CL44: (RR Tyne 515 mk. 12) start sequence 2 then 1. With 2 & 1 running in low ground idle, accelerate into high ground idle. When stable, generators (via CSDs) cabin supercharger (#2 and #3) on line and then same process for 3 & 4. As a result, some time would elapse after 2 & 1 were started before starting 3 & 4 could begin.
Air turBine starters powered only by a ground air start unit- not from the pneumatic manifold.
Max weight take-off one fine morning from Mombasa, with 2 & 1 running the ground crew disconnected the air start and cleared off. By the time it was brought back, the temp had risen too high to allow take-off. Back to the hotel until early evening when the temperature hsd dropped!