Pursuant to subsection 5.9(2) of the Aeronautics Act, and after having taken into account that the exemption is both in the public interest and is not likely to adversely affect aviation safety, I hereby exempt NAV CANADA, 77 Metcalfe Street, Ottawa, Ontario K1P 5L6 from paragraph 801.08(b) of the Canadian Aviation Regulations (CARs), in respect to the introduction and use of separation minima that may be used in conjunction with MLAT technology pursuant to the requirements subsection 4.1.2 of Chapter 1, subsections 9.4.4 (b) (ii), 10.5.2 (b) and 11.5.1 of Chapter 2, sections 1.1, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 3.1, 5.1, subsections 6.1.1, 6.2.1, 6.2.2, 6.3.1, 6.3.2, 6.3.3, 6.4.1, section 7.1, subsections 8.1.1, 8.2.1 and 8.3.1 of Chapter 3 of Standard 821 – Canadian Domestic Air Traffic Control Separation Standards , subject to the conditions set out below.

Details of paragraph 801.08(b) of the CARs and relevant standards of the Canadian Domestic Air Traffic Control Separation Standards are found in Appendix A of this exemption.


This exemption allows NAV CANADA to apply some the radar separation standards specified in Appendix A using surveillance systems employing Multilateration (MLAT) technology in lieu of radar.


This exemption applies to NAV CANADA when applying separation standards using an MLAT surveillance system


This exemption is subject to the following conditions:

  1. NAV CANADA shall install, maintain and operate the MLAT system as part of the NAV CANADA Air Traffic Management System in accordance with NAV CANADA ANS Standards and Procedures documents and comply with the applicable requirements of ICAO Annex 10 Volume 4 and maintain documentation that shows how compliance is achieved.

  2. NAV CANADA shall, as a minimum, conduct preventative maintenance in accordance with the manufacturer’s recommendations.

  3. NAV CANADA shall meet the minimum performance specifications for MLAT as specified below:

    1. position accuracy: less than 304 metres for the application of 3 nautical miles separation and less than 911 metres for application of 5 nautical miles separation.

    2. probability of detection: all time gaps between two consecutive position reports in any track have to be less than 5 seconds with at least 97% probability in all applications.

    3. position update rate: 5 seconds for 3 nautical mile separation and 12 seconds for 5 nautical mile separation.

  4. NAV CANADA shall provide training to all persons who perform a function related to the installation, maintenance and operation of the MLAT system and, upon successful completion of training in the performance of that function, certify that such persons as being competent to perform such functions and maintain documentation of the personnel training and certification.

  5. NAV CANADA shall conduct an implementation safety assessment for the use of MLAT at each planned installation site and submit this safety assessment to Transport Canada, Chief, ANS Operations Oversight at least 1 month prior to implementation of the system.

  6. NAV CANADA shall publish, by appropriate means, information and guidance material for air traffic controllers and air crew concerning MLAT operations, ATC procedures, ATC phraseology, if applicable, and air crew requirements and procedures.

  7. NAV CANADA shall provide to Transport Canada, Chief, ANS Operations Oversight, the training plan including course lesson plans for operational controllers prior to the implementation of MLAT.

  8. NAV CANADA shall provide, upon request from Transport Canada, Chief, ANS Operations Oversight, a copy of documentation indicating how the above conditions are being achieved.


This exemption is effective until the earliest of the following:

  1. March 1st, 2018 at 23:59 EDT;

  2. the date on which any of the conditions set out in this exemption is breached; or

  3. the date, on which this exemption is cancelled, in writing, by the Minister of Transport where he is of the opinion that it is no longer in the public interest or that it is likely to adversely affect aviation safety.

DATED at Ottawa, Ontario, Canada this 12th day of March 2013, on behalf of the Minister of Transport.


[original signed by Aaron McCrorie for]


Martin J. Eley
Director General,
Civil Aviation


Date de modification :