Atr 42-500 No Go Items

[FLEXPWR]

Back to school

No offense, but a lot is answered in the FCOM1 Ch.17.

You should have a look, the FCOC is (although briefly) explained, and on the ground with engines recently shut down, the fuel line temp indicators (not the fuel tank temperature) will rise to max value. This is normal, and further reading should make you realise it has nothing to do with a hot start... The "hot" fuel will vaporise even better on the next start.

As a rule of thumb, the max 200c residual temperature can be seen as the limit for a normal start up, where the CL goes from FSO to FTR (fuel opening) at 10% NH. If the residual temperature is higher, you have 2 options: If on GPU, there is absolutely no harm in performing a dry crank to cool off the hot section. If you are on battery, you can open the fuel at 19%, as recommended by the manufacturer.

I also have seen airlines opening at 20% NH in hot/high conditions, it works just fine.

Now about the bleeds: they are not used during the start sequence and forced closed. Only the monitoring of the bleed position is using power (lack of electricity or air pressure will also close the bleed valve), which is minimal, but the bleed Pb's need not be in the OFF position. They re-open 30 sec after the start sequence is complete.

There is however something useful to be done with the bleed valves, but it is before engine shut down. If you switch OFF the bleeds about 1 or 2 minutes before shutting down the engine, the hot section core of the engine will have a much less residual temperature, thus less turnaround time or risk of an overtemp... if your turnaround is less than 30 minutes, don't bother shutting down #2, and keep hotel mode.

Flex

PS: Chapter 7 of AFM gives a list of the MEL items that shall not be combined, otherwise they become a NOGO. Maybe that was what you were looking for?