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Annex C: Surveillance Criteria Table (Step 2c)

1. General

1.1 This annex provides guidance on developing the surveillance system Criteria Table(s).

2. Rationale and Guidance

2.1 As described in paragraph 4.2.2.b.(3) of the advisory, Step 2c, the surveillance system Criteria Table(s) identifies(y) the applicable criteria and means of compliance that will be used to certify the surveillance design. For example, a design change which only implements an air traffic control radar beacon system (ATCRBS) Mode S may only require one Surveillance Criteria Table. However, a design change which implements ATCRBS Mode S, as well as ADS-B Out, may require two tables (i.e., an ATCRBS Mode S Surveillance Criteria Table and an ADS-B Out Surveillance Criteria Table).

2.2 For out-of-scope projects, the Surveillance Criteria Table(s) will be submitted to the TAA for approval.  It is recommended that the table(s) be submitted with the certification plan. However, if necessary, the table(s) may be submitted at a later date.

2.3 Annex D identifies additional technical criteria that the TAA has provided to supplement the criteria associated with various surveillance system designs. The additional criteria should be included in the Surveillance Criteria Table(s), as appropriate.

2.4 The criteria in the table will be used to evaluate the surveillance system design, by using the appropriate means of compliance identified in the compliance matrix.

2.5 It is recommended that assistance with developing the Criteria Table(s) be requested from DTAES 6 engineering support staff.

2.6 The following should be considered in developing, and obtaining approval of, the Surveillance Criteria Table:

  1. Detailed table(s) is/are key to the successful certification of surveillance capability. They should be structured around the following information:
    1. the aircraft avionics components to which the approval will apply; and
    2. the operating modes of the surveillance system.
  2. The Surveillance Criteria Table should identify the certification criteria.
  3. Where any criteria have been satisfied by prior certification, and continue to be met by the design change, this may be indicated in the comments section of the Criteria Table, and a reference provided in the compliance matrix.
  4. The table should include the reasons for excluding any portions of the criteria that would otherwise be expected to apply.
  5. Generally, FAA advisory circulars use mandatory terms, such as “must”, that are only applicable when the means of compliance that the Applicant chose to follow are recommended in the AC. The AC also uses ‘non-mandatory’ terms, such as “should” or “recommended”, to identify other acceptable means of compliance that Applicants are encouraged to use, but are not mandated. The term “may” is used for optional methods.
  6. The TAA recommends that the ‘non-mandatory’ criteria be considered for inclusion in the Surveillance Criteria Table. The FAA's rationale for including non-mandatory criteria in the ACs is to provide an increased design level of safety. When a non-mandatory criterion is applied, it should be identified in the Criteria Table as ‘not mandatory.’

2.7 Example of a Surveillance Criteria Table. Table C-1 is an example of a partial ADS-B Criteria Table.

Table C-1 – Example a partial ADS-B Out Criteria Table

Alternate format

AC 20-165B Criterion number 3.1 (Title)

  • Column 2 – Criterion Text: General Installation Guidance
  • Column 3 – Compliance Technique: n/a
  • Column 4 – Compliance Notes: n/a (title only)
  • Column 5 – Results (Met/Not met)
  • Column 6 – Comments

AC 20-165B Criterion number 3.1.1

  • Column 2 – Criterion Text: Environmental Qualification.
    Ensure the environmental qualification of the installed equipment is appropriate for the aircraft, in accordance with AC 21-16G, RTCA Document DO-160 versions D, E, F, and G, “Environmental Conditions and Test Procedures for Airborne Equipment”.
  • Column 3 – Compliance Technique: Description
  • Column 4 – Compliance Notes: Engineering Inspection
  • Column 5 – Results (Met/Not met)
  • Column 6 – Comments

AC 20-165B Criterion number 3.1.2

  • Column 2 – Criterion Text: The ADS-B System Design Assurance (SDA) parameter indicates the probability of an ADS-B system malfunction causing false or misleading position information or position quality metrics to be transmitted. SDA may be preset at installation for systems that do not use multiple position sources with different design assurance levels; otherwise the system must be capable of adjusting the SDA broadcast parameter to match the position source being employed at the time of transmission.
  • Column 3 – Compliance Technique: Description, Analysis
  • Column 4 – Compliance Notes: Engineering Inspection
  • Column 5 – Results (Met/Not met)
  • Column 6 – Comments

AC 20-165B Criterion number 3.1.2.1

  • Column 2 – Criterion Text: Compliant Architecture
  • Column 3 – Compliance Technique: n/a
  • Column 4 – Compliance Notes: n/a (title only)
  • Column 5 – Results (Met/Not met)
  • Column 6 – Comments

AC 20-165B Criterion number 3.1.2.1.1

  • Column 2 – Criterion Text: ADS-B equipment that meets the minimum performance requirements of TSO-C166b or TSO-C154c, and is directly connected to a position source meeting the minimum performance requirements of any revision of the following TSOs may set the SDA = 2 without further analysis:
    • TSO-C129, Airborne Supplemental Navigation Equipment Using the Global Positioning System (GPS);[….]
  • Column 3 – Compliance Technique: Description
  • Column 4 – Compliance Notes: Engineering Inspection and Evidence of TSO Approval
  • Column 5 – Results (Met/Not met)
  • Column 6 – Comments

AC 20-165B Criterion number 3.1.2.1.2

  • Column 2 – Criterion Text: For installations in aircraft with more complex system architectures, a system safety assessment, as described below, is required to set the SDA. […]
  • Column 3 – Compliance Technique: Analysis
  • Column 4 – Compliance Notes: n/a
  • Column 5 – Results (Met/Not met)
  • Column 6 – Comments

AC 20-165B Criterion number 3.1.2.2

  • Column 2 – Criterion Text: Conducting the System Safety Assessment
  • Column 3 – Compliance Technique: Analysis
  • Column 4 – Compliance Notes: n/a (title only)
  • Column 5 – Results (Met/Not met)
  • Column 6 – Comments

Annex D of this advisory (TAA Advisory 2021-01) – Additional Technical Considerations and Interpretations, Section 2.1

  • Column 2 – Criterion Text: ADS-B Out – Continuity: The EASA continuity (loss of function) requirement for an ADS-B Out functionality is defined in CS-ACNS Issue 4 (advisory reference 3.2.2.g), as 2x10-4 /flight hour.
    The FAA requirement for continuity considers the loss of function of an ADS-B Out system to be a Minor failure condition, which equates to a continuity of 10-3/flight hour (advisory reference 3.2.2.m, Para 3.b.).
    Therefore, the TAA’s recommended ADS-B Out functionality continuity requirement is dependent on whether operations will be conducted within the USA or Europe. For aircraft where the Statement of Operating Intent (SOI) clearly indicates that operations will only ever occur within the USA a continuity requirement of 10-3/flight hour is applicable. For aircraft where the SOI indicates operations will also occur in Europe a continuity requirement of 2x10-4/flight hour is applicable. Either requirement can normally be achieved by a single ADS-B Out system.
  • Column 3 – Compliance Technique: Description
  • Column 4 – Compliance Notes: Engineering Inspection
  • Column 5 – Results (Met/Not met)
  • Column 6 – Comments

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2024-06-12