Am not sure whether this topic should be under General, if not in the right category it can be moved to the right category.
As the topic stipulates, i would like to understand the real meaning of this instruction/command, why is it issued to pilots, when is it issued. Once it’s issued, how should one respond to the ATC? Bearing in mind that you are midflight either descending or departing, what are you supposed to check for amd when?
I have heard a number of pilots being told to check the user guide for assistance, immediately thereafter atc would respond with the correct instruction.
An example of this would be during departure, when Centre is present, a pilot would check in and thereafter request a flight following. Some ATC’ would first respond with that instruction before responding with the right instruction.
I always wonder why respond firstly with, “check user guide for assistance” thereafter respond with what was requested.
We use it so pilots can refer to the manual to see what they did incorrectly. Unfortunately, we can’t yet say what they exactly did incorrectly, but I believe that’s something that is being worked on so it explains &/or takes you to that specific thing you did wrong.