Hmm! Difficult to answer that. Your profile shows nothing about you. If you could tell us why you need to know perhaps we can try to answer.
If you are a pilot with an operator your SOPs should tell you?
I know that the SOP'll specify the details, when, how ect...
But I'm asking about the standard rules cause it can't be opened, should be a limit & each company will set its own SOP in accordance with standard limit.
Your profile shows nothing about you
PILOT
shortly I''ll start flying on 737-BBJ
Regards,
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always be on glidpath