JB, looking on another site, (aeroinside.com) this provides instances of aircraft issues each 24 hours. One I was just looking at was an A380 - Dubai to Manchester(UK) into 23R - 3048M. The crew had to go around at 1300 feet because the FMS advised the runway was too short for landing. After one further attempt, the crew entered a hold at 8000 feet, and I suppose checked their figures? then tried another approach, this time on 23L - 3050M, the FMS at 1100 feet advised the runway wasagain too short. The crew gave up, diverted to London and landed ok on Heathrow's runway 27L - 3660M. After a 2 hour layover at Heathrow, departed again for Manchester and completed a landing at runway 23R on its first approach.
When you input landing details in the FMS while en-route, hopefully you and the FMS would have already determined that Manchester 23R @ 3048M was sufficient when considering all the usual suspects, and the FMS indicated no errors?
Do Flight crews still do the maths in their heads before FMS entry(which I would hope) or does the FMS advise you which of the runways is appropriate considering the conditions, and you accept it? my size aircraft never had anything like an FMS, so I always did my own sums.
Why would the FMS decide to 'change its mind' when so close to landing - three times it seems, when it had plenty of opportunity earlier, with a lot less stress on every one?
If you had already done the maths and confirmed with the Airbus manuals? a runway was suitable, but the FMS disagreed, Can you land anyway, knowing the FMS has lost its way for whatever reason? I suppose, if fuel was an issue, you may have no choice.
I presumed the A380 did a cold start in London, thus rebooting the computer systems, which may have 'fixed' the FMS issue for marginal runways.