With the transfer pumps running, when you turn them off, how long does it take for the cautions to come on?
Apparently...........................
MONITORING
The electrical circuits of the transfer pumps are monitored.
In case of a defective pump, a dry running pump, or a switched off pump,
caution indication is displayed at the CPDS MISC field.
- F PUMP AFT
- F PUMP FWD
The pumps are monitored via a shunt. When the power consumption is
higher than 5 Amps (blocked pump), or longer than
~3 min lower than 2 Amps
(dry running pump), the caution will be triggered.
Another word of caution - where you have a situation as evident in this incident.
If there had been enough time to correct the situation by recovering the fuel in the main tank
to the supply tanks by turning on the F PUMP AFT and F PUMP FWD and attempt a restart, please note that in
a normal speed and attitude for autorotation (i.e. < ~80 knots) the SHED BUS would need to be switched to
EMER after a dual engine failure as the F PUMP AFT is on the SHED BB2!!
SS Sid,
Your answers to the CAD failure are listed in the RFM at 3.3.3 Failure of CAD lane.
There is a list of which cautions are subsequently passed to the VEMD screen.
XFER and PRIME pumps are NOT listed.