If you are flying with both transfer pumps off and absolutely no fuel in the main tank, certainly UK Police by night, you should already be approaching to land - not 2 miles away, but descending & slowing with the helipad in sight, FULL STOP.
Just a slight amendment to that;
The frf for the SPAO was 85 kgs and for NPAS ac the frf is 105 kgs.
At the point at which the main tank indicates zero, SPAO would normally have just over a minute left to be on the ground. Suffice to say that NPAS ac should not be in the air at night with the main tank empty.
I have to agree that the system isn't flawed and is not difficult to manage.
SID you still won't face the facts.
Yes I have!
Transfer pumps off, prime pumps on, supply tanks empty, main tank 76kgs, fault with CAD, warnings came on in 'expected' sequence for circumstances. No distress/urgency call, so far no indication that the crew knew of any problem.
Aircraft perfectly serviceable prior to incident, transmission stationary on impact. Nothing found in autopsy.