Mayday or Pan Pan
is it required to give a Mayday or PanPan call in case of the following situations?
1) Single Engine failure on a twin engine aircraft (for eg. A320) on ground during takeoff roll and aircraft stopped on the runway (no runway excursion)
2) Single Engine failure in a twin engine aircraft (A320) in air but no fire?
As per my understanding in the case of (1) neither Mayday or Pan Pan is required as neither there is distress nor urgency.
In case of engine failure in air it is Pan Pan unless engine filre will lead to a forced landing or ditching or ejection in case of aircraft equipped with ejection seats.
I have seen many instructors insisting on Mayday call.