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Old 03-18-2015 | 04:39 PM
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AF330
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Default A320 Protections - G Load

Good evening,

*The normal law protects the aircraft throughout the flight envelope, as follows :
‐ load factor limitation
‐ pitch attitude protection
‐ high-angle-of-attack (AOA) protection
‐ high-speed protection.

The side-stick commands a g load request.

*LOAD FACTOR LIMITATION
The load factor is automatically limited to:
+2.5 g to -1 g for clean configuration.
+2 g to 0 for other configurations.

PITCH ATTITUDE PROTECTION
Pitch attitude is limited to :
‐ 30 ° nose up in conf 0 to 3 (progressively reduced to 25 ° at low speed).
‐ 25 ° nose up in conf FULL (progressively reduced to 20 ° at low speed).
‐ 15 ° nose down (indicated by green symbols “=” on the PFD’s pitch scale).
The flight director bars disappear from the PFD when the pitch attitude exceeds 25 ° up or 13 ° down. They return to the display when the pitch angle returns to the region between 22 ° up and 10 ° down.

Ok so we are in configuration 0.
I pull the side-stick FULL AFT. I am basically demanding 2.5g
So the plane will reach 2.5g but I know that trim stops at 1.3g

Now comes Pitch Angle Protection. Can anyone explain what happens next to our G load? How does the plane react? What about trim?*

Let's say that High AoA protections are not available for the moment....

Thanks a lot,
A.Roy
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