One example of a flow sequence would be as follows:
When configuring for an approach it is usually standard practice to slow down to below VFE then call for the first flap selection say 15 or 20 degrees, whatever is fitted. You would then call for gear down, and when below the next flap limit speed call for the final flap setting for landing, say 25-35, again whatever you have.
If you wanted to break this standard flow sequence, say bring the gear down first to get the speed off as you are too high/too fast to get the flaps in first, you might call "non-standard - gear down" as an acknowledgement that the call you have just made is out of the normal sequence.
This is just good crew resource management. Otherwise, people would call for flaps/gear in whatever order they fancied, fly whatever speed they fancied and the other pilot would be totally out of the loop. With these standard calls and sequences, any captain should be able to fly with any first officer without ever having met each other before that flight, and all go to plan.
Last edited by RTN11; 21st Nov 2012 at 20:55.