I was barely taught to use speed brakes, and v/s etc on TR, and now on line I see a lot of captains playing around with v/s which is very new to me.
I understand that you shouldn't or wouldn rather not use v/s to increase rate of descent that often, because it could increase speed a lot, but you would rather use speed brakes, correct?
If finding yourself below profile, use it to reduce rate of descent, and it will continue to maintain speed with no problems?
Can you use speed brakes and v/s both together?
ATC asked you to descent at 2500 ft per minute and maintain 250 knots.
What happens if you speed select 250 and put v/s 2500?
I assume the v/s is the priority and speed is disregarded? In this case do you use speed brakes to slow down?
The general answer is, "Use what you need to make the airplane do what you want."
Use V/S whenever you want to maintain a specific V/S. Also use it to get down to G/S when intercepting from above.
Speedbrakes + V/S is a useful combination when you want to slow down while descending at a constant rate. If airspeed starts increasing when the throttles hit the idle stop in V/S, use the speedbrakes as necessary.
In the 744, V/S will sacrifice airspeed to maintain the selected V/S; there is no speed protection at the high or low end in V/S.