A320 autopilot disengage

[N380UA]

Hi all
I’ve been told that the Airbus autopilot will disengage on auto land when the angel is greater than 3.15°, so how do you fly a CAT I approach in auto land config.? Is there any merit to it and if so, why this limitation?
Cheers

[52049er]

Cant see that written anywhere in the tech manuals. Where did you hear that?

[N380UA]

Heard that from some 320 drivers on the continent. I tried to find something to that regard in the books but with no avail. I only have Boeing experience hence my Q..

[RadarContact]

What angle are you referring to here?

3.15° sounds like Glide Path...but that has nothing to do with CAT I capability, so I'm a little confused about the question...

[N380UA]

RadarContact

The problem was a CAT I approach with a 3.5° GP angel. Now some 320 drivers said that it would not be possible under auto land as the max angel which the ship can handle is 3.15°, which struck me somewhat awkward. Apparently the MD11 shows similar restrictions.

[320DRIVER]

I don't think the autopilot would disengage per se but it is a limitation in the FCOM not to use GP with an angle of more than 3.15 deg. Possibly has to do with the flare mode algorithm and I am sure it is common to many other aircraft.

[sandhu]

3.15 is glideslope limation as per FCOM for autoland but i have done autoland at much higher angles though in cat 1 met conditions without any disconection of autopilot, but the flare is pretty prounced.
sandhu

[N380UA]

A great many thanks to all. Your info helped me out a lot.
cheers

[HOMER SIMPSONS LOVECHILD]

Sandhu,is it a limitation for autoland operation or for LVP operation? If it is the former(as per Boeing)then you should not be conducting an autoland, regardless of the met conditions!

[sandhu]

Homer

Hye HOMER
You are right but this a new limitation introduced about a year back and autolands mentioned were carried out on earlier dates but the crux of the matter is that NO THE AUTOPILOT DOES NOT DISENGAGE.
regards
sandhu