Rough engine on run-up

[AlexUM]

Hey guys,

First of all, thanks for your answers

From what I've heard after our mechanic made a first check, two cylinders have almost no compression. So it seems the valves also have suffered some damage. Can this be due to a single-time running too lean? Or must have somebody flown the aircraft consistently too lean?

This is a training aircraft flown by students every day, and this is the second time this happens in one year (!). This also makes me wonder if our CFIs should rethink their part of instruction regarding leaning.

@Fuji: You're right . There seems to be a common attitude of "If it's not mine, I don't care..." nowadays.

However, I'm still wondering what would have happened if I had attempted a take-off.


Cheers,
Alex