In the mid 70's Blackjack arrived at Scone in a "Pig" for fuel with a load of one day old chicks bound for somewhere out west and asked if we could look at one of his engines which had low oil pressure.
On pulling the filter it was found to contain lots of "sparklies" (no part numbers tho) at which he opted to carry on saying that if the engine failed he would get his pax to all start flapping their wings.