I have a IO-360 with Aerosance FADEC. The Aerosance wiring shows a 2200 ohm 1/2 W resistor across the Boost Pump Relay (That coil measures 78 ohms). 14V is supplied through a Boost Pump Sw. and the low side ground is supplied by the ECUs to turn on the electric fuel pump as needed. This has worked great for 9 years but on a couple of recent flights it logged a BOOST PUMP RELAY SHORTED error that lasts about 20 minutes then goes away until the next cold start flight. So as I try to figure out what is happening I wanted to understand why the resistor is in the circuit.
It's been about sixty years since electronics school but I knew some of you will know why that resistor is in the circuit.
It's been about sixty years since electronics school but I knew some of you will know why that resistor is in the circuit.