Air Traffic Control Distance Measuring Equipment Threshold 
Pilot Institute
JUNE 19, 2025
They serve as visual aids to guide pilots, ground crew, and Air Traffic Control, indicating the boundaries and areas of different spaces of the airfield, such as runways, taxiways, holding positions, and parking areas. Non-precision runways often look similar to visual runways but feature threshold and aiming point markings.
Air Facts
MAY 7, 2025
The equipment was often not much modernized from the military days so the pilots likely hoped for good weather as they filed their flight plans. It was common practice for tower controllers to monitor the area control centre enroute frequency. It was a winter night shift in a Western Ontario air traffic control tower.
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