Interesting RW05,
the aircraft I had with the broken spark lead had only been serviced the week before.
Another thought, with the stresses and strains a training aircraft undergoes, heavy landings etc - (yes, I am to blame as well) how often is the airframe checked.
The wing spars must take some heavy loads on occassions so what checks are made for metal fatigue? Spark plugs, landing lights and pitot heaters I can cope with, but I doubt a successful outcome if a wing comes adrift. These are 15-20year old aircraft I am flying.
Um, I wish hadn't thought about that now!