Gus Cabre writes:

Affirm, exactly that. And if you are not going to collide against another
aircraft or terrain, they usually clear you to descend.

I'll try that, then. Is there any difference between "request
descent" and "request lower"? Can I be more specific, like "request
descent to cross BUBBL at 12000" (if the FMC is trying to do that)?

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