In those days ATC had to rely on Pilot Reports of altitude. The ARTS tracking system wasn't even operational then. Mode C wasn't required until after 1970. Low Altitude alerts weren't available until probably the mid 1970s'. Al
In those days ATC had to rely on Pilot Reports of altitude. The ARTS tracking system wasn't even operational then. Mode C wasn't required until after 1970. Low Altitude alerts weren't available until probably the mid 1970s'. Al
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