PPRuNe Forums - What does the 'Bus FD actually *do*?

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FirmamentFX

5th Oct 2006 01:36

What does the 'Bus FD actually *do*?

Hi everyone,

What is the point of the Flight Director on the Airbus? As far as I can tell it simply generates guidance commands which are then sent to the PFD. Am I missing something deeper...?

Cheers,

Martin

WindSheer

5th Oct 2006 20:37

Hi,
The flight director on the 'bus' is the same as most other a/c.
Ie. The flight directors position is commanded by whatever mode is in use, Heading select/Alt, or the FMGS (FMC on the Boeing) giving both horizontal and vertical commands.
If the autopilot is in, it will follow the FD bars, if not then the Pilot Flying manually follows them!
Cheers!!

FirmamentFX

5th Oct 2006 20:41

Many thanks WindShear!

Martin

Superpilot

6th Oct 2006 09:19

Quote:

As far as I can tell it simply generates guidance commands which are then sent to the PFD. Am I missing something deeper...?

You're not missing anything at all, perhaps not appreciating it? ;)

FirmamentFX

6th Oct 2006 13:07

Quote:

Originally Posted by Superpilot (Post 2892138)

You're not missing anything at all, perhaps not appreciating it? ;)

:p

Thanks for the info. It just seems odd that it needs an entire subsystem to do that. I would have thought the DMC/EFIS would have handled it.

Cheers!

Martin

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