Here’s the text to the listening from yesterday.
An old A320, was performing a standard approach to its destination. Another plane, a 737 was performing a standard departure from the same airport, at the same time. During these two procedures, the aircraft lost the necessary separation, which reduced to 500 feet vertically and 1nm horizontally, however during this time neither aircraft received a TCAS advisory. The ATC was monitoring the situation and both planes continued without incident. Further investigation revealed that the A320 had been very high on approach which caused the loss of minimum separation required.