Originally Posted by chevvron
2 Sheds- at my unit SRG insist that if you issue a discrete transponder code to an aircraft to identify it, you MUST verify any associated mode C.
Yes, that was the point that I was making - another unit has the right to assume that the associated Mode C of a discrete code has been verified if it is not de-selected pronto.
The other point:
MATS Pt 1:
Controllers are to verify the accuracy of Mode C data, once the aircraft has been identified and the Mode A validated, by checking that the readout indicates 200 feet or less from the level reported by the pilot.
"Readout", not a rapid rough calculation because the pilot is reporting on a different subscale setting.