Question -

Recent experience has shown persistent damage occurring on seating faces of main engine exhaust valves which is not confined to any particular cylinder unit.

State, with reasons, the possible causes;

State the short-term action to be taken in order to minimize engine operational problems; C. State, with reasons, how future incidents of this nature could be minimized.

Sr 7 2005/2013/SR6/2015/SR09/2018/OCT