A320: Loss of G+B System

[Speedwinner]

Hello fellows,

quick one: on the G+B loss Ecam says: do not use Speedbrake. I know why, but do they really deploy when you pull it or do we get a caution and nothing happens?

Thanks

SW

[vilas]

Originally Posted by Speedwinner

Hello fellows,

quick one: on the G+B loss Ecam says: do not use Speedbrake. I know why, but do they really deploy when you pull it or do we get a caution and nothing happens?

Thanks

SW

With G+B fail speed brake 2&4 is available and deploy if used. That's why.

[Sim25]

No, speedbrake is inhibited, if the lever is moved nothing happens...

Hope I could help

Simon

[CHAPARRAL]

Hi Simon, sorry you’re not correct.
From FCOM DISC-27-10-20 “Speedbrake extension is inhibited, if one of the following occurs:
- SEC1and SEC3 both are faulty, or
- An elevator (L or R) is faulty, or
- Angle-of-attack protection is faulty, or
- Flaps are in configuration FULL, or
- Thrust levers are above MCT position, or
- Alpha Floor is activated.”
Cheers.

[Sim25]

When GB is lost you end in single elevator operation

[Speedwinner]

yes I know. Tried it in the sim. There’s a speedbrake fault, it does not extend

Originally Posted by vilas

With G+B fail speed brake 2&4 is available and deploy if used. That's why.

[Sim25]

Originally Posted by Speedwinner

yes I know. Tried it in the sim. There’s a speedbrake fault, it does not extend

Just out of curiosity: Next time you are in the sim, try the following (if they let you): G-B fail, as you already did and then switch off ELAC2. SEC becomes active on elevator and then try again deploying the Speedbrakes.

Cheers

[Speedwinner]

And then it will extend? So airbus is covering the case that the sec takes over control?

[vilas]

Originally Posted by Speedwinner

And then it will extend? So airbus is covering the case that the sec takes over control?

G+B fail both ailerons are lost so spoilers 2&4 are only flight controls for bank. So may they are inhibited as speed brakes or don't deploy if you are banking.

[Speedwinner]

Got that. But why do they write „do not use“ into the status?

[Sim25]

Originally Posted by Speedwinner

And then it will extend? So airbus is covering the case that the sec takes over control?

I would then expect spoiler 2 to follow the order and spoiler 4 stays inhibited. That’s most likely why the ecam memo/fault whatever is generated…