cause the captain said
So he should be providing the proof...not you. If he ever gives a reference, I would be more than happy to have it
.
As Akrapovic said, in the UK FIRs, it is clearly defined in an AIC (ref AIC Yellow 107/2007, findable on the NATS website).
For the rest of the world, I don't recall any particular rate (other than 500').
Some FIR, TMA, CTR have special requirements but none of it can be generalized.
Colin Oskopi is right...500fpm at least for the "arrow" on everybody's display (CTL included)
