IFR GPS Installation Certification

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IFR GPS InstallationCertification

• Mike Palmer

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Outline

• Topics discussed at GPS Workshop in May 2002
• TCCA position on some topics
• Discussion of each topic

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Approved Model List STC

• The AML STC will address the issue of a common,
  streamlined approach to certification for a large
  number of IFR GPS installations.
• This presentation looks at the other IFR GPS
  installations.

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Use of Specified Data

• Specified data has been used for installation of
  radios and VORs. Some IFR GPS installations may
  be installed in the same way and some can not.
  
• TCCA is investigating the criteria and process
  for the installation of IFR GPS.

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Potential Criteria for Application of IFR GPS
Streamlined Process

• Normal or VLA category airplane
• TSO C129a Class A1, A2 C146a Gamma Class 1
• GPS drives a dedicated course deviation indicator
  (CDI) in the primary field of view
• GPS can not drive a cross-side display
• GPS provides guidance to an autopilot only when
  enroute and only for lateral deviation

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Potential Criteria for Application of IFR GPS
Streamlined Process (continued)

• No installation-specific instructions are
  required in a Flight Manual Supplement
• No change is required to the Instructions for
  Continued Airworthiness

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Part 27 IFR Installations

• TCCA Position The criteria for acceptable human
  factors and autopilot interactions are
  sufficiently different between fixed- and
  rotary-wing that the recommendations of the GPS
  Working Group can not be applied to Part 27 IFR
  GPS installations. The Policy Letter will not
  include helicopters.

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TSO C146a IFR Installations

• TSO C146a equipment can support three types of
  approaches LNAV, LNAV/VNAV (APV) and APV II.
• TCCA Position The installation requirements for
  C129a equipment are appropriate for C146a Gamma
  Class 1 equipment and existing guidance supports
  certification of Gamma Class 1.

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Criteria for IFR GPS Annunciators

• The Policy Letter will define
• Criteria for the location of annunciators
• Criteria when annunciators are not required
• Criteria will presume the GPS control and display
  unit is mounted in the radio stack immediately
  adjacent to the pilots position.

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Principles for Specified Data

• Data provided by the equipment manufacturer must
  address the elements of the installation
  necessary to maintain compliance to the basis of
  certification or it can not be used as specified
  data.
• TCCA position The Policy Letter will include
  criteria to be satisfied by equipment
  installation instructions to be used as specified
  data.

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Flight Test for IFR GPS Installed to Specified
Data

• The criteria for using specified data is such
  that a simple flight test plan is sufficient.
• TCCA position Every IFR GPS must be flown to
  demonstrate proper function when installed.

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Persons Qualified to Witness Flight Test

• TCCA position The current provisions of ACPL 17
  4.10.2 will be retained. The designation of the
  individual to witness IFR evaluation flights will
  be by letter from the RMAC.

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The Size of the Box

• Balancing
• Modest steps and well-defined scope with a known
  publication date
• and
• Practical process with wide applicability but
  unknown publication date

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Discussion

• Introduce the authors of the Policy Letter
• Respond to questions about the positions taken by
  TCCA
• Work through a list of topics that we think will
  help us continue writing the Policy Letter

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List for Discussion

• Combination of Approved and Specified Data
• Compliance with Operating Regulations
• Removal of Not for IFR Limitation Data
• Oversight of AMOs Using Specified Data
• Multi-Function GPS Equipment