Interim Policy 2514

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Interim Policy 25-14

• ADEQUACY of FEEDBACK
• François Fabre
• Centre d Essais en Vol

JAA HF Seminar 19-20 November 2002
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Special Condition

• If novel features are present, the team should
  raise a Special Condition as follow
• a) The design of the integrated Flight Deck
  Interface must adequately address the foreseeable
  performance, capability and limitations of the
  Flight Crew
• b) More specifically the Authority must be
  satisfied with the following aspects of the
  Flight Deck Interface Design

JAA HF Seminar 19-20 November 2002
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Special Condition

• iv) the adequacy of feedback, including clear
  and unambiguous
• presentation of information
• representation of system condition by display of
  system status
• indication of failure cases, including aircraft
  status
• indication when crew input is not accepted or
  followed by the system
• indication of prolonged or severe compensatory
  action by a system when such action could
  adversely affect aircraft safety

JAA HF Seminar 19-20 November 2002
4
Novel Feature/ Novel Concept

• INT/POL/25/14
• Novel Concept
• The term novel concept may cover a modification
  which alters the manner of working of a crew, and
  may or may not be associated with a new
  technology. It is most commonly apparent in the
  use of increased automation to relieve crews of
  tasks and/or monitoring functions for which they
  had been previously responsible.

JAA HF Seminar 19-20 November 2002
5
Presentation of Information

• Feedback are visual or audio, (potentially
  tactile).
• Objectives
• to acknowledge the crew command
• to get attention
• to orientate the understanding of the new
  situation / problem
• to orientate the adequate crew action
• to help the understanding of the new status of
  the aircraft after crew intervention

JAA HF Seminar 19-20 November 2002
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Presentation of Information

• To be clear and unambiguous
• Location, wording, colour coding and time delay
• to get attention, the alert needs to be adequate
  in level (warning, caution, advisory, message
  (1322)) and on time
• the additional given information needs to allow a
  diagnostic which
• is appropriate to standard crew knowledge
  (training)
• includes urgency and severity level
• minimises crew error ( side of the failure L/R,
  ) critical data needs to be very salient,
  wording of message clear in isolation and in
  relation with other potential messages or cockpit
  data ( semantic and phonetic distance) .

JAA HF Seminar 19-20 November 2002
7
Presentation of Information

• To be clear and unambiguous, the feedback
• may mandate or propose a corrective path of
  action
• Procedures, check-lists
• If nothing is proposed
• nothing to do by the crew it is clear for the
  crew that there is no safety concern (crew
  awareness)
• it is sufficiently intuitive, and the crew has
  sufficiently good information to make the
  appropriate corrective action in a timely manner
  ( not intercept heading/ format error)

JAA HF Seminar 19-20 November 2002
8
System and Aircraft Status

• Normal case
• autoflight, mode annunciation (1329)
• other systems
• reminders (APU running, Engine anti-ice)
• representation of system functioning (as fuel
  transfer). Symbology and colour coding are key
  elements .
• Anticipation of a degradation.
• Abnormal
• correlation between the system display and the
  system control panel
• distinguishing between the failure and the
  consequences of the failure (impacted system)
• reduction in the operational capability
• Reminder for new limitations and procedures for
  next flight phases

JAA HF Seminar 19-20 November 2002
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Crew input not accepted/followed

• Some examples
• FMS entry deletion of take off speed after
  parameter modification
• speed protection in V/S mode,
• VNAV approach not captured
• auto disengagement of a mode and reversion to a
  lower mode state
• activation of the direct to in the FMS while in
  heading mode
• FMS constraint entered by the crew and not met
• The interface should indicate when the crew input
  will not be accepted or followed

JAA HF Seminar 19-20 November 2002
10
Compensatory Action by a System

• Indication of prolonged or severe compensatory
  action by a system when such action could
  adversely affect aircraft safety
• Automation as automatic system reconfiguration
  may hide to the crew that the system is
  compensating for a severe malfunction.

JAA HF Seminar 19-20 November 2002
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Adequacy of feedback

• Is a key issue for the aircraft safety.
• In showing compliance with the above sub
  paragraph, the applicant should declare his
  design philosophy for
• crew alerting and prioritisation.
• Colour coding
• automation principles
• system feedback to crew
• and present a HF certification plan showing for
  the identified novel feature how adequacy of
  feedback will be addressed.
• sample of end users
• resources (mock-ups, simulators)
• scenarios

JAA HF Seminar 19-20 November 2002
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Adequacy of feedback

• Thank you !

JAA HF Seminar 19-20 November 2002