Hi Guys
Well when the EC engineers arrived, sure enough the problem would not repeat itself
Did every checks possible under the sun and still nothing.. so went for a short flight test and still nothing upon returning..
THEN it happened during the next start... the culprit was my external home made EPS using 2 x 12V + 1 6V batteries (30V) . We made that unit 2 years ago when we could not get a 28.5V StartPac locally. It always worked up to now, mainly running Avionics during ground tests
If using the aircraft battery or the 28,5V StartPac, no issue; but when using the home made cart, the bang bang started and a very slow starter spooling up
So that's what the engineers ascertained the problem to be
