It is used in the -60F for the sonar and hoist. I suspect that the R also uses it.
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)