ASSTAR User Forum

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ASSTAR User Forum 1Rome 4th April
2006ASAS-TN2 Second Workshop ASSTAR Safety
Approach and Preliminary Issues

Dr Giuseppe GRANIERO, SICTA ggraniero_at_sicta.it
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Contents

• Objectives of the Safety analysis in ASSTAR
• Scope
• The followed approach
• Major activities
• Planned deliverables
• Current status
• Preliminary safety issues per Radar applications
• Planned activities per Oceanic applications

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Safety assessment - Objectives

• Assess Safety impact of the ASSTAR applications
• Provide early feedback to concept procedure
  under development
• Qualitative Assessment
• Quantitative Assessment
• Definition of Targets for safety quantification
• Evaluate the impact of ASSTAR results on existing
  regulations

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Scope

• Given the following application

• What is feasible within the ASSTAR timeframe
• Avoiding redo previous work?

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The Approach

• Step 1 Identification of Safety metrics
• Likelihood and Severity of hazards
• Risk Classification Scheme
• Combination of likelihood and severity to
  classify the risk
• Step 2 - Operational Description
• From previous WPs
• From other projects
• Step 3 Hazards Identifications
• Adaptation of existing OHA wherever applicable
• Description of the threat, causes and
  consequences (RTS)
• Step 4 Safety Objectives
• Step 5 Safety Scenarios

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Layered Safety Approach
Initial Hazards identification
Outstanding Issues
Preliminary Results
Areas of Interest
OCEANIC Environment
RADAR Environment
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Major Activities
SAFETY
D6.1 OHA for the Selected Applications D6.2 Oper
ational Safety Performances of the Selected
Applications
Safety Scenarios
Qualitative
ASSESSMENT
Safety Targets Target Level of Safety
Quantitative
D6.3 Regulatory Procedures
Recommendations
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Planned Deliverables

• Expected results will be collected into the
  following deliverables
• Safety Policy and Plan was circulated in December
  2005

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Current Status
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Preliminary Safety Issues - Radar

• ASSTAR Lateral Crossing Passing
• Misidentification of the target by the delegated
  aircraft
• Trajectory Prediction Uncertainty
• Pilot Controller acceptance of the ASAS
  Separation operations
• Phraseology
• Influence of the ASAS separation minimum

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Planned Activities Oceanic (1/3)

• Airborne Traffic Situation Awareness In Trail
  Procedure
• Considering that the RFG Operational Safety
  Assessment is in progress the following
  activities could be considered
• Review of existing Operational Safety Assessment
• Quantitative evaluation of the safety
  performances as appropriate
• Airborne Separation In Trail Procedure
• Considering its similarity to ATSA ITP the
  following activities could be considered
• To analyse the additional crew task to monitor
  and maintain spacing to specific aircraft during
  the execution of the manoeuvre
• To analyse the safety aspects of a sequence of
  aircraft with different performance
  characteristics

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Planned Activities Oceanic (2/3)

• Airborne Separation In Trail Follow
• To build an OHA, adapting the existing material
  to the oceanic environment
• To quantitatively assess the amount of freedom
  pilots have in changing speed during an ASEP-ITF
  manoeuvre, in terms of incident and accident
  frequencies, focussing on the predictability of
  the last aircraft in an ITF queue
• To support the definition of the numerical values
  of the airborne separation minima and spacing
  tolerance, by estimating the collision risk as
  function of those variables

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Planned Activities Oceanic (3/3)

• Free Flight on an organised track system is
  significantly different from true Free Flight,
  and some existing results can not be copied
  without considerations about these differences.
  The ASSTAR project could therefore consider the
  following activities
• To identify hazards that do not apply for
  comparable Free Flight concepts.
• To consider earlier safety recommendations in
  detail and to validate their applicability.
• To extend the modelling capabilities and to
  execute Fast Time simulations of the application
  in order to estimate the collision risk.
• In addition to that, special attention will be
  paid to the evaluation of the conflict resolution
  algorithms.

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• Thank you