Hi FlightDetent!
Thanks a lot for your great post! Yes, I had to read it 10 times to understand it! Yes, lot's of questions, like - I am sure- you had expected!
Well, this is what I have understood:
- When you are at level and you decrease the speed, if it reaches alpha protection, the plane will pitch down to get back speed.
QUESTIONS AT LEVEL
1) At which speed will it fly? The upper limit of Alpha protection?
2) But what if you had entered a speed in the FCU, and that speed was bellow VLS, will the plane maintain that speed or the alpha protection one?
3) The plane will go down, but what happens if you had your altitude managed?
4)Will "that" speed be managed by pitch?
- When you pull your stick, the plane will reach Alpha max, but Alpha floor will give max TOGA, till we leave the stick where alpha protection will pitch down and maintain the upper speed of alpha protection.
QUESTIONS GOING UP:
1) If we have climbed, I imagine that our altitude was not managed, or not even selected (open climb), the altitude function has disconnected, am I right? If yes, no questions about altitude!
1) Same question, will it maintain that speed by pitch?
2) What if we had entered a speed in the FCU? Will it still fly that one?
QUESTIONS WITH AN EXAMPLE
We are flying A320 and here are our waypoints:
-AGOPA: FL80- 220 knots
-LORNI: FL60- 210 knots
-MOPAR: FL50- 205 knots
-MANOX: FL30- 180 knots
We are at AGOPA, FL80 entered in the FCU, speed managed.
We forget do enter FL29 managed in the FCU, speed reaches 185 knots, and hits alpha protection and pitch goes down to regain speed...
1) At which speed will the plane fly?
2) Will it then leave our managed speed? Or still try to reach it?
3) At which altitude will it stabilize? Will it leave the managed altitude?
EXTRA QUESTIONS
I just would like a approximative number for these questions: (A320- A330)
1) What is generally a take-off angle?
2) A climb angle?
3) A cruise angle?
See what I read!
"Pitch during descent is only slighty negative e.g. at low altitude (e.g. 5000ft) at 64500kgs and 250kts the rate of descent is 1660ft/min which results in a pitch attitude of -0.6deg
At 214kts (approx green dot) the pitch attitude is +2.3deg during an idle descent!"
4) A descent angle?
5) After green dot angle?
6) Rotation altitude?
EXTRA QUESTIONS PART 2
1) Why during take-off the Alpha protection and alpha max is equal for 5 seconds?
QUESTION WITH A SADLY CRASH:
1) Why did AF447 stall? Didn't alpha floor react? Or was it too late?
Thanks a lot Flight Detent!
Thanks to clear me on these questions (very important for me!)...
With my kind regards,
AF330