Originally Posted by
RUMBEAR
FCOM says to set STD at transition altitude. Are you saying you want to set it early just so you can callout a FL display on the PFD?
What happens if ATC amend the climb instruction to level off below transition due traffic and you have STD already set ?
There is a school of thought that one should set QNH during descent as soon as one is given an altitude not at transition. A number of airlines follow this procedure.