Originally Posted by
Freight Dawg
Please reread my first three sentences. The concern isn’t for Boeing guys, it’s for light aircraft. Many Cessna, Pipers, etc have very limited backups, if any. Due to the ADS-B mandate, during a GPS outage their position will only be know by primary radar. All transponder, including Mode C, functions will be inoperative.
After 2020, no reason for people to keep mode c transponders in their planes, I assume many will be removed, those that remain probably won't be serviced or ever turned on.