(Jet) Engine restart after failure.
I would like to know your opinions about which, after an engine has stopped in flight, are the (technical) conditions, in which an inflight restart could be attempted / desireable.
It is clear that after a fire or severe damage this should not be done; but what if the engine experienced 'less than severe damage'.
(in other words where would you draw the line between severe and other damage?, and what if you could not determine the exact raison of the failure...)
(Maybe some engine/aircraft manufacturers have produced guidelines for these situations ?)