A.in any emergency or if in any doubt as to what decision or measures to take
B.in the event of any impending action in machinery spaces that may cause reduction in ship’s speed
C.when isolating and bypassing machinery to be worked on
D.co-operating with any engineer in charge of maintenance work

A.the chief engineer
B.the designated engineer from shipyard
C.the designated duty officer in charge of the engineering watch
D.the designated surveyor from classification society