The
system uses the standard EI capacitance probes and fuel level indication is very
accurate. What is happening is when we key the mike to transmit, after a few
seconds the fuel indication drops to zero. After we stop transmitting the level
returns to normal. We have used shielded wiring, antenna coax is routed down the
opposite side of the fuselage from the probe wiring, all the LRU’s in the G3X
system are centrally grounded along with everything else in the system. We have
tried everything we can think of as far as trying to isolate and shield all the
different components, but nothing works. The rest of the system works
perfectly.