Use the DF loop meter by steering towards the crossed
needles which should then move to the centre when you
will be be steering TO the beacon [ ADF1 ].
The DF loop aerial also gives a reading from the back as
well as the front, but this reciprocal indication will
move away from the centre as you steer towards the
crossed needles. Try it out in SLEW mode.
There is no standby vacuum system, instead there is a
pump on each engine and a selector switch.