IFATCA INTERNATIONAL FEDERATION OF AIR TRAFFIC CONTROLLERS ASSOCIATIONS

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IFATCAINTERNATIONAL FEDERATION OF AIR TRAFFIC
CONTROLLERS ASSOCIATIONS

• MANAGEMENT OF MIXED MODE OPERATIONS
• SRC14 28-29 May 2002

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INTRODUCTION

• ATM SYSTEM ENHANCEMENT
• to resolve Capacity Delay problems
• more cost-effective services to airlines
• NEW TECHNOLOGIES
• B-RNAV, P-RNAV,TCAS,8.33,RVSM
• ASSOCIATED EXEMPTIONS
• State, Humanitarian, Military,etc.

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THE PROBLEM

• With the increasing complexity in airspace
  necessary for Military and State a/c to operate
  as GAT. These numbers are increasing
• No evidence that hazard analysis or safety case
  has been carried out for mixed-mode operations

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JAMES REASONS MODEL

• Aviation Industry-Complex productive system
• ELEMENTS
• 1.Decision Makers
• 2.Line Management
• 3.Preconditions
• 4. Defenses
• FAILURES
• active / latent

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CONCLUSIONS

• The ATM system will continue to evolve through
  the use of technology and the number of
  exemptions, if not checked now, will increase -
  Mode S, FM Immunity, MLS, ADS, CPDLC, TDMA radios
  etc,The controller is often used as the
  mitigation to permit these to operate, however
  there is a limit to the number of pieces of
  information which can be displayed either on the
  data display or the radar to indicate these
  exemptions, and also the cognitive function of
  the controller to react to numerous triggers.
•  

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.CONCLUSIONS

• Airspaces such as the North Atlantic specify a
  Minimum Navigation Performance Specification
  thereby denying access to the core area of the
  airspace. This practice should be the norm
  rather than the exception.
• Moreover, the applicability to ATC of
  technological innovations ... has to be
  appraised, to assess their helpfulness and their
  optimum forms in relation to ATC.

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RECOMMENDATIONS

• No exemptions BUT if not applicable
• To be recognised that there is a LIMITATION to
  no. of different exemptions accommodated having
  impact on SAFETY and CAPACITY
• A full SAFETY ANALYSIS of Mixed Mode OPS should
  be conducted

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SRC14 IS INVITED

• to note IFATCA concern and policy about
  mixed-mode operations in an increasingly complex
  ATC environment
• to note IFATCA recommendations to ACG as outlined
  in section 6 of attached AP/ACG/16/13
• to note that IFATCA submitted the attached paper
  as a flimsy to ACG/16 and that the Agency
  informed that it was taking such concern very
  seriously throughout its development

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SRC14 IS INVITED

• to assess carefully the acceptability of any
  proposed exemption policy from a safety
  perspective
• to systematically verify that agreed exemption
  policy are respected at national level
• to verify, when reviewing safety arguments, that
  mitigation measures relying on ATCO (and crew)
  are demonstrated to be feasible and effective
  and in doing so, to pay a specific attention to
  other changes to ATM which would require as well
  mitigation measures relying on ATCO (and crew)."