Need for a method of compliance

1
Need for a method of compliance

• Quantified approach
• and
• Total system approach

2
Summary

• Target Level of Safety, Safety Objective, Safety
  Requirement
• - definitions/examples
• Brief on ESARR 4
• Quantified elements
• Total Aviation System Approach

3
Definitions / Meanings (1)

• Target Level of Safety (TLS)
• A level of how far safety is to be pursued in a
  given context, assessed with reference to an
  acceptable or tolerable risk.
• TLS is also known as SAFETY MINIMUM or SAFETY
  LEVEL

4
Definitions / Meanings (2)

• Safety Objective
• A safety objective is a planned safety goal. The
  achievement of an objective may be demonstrated
  by appropriate means to be determined in
  agreement with the safety regulator.
• A safety objective is a qualitative or
  quantitative statement that defines the maximum
  frequency or probability at which a hazard can be
  expected to occur..

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Terms / Processes
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Safety Objective

• Example of Safety Objectives (RVSM)
• Hazard 1.14 Change of approval status during
  flight (downgraded). Pilot will not be able to
  control level
• The probability that an intolerable situation
  occurs because of approval status
• (downgraded due to equipment failure), and that
  the pilots are not initially able to
• control the level, shall not be greater than
  extremely improbable

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Definitions / Meanings (3)

• Safety Requirement
• A risk mitigation means, defined from the risk
  mitigation strategy, that achieves a particular
  safety objective.
• Safety requirements may take various forms,
  including organisational, operational,
  procedural, functional, performance, and
  interoperability requirements or environment
  characteristics.

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Terms / Processes
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Safety Requirement

• Examples of Safety Requirement
• Hazard 1.15 Air RX/TX unserviceable
• The Safety Objective for this hazard is as
  follows
• The probability that an intolerable situation
  occurs due to an unserviceable RX/TX shall not be
  greater than extremely remote.
• In terms of RISK (combination of severity and
  likelihood) this has been found as NOT TOLERABLE
• Mitigation means Introduction of compulsory
  reporting points at the entry and the exit of
  RVSM airspace
  - SAFETY REQUIREMENT -

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RISK Classification Matrix (example)
Not tolerable
Tolerable
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ESARR 4 - Risk Assessment and Mitigation

• Concern the use of RISK ASSESSMENT and
  MITIGATION in ATM
• - Including hazard identification
• - Quantitative risk based approach
• When introducing and/or planning changes to the
  ATM System
• - ATM System considering its Airborne and
  Ground (including spatial) components
• In this requirement , Risk Assessment
  Mitigation are being addressed adopting a total
  system approach

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ESARR 4 EATMP approach
Safety objectives

Safety requirements
System Implementation
Verification that Safety objectives and Safety
requirements are met
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Work done so far
FAILURE
HAZARD
INCIDENTOR ACCIDENT
SEVERITY OF EFFECTSINDUCED BY THE HAZARD
CLASS 1Accidents
CLASS 2SeriousIncidents
CLASS 3MajorIncidents
CLASS 4SignificantIncidents
CLASS 5No ImmediateEffect on Safety
1,55x10-8
Guidance Material for States to determine
National Risk Classification Scheme
??
??
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MAXIMUM PROBABILITYOF OCCURRENCE OF HAZARD
EFFECTS
14
Total Aviation System Approach
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Work done so far
FAILURE
HAZARD
INCIDENTOR ACCIDENT
SRC POL DOC 1 ECAC ATM Safety Minima
SEVERITY OF EFFECTSINDUCED BY THE HAZARD
CLASS 1Accidents
CLASS 2SeriousIncidents
CLASS 3MajorIncidents
CLASS 4SignificantIncidents
CLASS 5No ImmediateEffect on Safety
1,55x10-8
??
??
??
MAXIMUM PROBABILITYOF OCCURRENCE OF HAZARD
EFFECTS
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Need for a method of compliance
QUESTIONS ?

• Quantified approach
• and
• Total system approach