Don't call Mayday...
Actually I have long thought that the mayday call would be much more pithy as:
"F**K, F**K, F**K"!! Summarises the situation when the donk has quit at 100 feet quite nicely I think.
The Pan call could similarly be replaced by:
"Bugg*r, Bugg*r, Bugg*r", as it carries a degree of irritation without quite as much immediate concern as the former.
These could initially be "piloted"
in the vicinity of XXX airfield, with the intention to phase it in globally thereafter.
FBW