Hi Lou.

So that means that the L.H. Bottle Inactive Light should come on (and stay on), once you have started engine #3 on High Pressure? That would certainly make a lot of sense. I just didn't know that that is what the bottle was used for.

I have another question. What are the circumstances that would require a High Pressure start? Or. Did they refill the bottle after the end of every flight (where the engines were shut down) so it was always available for the engine start?

I'm guessing, that part of the answer would be that a High Pressure start should/would almost guarantee a successful engine start compared to a Low Pressure start.

Why is the engine start 3, 4, 1, 2? And is it always in that order?

Mark