Shouldn't happen but everyone can make a mistake.
On my first night circuit in a Wessex 5 helicopter some 30 years ago, we suffered a hydraulic failure, a "land asap, running landing" emergency.
I called "(Callsign) Wessex, PAN PAN PAN, hydraulic failure downwind, request priority running landing on the runway" (rather than a hover landing on the normal helicopter T night landing spots inside the runway) .
ATC said: "Stand by - I have a simulated engine failure joining shortly".
My instructor said on the radio: "He didn't say "
Practice PAN.....it's a real one".
ATC: Oh, er...Ooops sorry, clear land on the runway.
(So I did and the hydraulic fluid melted the new tarmac they'd just had laid).
From the RAF's finest ATC school
