Got a problem with my MT57. Four good flights on Sunday, started motor for #5, started OK then stopped and would not restart.

Confirmed no spark at the plug so gave up for the day. Tonight started some diagnostics, took the switches (mechanical + FO) out of the circuit to find that the plug would spark sometimes but not others. It would sometimes spark a number of times in succession then just stop. Battery checked OK and I could not find anything that would make it either work or not work.

I tried to test the Hall sensor by using my multimeter as a current meter. Read 6.4mA nornally increasing to 7.27mA when the magnet was parked near the sensor. Don't know what I should be seeing, but this was consistent and seemed to me to suggest that the sensor was OK.

As of now my conclusion is that there is an intermittant fault in the ignition module. Would welcome any advice as I am fairly new to petrol engines.

Terry