Thanks PJ2...
I'm still thinking that rather than a warning as such, on legacy (crude?) system aircraft, a simple readout display, saying what state the Air/Ground system 'thinks' its in would be easy to refer to... prior to approach and land, one wouldn't want it saying 'GROUND' and vice versa prior to take-off .. doesn't matter so much whether it's working or not, but it's current 'state' is important for the crew to know?
They should be split so that the realy goes to the correct phase when it fails. i.e. when relaxed it should give RAT heating and TOWS active.
As someone said, would be nice to know why this default wasn't chosen? It might have been due to more complexity and yet another relay being required in the chain...