ATC Safety Net

The most obvious and essential ATC tool is a working radio. Imagine an airport is fogged in, with hard IMC and essentially zero visibility. The tower controller cant see the airplanes. However, using a single radio with his knowledge of the airport layout, and accurate position reports from pilots moving around in the soup, he can still work the traffic. Radar controllers can also rely on pilot position reports to separate traffic in non-radar operations. Again, all they need is a radio and knowledge of their surroundings to build a mental traffic picture.

tkarmer

Monday, October 28, 2019 at 12:00 AM ET

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Key Takeaways:

Modern aviation, including Air Traffic Control (ATC), is built on extensive redundancy—from aircraft systems to ground operations—to prevent single points of failure and ensure safety, a lesson tragically reinforced by events like the Boeing 737 MAX accidents.
ATC facilities employ multiple layers of backup for critical functions: radio communications (e.g., main/standby transmitters, bypass jacks, portable radios), inter-facility coordination (e.g., multiple landlines, manual dialing, commercial phones), and power supply (e.g., battery banks, diesel generators).
Aircraft tracking also features comprehensive redundancy, utilizing various radar systems (terminal, long-range), ADS-B data, and non-radar procedures; ultimately, human ingenuity, teamwork, and manual workarounds by controllers form a vital final backup layer to maintain service and safety during technical failures.

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Modern aviation is awash in redundancies. Look at any airliner today. Each is powered by at least two engines, each with enough power to keep the aircraft aloft if one fails. Its hydraulic and flight computer systems have backups in case one is compromised. Up front are two crewmembers, each qualified to fly the aircraft in the event one becomes incapacitated.

This expected redundancy makes it all the more striking when we encounter a single point of failure that brings everything—literally—crashing down. The Boeing 737 MAX Lion Air and Ethiopian Airlines accidents that lead to that type’s grounding were shocking, not just for their loss of life, but the revelation of a single, fragile failure point.