All aircraft engine fire detection systems will
provide an audible warning and have an indicating light for the relevant
engine.
The examiner is trying to confuse you! Successfully it
would seem by adding the 13653 bit. Information must be passed around the
aircraft from system to system. One way of doing this is via a 13653 data bus.
I have not seen this question before and do not
believe it is currently being used. If it were to come up I would appeal it as
knowledge of 13653 data bus systems is not currently a JAA objective.