Aerospace and Telecommunications Engineering Support Squadron

The Aerospace and Telecommunications Engineering Support Squadron (ATESS) provides specialised aerospace and telecommunications engineering, training and production services in support of worldwide air force operations.

Home to drafting, engineering, and workshop facilities and personnel, ATESS is a one stop-shop capable of taking a project from the idea stage through the drawing, prototyping, testing and production phases.

In addition to its Aircraft structures, avionics, NDT, IHM, and workshop capabilities, ATESS provides storage facilities for retired Aircraft fleets, is home to the CF Tool Control Centre, repairs and overhauls airfield equipment, installs airfield equipment at bases across Canada, provides expert advice on airfield equipment, maintains and designs airfield software systems, and trains personnel in NDT, IHM, hose fabrication, tool control, and airfield equipment and systems maintenance.


To be recognized as the Canadian Forces centre of expertise for operational and tactical level support to air force operations .


Through the customized application of technology, ATESS supports Canadian Forces operations by delivering quality aerospace and C4ISR capabilities safely, responsively, and cost-effectively.

Wind Turbines

In certain circumstances, wind turbines, either as single units or grouped together in a wind farm, can negatively affect navigational systems if installed within a certain distance of an aerodrome. Although wind turbines do not transmit or radiate RF signals other than the generation of background noise, they can still affect radar signals in a number of ways including shadowing, mirror-type reflections, clutter or signal scattering. The impact of a radar receiving such a signal could cause critical information about a target (i.e. aircraft) to be lost or cause the target to disappear suddenly and reappear in a different location on the screen. This impact on performance causes great concerns to flying operations in terms of safety to military and civilian personnel and aircraft. In addition, the large blades of wind turbine towers located near an airport are a hazard to low approach and low altitude flights, as well as gliders and skydiving training activities.

To avoid any potential difficulties, the following process is recommended at an early stage in the wind farm development process:

Step 1. The wind turbine project Proponent creates documentation showing:

  • Maps of the location of the proposed wind farm and all the wind turbines
  • Latitude and Longitude (NAD83 or WGS84) of each wind turbine; excel format (.xls) in Degrees / Minute / Seconds (Wind Turbine Submission Form)
  • Ground or base elevation above Mean Sea Level for each turbine
  • Height of each nacelle above ground level
  • Diameter of the rotating blades
  • Blade material
  • Local government contact; e-mail address/telephone number

Step 2. The Proponent contacts with this information to determine if there is any possibility that the proposed wind farm may impact any radar in the area.

Step 3. If it is determined that a given installation may have an impact, the Proponent and the Department of National Defence authority then undertake the necessary studies and non-regulatory mitigation measures to resolve the issue to the mutual satisfaction of both parties involved.

The determination of whether or not a proposed turbine or wind farm may create an unacceptable level of interference with existing radar is very complex and it is not possible to categorically determine if unacceptable interference will occur unless a site-specific analysis is undertaken.

Note: The process outlined above applies specifically to Department of National Defence assets.  However, civil air navigational systems are similarly affected by wind turbines and as such, proponents should contact NAV CANADA’s Land Use Department for an assessment of their systems.

Guidelines for Consultation/Impacted Areas

The table below provides general area sizes around specific equipment that would require consultation between a potential developer and the Department of National Defense.

SystemsGeneral Guidelines for Consultation Zone
Air Defence Radars
  1. 80 km (43 nm) of an Air Traffic Control (ATC) Area Search Radar (ASR);
  2. 16 km (10 nm) radius of any DND Air Traffic Control Secondary Search Radar (SSR);
  3. 40 km (22 nm) radius of any DND Precision Approach Radar (PAR);
  4. 100 km (54 nm) of an Air Defence (AD) radar;
  5. 100 km (54 nm) from the Canada – United States border;
  6. 10 km (5 nm) of a military installation; or
  7. 28 km (15 nm) radius of any DND airfield (Instrument Approach Procedures / TERPS)
Air Traffic Control Radars


Contact Details

Military Air Defence and ATC Radars:

Wind Turbines
Aerospace and Telecommunications Engineering Support Squadron
8 Wing Trenton
Box 1000 Stn Forces
ASTRA, Ontario
K0K 3W0

This contact is for technical assessment and impact on National Defence Radars only. All general public inquiries should be directed to Public Affairs.

Military Radio Communication Users:


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