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A320 Flight Directors On Or Off?  
User currently offlineBirky From United Kingdom, joined Apr 2005, 4 posts, RR: 0
Posted (6 years 4 weeks 15 hours ago) and read 5778 times:

Perhaps you can help...?

If, as my A320 type rating instructors tell me, you are best advised to have the FDs either both ON or both OFF, why haven't Airbus designed the FD engagement procedure with just ONE pushbutton in the centre of the FCU?

Perhaps more to the point, when would you ever want to deliberately fly with one FD ON and the other OFF?

Cheers

4 replies: All unread, jump to last
 
User currently offlineWILCO737 From Greenland, joined Jun 2004, 9032 posts, RR: 75
Reply 1, posted (6 years 4 weeks 14 hours ago) and read 5771 times:
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Quoting Birky (Thread starter):
Perhaps more to the point, when would you ever want to deliberately fly with one FD ON and the other OFF?

I don't know about the airbus, but we on the MD11F has as well 2 switches for the FD. And when I switch my off, the captain leaves his on, so he can check what I am doing and cross check it with the calculated commands of the FD.

For CAT III approchaes with autoland both FD needs to be fully operational as well.

WILCO737 (MD11F)
 airplane 



It it's not Boeing, I am not going.
User currently offlineWing From Turkey, joined Oct 2000, 1571 posts, RR: 23
Reply 2, posted (6 years 3 weeks 6 days 13 hours ago) and read 5544 times:

In 737 we also used to do exactly what WILCO explains. You want to keep your skills sharp while the other pilot crosschecks.But here on The Bus the book says both FD's On and OFF at the same time.Not because it can not be used as explained above but because its airbus,everything has to be different  Smile


Widen your world
User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2556 posts, RR: 24
Reply 3, posted (6 years 3 weeks 5 days 14 hours ago) and read 5462 times:

I suppose there may be occasions where on pilot may need to switch their FD off. With AP on there is no real problem in having one FD off. The weakness in the design became clear after the Bangalore A3e20 crash. After that, caused partly by one FD being on while the other was off, the FMA annunciation for FD was modifed to show the status of the other pilot's FD as well. So although your FD is off, you can see that the other is on and so affecting the mode the autothrottle is operating in.


The glass isn't half empty, or half full, it's twice as big as it needs to be.
User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 4, posted (6 years 3 weeks 5 days 13 hours ago) and read 5450 times:



Quoting Birky (Thread starter):
If, as my A320 type rating instructors tell me, you are best advised to have the FDs either both ON or both OFF, why haven't Airbus designed the FD engagement procedure with just ONE pushbutton in the centre of the FCU?

Can't speak for all operators, but all I have been associated with have a SOP of either both on or both off. In reality, you will either have the FD on both sides, TK/FPA or the bird.


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