Normal & Alternate Law Protections

Question 1

How many protections are there? And what are they?

Answer 1

5: load, high speed, bank, pitch, AoA

Question 2

What is the load protection and is it available in alternate law?

Answer 2

Yes it is. In clean config -1 to 2.5G
In other than clean 0 to 2G

Question 3

What is the high speed protection, when does it activate and what does it do?

Answer 3

When above Vmo MMO side stick nose down authority is reduced and permanent nose up order is applied.

Positive static stability = 0 (instead of 33) and bank angle limit goes from 67 to 40.

If stick is maintained forward, overshoot of speed to +16kts/+0.04M then nose down authority reduces to 0.
AP disconnect at +15/+0.04

Question 4

What is the bank angle protection?

Answer 4

Positive static stability till 33. Max bank 67. When turning more then 33 degrees back pressure required to maintain altitude.

If pitch or AoA protection is active, maximum bank is 45 degrees.

With high speed protection static stability decreases to 0 and max bank 40 degrees

Question 5

Max pitch and when do flight directors disappear? And return?

Answer 5

+30 up (+25 low speed) conf 0-3
+25 up (+20 low speed) conf full
-15 down

> 25 up or -13 down, come back at 22 and -10

Question 6

What is the high angle of attack protection?

Answer 6

Becomes active between Aprot and Amax. Full backstick gives Amax. Release bring is to AProt. A floor may activate.
Protection has highest priority.