Mode S v TCAS & ALT v FLT Level
Following on from a recent "incident" I am looking for an expert to help with a couple of Mode S queries.
Traffic wrongly cleared to FL50 (should have been 5000ft) against someone else's traffic at 4000ft - low pressure = loss of separation. About 600ft on this occasion.
Mode S indicates 50 and 40 - so no way of knowing what pressure setting this relates to.
STCA went red - How did it know?
What would the respective TCAS's make of the situation?
Many thanks to anyone able to help.