Tasmin,
In the realms of large/ medium twins I've only flown the 75 and 77 but I'm not sure how many are certified for a single engine autoland. I know the 75 wasn't.
The normal procedure, in the event of an engine failure is to perform a single engine, flap 20 autoland if the facilities allow. However with an immediate return (catastrophic engine failure, raging fire etc) it may preclude dumping to a weight that allows flap 20 to be used and maintain landing performance. On these days IF the landing climb limit data for flap 30 allows you then have the choice of a flap 30 autoland.
If the aircraft is not certified to single engine auto land the data may not have been collated as part of the certification process (I'm guessing here), and I can't remember if the 75 QRH had gear down ROC tables. However depending on what landing configs the aircraft is certified for it is nice to know what can and cannot be achieved with manual flight in limiting circumstances too.
In my opinion it allows more options to be considered, should time be on your side. You can always have a look at the table pre-take off on marginal runways, just in case. Being a pessimist I very often do have a look so I have the ballpark figures tucked away in the back of my head before we launch.
Only my opinion but happy to be corrected by a trainer.
Jazzy
Last edited by JazzyKex; 27th April 2012 at 08:10.
Reason: To hopefully improve clarity in my rambling!!!