Aviaman
Well Known Member
I am looking at an aircraft that has ECi ?group A? cylinders. The AD require a compression test each 50 hrs. The Group ?B? cylinder AD requires replacement.
My question is what defines ?group A? and ?group B? cylinders. Yes, I already know a set of serial numbers determine them, but I am not talking about that. I am asking what data caused these groups to be defined in the first place.
What was the failure data for group A? I see certain number of head separations quoted, something like 30 or so. But I never see how this is divided between the 2 groups. Anyone know any primary references ?
Thanks,
John
My question is what defines ?group A? and ?group B? cylinders. Yes, I already know a set of serial numbers determine them, but I am not talking about that. I am asking what data caused these groups to be defined in the first place.
What was the failure data for group A? I see certain number of head separations quoted, something like 30 or so. But I never see how this is divided between the 2 groups. Anyone know any primary references ?
Thanks,
John