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AIRBUS New QRH (2012-RCAM) - ENG Fail (No Damage) LDG Dist calculation

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AIRBUS New QRH (2012-RCAM) - ENG Fail (No Damage) LDG Dist calculation

Old 28th Oct 2012, 17:09
  #21 (permalink)  
 
Join Date: Jul 2007
Location: Airport
Posts: 46
"The FLAPS3 selection in the MCDU is just to allow the A/THR to command Vapp iso F-speed when the approach phase is activated".

I thought that the Flap selection in the MCDU would only change the VLs in the MCDU,and the A/THR would command the Vapp shown in the MCDU. If so, then my previous question may still hold since in step 4 we have manually inserted the Vapp.

Thanks
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Old 28th Oct 2012, 18:08
  #22 (permalink)  
 
Join Date: Apr 2004
Location: United States of Europe
Age: 36
Posts: 446
"The FLAPS3 selection in the MCDU is just to allow the A/THR to command Vapp iso F-speed when the approach phase is activated".

I thought that the Flap selection in the MCDU would only change the VLs in the MCDU,and the A/THR would command the Vapp shown in the MCDU. If so, then my previous question may still hold since in step 4 we have manually inserted the Vapp.

Thanks
The Flaps3 selection in the MCDU changes the VLS and the resulting Vapp. However we donŽt care about that when applying a Vref increment, as the increment is always based on Vref (Vls CONF FULL).

The reason that we still select Flaps3 in the MCDU even when we have manually inserted a Vapp is due to the autothrust logic.

With the approach-phase activated the speed targets are as follows:
Conf0 - Green Dot
Conf1(+F) - S-speed
Conf2 - F-speed
Conf3 - F-speed *
ConfFull - Vapp target

*When we do a Flaps 3 landing weŽd like the A/THR to command Vapp tgt rather than F-speed. In order to make this happen we select Flaps3 in the MCDU even when we have manually inserted a Vapp.

Hope this clears things up.
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