CASA’s response
The June 2012 timing represents CASA’s best assessment of the stage when TSO-C145a/146a compliant GNSS equipment will have become the basic standard provided by avionics manufacturers for GNSS equipment fitment to IFR aircraft. The timing also provides a substantial lead-in period for aircraft equipage.
Page A6 Document NFRM 0601AS
Notice of Final Rule Making
The objective that CASA sought when establishing a standard for navigation position data equipage was to provide for state-of-the- art performance levels for the availability and integrity of such data when ADS-B becomes widely used in Australian airspace for ATS separation purposes. CASA accepts the above arguments that other avionics fitments/solutions available both now and in the future may provide for similar levels of availability, continuity and integrity for ADS-B position source data. There may also be future GNSS equipment standards issued by aviation authorities that have at least equivalence to that of TSO-C145a/146a. It is for that reason CAO 20.18 together with the guidance material in Advisory Circular AC 21-45 provide the basis for CASA to assess the suitability of any other equivalent equipments/solutions, including FMS based systems that have existing GNSS equipment to TSO-C129 standard. The guidance material in AC 21-45 will list those other systems which have been accepted by CASA as having equivalence, and that listing will be kept up to date.
CASA does not consider it to be necessary or practical to include performance standards which encompass all possible means of equivalent compliance in the regulatory material. Rather, it will retain the process whereby an aircraft operator may refer to the guidance material to determine compliance, or alternatively the operator may contact CASA to apply for individual approval of other equipment or systems. That is the reason the final rule CAO includes a clause that permits CASA to accept other standards for the geographical position transmitted by the ADS-B equipment. The approach is in accordance with CASA’s regulatory development policy for non-prescriptive, outcome-based rules.
Disposition
The final rule retains the TSO-C145a/146a standard for compliance by 28 June 2012, or for CASA to approve other acceptable equipment standards; see final rule CAO 20.18 Appendix IX paragraph 2.
COMMENT 4: THE PROPOSED TECHNICAL STANDARDS FOR ADS-B AVIONICS – Certification of DO 260/DO-260A extended squitter equipment, etc.
An airline aircraft manufacturer and a private individual advised that TSO-C166 will shortly be replaced by TSO-C166a which will apply to DO-260A equipment and not DO-260 equipment. The manufacturer commented that the FAA has publicly stated that TSO-C166 is obsolete and will shortly be replaced with a revised version, TSO-C166a. However, TSO-C166a only applies to DO-260A equipment and all reference to DO-260 has been removed in the revised version. Certification of DO-260 ADS-B equipment may require CASA to reissue an appropriately modified version of TSO-C166 as an Australian TSO, or alternatively, to list compliance with another standard, such as the EASA/JAA standard to be published in early 2007. It was recommended that the NPRM be modified to include TSO-C166a in paragraph 1 of Appendix XI to CAO 24.18; and that a different more appropriate certification basis for DO-260 equipment (other than TSO-C166) be considered.
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