All done, but a couple of niggly loose ends remain.
3d The way I'm parsing the wordplay would mean that "taken off" would be a reversal indicator, but is that right? I could see how an aeroplane which had just "taken off" would be "climbing" but that seems a bit tenuous.
34a I'm thinking that the "do" of the clue must match the first 3 letters of the answer. But I can't find a definition which matches both.
I had to laugh when I finally twigged 7d though – very good!