Yes, I know it is an erosion of separation and we must have, and adhere to, the appropriate standards in place to ensure our excellent safety record is maintained. The fact is that an extra 100 ft (vertical) separation
Except that we separate a/c using lateral separation as well. 3nms is the required separation at TC. 3nms were maintained throughout this 'terrifying airmiss.'
Guess it's a non-event then eh??
