One carb icing event, in a C182 (The Icemaker) at night in IMC over the border ranges tracking Coffs to TWB. Easy fixed with the carb heat but plenty of pucker in the meantime
.
One engine failure in a piston twin in day VMC, just after T/O in a fully loaded PA31; had a MAP split and loss of power on one side, managed 50 FPM at VYSE while still making some power on the dud engine - don't want to think about ROC if it had completely clagged it
Was a FCU.
One turn back just after T/O in a Kingair in day VMC, with loss of oil pressure and profuse oil leak (complete engine oil volume expelled in about 28 nanoseconds)
Was a prop governor control seal.
One gear indication failure in a C404 - a microswitch.
Two total vacuum failures: a PA32 in night VMC and a Baron in day IMC just after T/O - the PA32 was a pump failure and the Baron was a pressure controller which took out the whole pneumatic system
. Used the TC to maintain control.
One electrical fire in a C404 - a vent fan.
Two flat tyres - one an Aztec that the previous driver flat spotted and didn't say anything, just parked it with the hole on the bottom
, the other a 404 that had a rim separation while taxying.
That's about all I think. For-real engine failures seem relatively uncommon; system failures are more prevalent.