It is used in the -60F for the sonar and hoist. I suspect that the R also uses it.
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Are you guys saying you have an electrically powered hyd pump in addition to the backup hyd pump?
The simple answer is that the backup pump comes on under the 5 following circumstances:
#1 Hyd pump fail
#1 Tail rotor servo fail
#1 Hyd resevoir low
#2 Hyd pump fail
APU Accumulator low
(3 ones, a two and a poo)
That's the best memory aid I've heard for that!(3 ones, a two and a poo)