RAT5
You raise what is a very topical issue amongst some of my colleagues as to the use of MAYDAY or PAN.
I think you will find that the diversion airfield would declare either FULL EMERGENCY, or possibly AIRCRAFT ACCIDENT IMMINENT. The actual decision would be detailed in their MATS PART TWO (local instructions).
Many moons ago I was an ACTO II with the CAA (now NATS) before leaving for BAeFC
I suspect that the external agencies were alerted and attended. Perhaps a current ATCO can update us as to the current practice.
As for the concept downgrading from MAYDAY to PAN ~ I have search for this in CAP413 and other documents without success.
Cancelling a MAYDAY ~ yes. Downgrade ~ ???
Last edited by parkfell; 17th Sep 2017 at 06:34.