“JAR/FAR 1.1 : 'Critical Engine' means the engine whose failure would most
adversely affect the performance or handling qualities of an aircraft”, i.e. an outer engine on a four engine aircraft.
From AI GTG W/ PERFORMANCE book.
Note the
i.e. at the last sentence.
( i.e. <> " this is... ". and NO other ref. to twin jets is made ).
Hope it helps.
