources
and two independent surveillance data sources.
37