John Galban wrote:
Ross Richardson wrote in message ...
snip

I do remember there was some outcry. Just about
the same time transponders were mandated.



Ross,

Where were transponders mandated in the 70's? I remember that the
expanded number of TCAs (Class B) and Mode/C requirements showed up in
the late 80's / early 90s as a result of the Cerritos mid-air crash in
'86. Before that, most planes that I flew weren't equipped with
transponders.

Just Curious.

Originally, there were Group I, Group II, and Group III TCA's (actually
they defined Group III, but there were no actual Group III TCA's established).
Group I required Mode C, Group II required just a transponder. I learned
outside of DEN, so we had transponders, but no mode C (Group II TCA) in
the late 70's/early eighties. Everything else was a TRSA and voluntary.

Cerritos was 1986, and of course the aircraft involved:
1. Was in the TCA illegally
2. The TCA bust was due to the pilot being incapacitated.

Of course, the FAA solution was to make the TCA's bigger and add ARSA's.
They also mandated mode C for many more locations (All TCA's, 30 miles
of TCA's, ARSA's, above 10,000 etc...)