Originally Posted by
extricate
I'm still not convinced that if ATC clears you to climb above 6000, the altitude constraints are automatically cancelled. Like the rest of the threads above, there has to be some form of instructions such as "unrestricted" or "climb via SID (to comply altitude constraints)
From post #9, here is the relevant part.
Within UK airspace, for all stages of flight, instructions to climb or descend cancel any previous restrictions, unless the restrictions are reiterated as part of that instruction. Additionally, for aircraft on a SID, the word ‘now’ is added to climb clearances above the SID profile, to highlight that the SID vertical profile is no longer applicable.
eg ‘Jet 123 climb now FL 120’ means that the aircraft should climb directly to FL 120, ignoring the vertical profile of the SID.
Several other posters have also pointed out the UK procedure!