The ADS-B Mess

For the time being, a Mode C transponder is your key to regularly accessing Class A, Class B, TFR and ADIZ airspace. Under most circumstances, losing altitude squawk capability means ATC isnt going to let you into those places, although you can continue flying elsewhere. Thats one reason many operators have installed a second, back-up Mode C transponder, in case the primary box fails. But that Mode C transponder is destined to be supplemented by-maybe replaced by-the FAAs new air-traffic surveillance system, ADS-B, or automatic dependent surveillance-broadcast. As plans currently stand, well all need this technology installed in our aircraft to access various airspace types by 2020, when the FAAs final rule mandates the latest and greatest ATC system, NextGen, is implemented. Putting aside the new systems relative merits and implementation timetable, the time will come when at least ADS-B Out equipment will be required for a lot of places we want to go.

Key Takeaways:

• By 2020, ADS-B Out equipment will be mandatory for accessing various airspace types, replacing or supplementing current Mode C transponders to enhance air traffic surveillance with continuous broadcast of aircraft data.
• Meeting the ADS-B Out mandate requires an integrated system of a broadcast unit, a precise position source (e.g., WAAS GPS), and an altitude source. A key challenge is that failure of any single component can lead to grounding the aircraft.
• The most fault-tolerant solutions involve self-contained systems with their own independent position and altitude sources, reducing reliance on other avionics. The article suggests waiting for more integrated and robust solutions expected before the mandate deadline.

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