Hello Mars

First off sorry to hear about your Roo. I hope the damage was not too bad.

For the flame out. Just a couple of common things that I have experienced or have seen.

1. Bubbles. You will see a light Smokey trail out the back of the turbine as fuel is ejected out the back before the ECU shuts down the flow of fuel.

a. Mostly seen in a new airplane or just put in a new UAT and did not get all the air bubbles out.

b. Holes or leaking fittings. Festo type fittings on the vacuum side for instance may leek air occasionally especially after a few hours of run time. They are designed for pressure not vacuum. I have used Nylon or aluminum T fittings or brass tube on the vacuum side of the fuel system with stainless steel safety wire wrapped around the fitting for extra sealing.

2. Failsafe. Usually no smoke at all due to the ECU doing the shutdown.

a. Battery voltage too low digital servos drawing too many amps.

a. Radio interference; do a partial power range check.

Hope this helps.