|Quoting CptSpeaking (Reply 5):
I realize they are capable, as well as almost any other model (737, 767, A320, yada yada yada...), but are they allowed? If so, why do so may flights get diverted for low level fog or other limiting weather?
I can't think of an airline with aircraft that are certified for CATIII ops that don't use them. There is an issue of crew training and currency for sure so that could acocunt for some diverts but for the most part not to big an issue.
Most diverts at IAH
due to low vsby is due to the crew not being qualified fot CATIIIB and the RVR being less than 600'....but that just doesn't happen more than a few months out of the year.....some of it could be they get all balled up in a holding pattern with aircraft that are not CATIII able and the center for whatever reason can't get them out of it before they have no more gas to hang around.
There are other reasons for diverts such as flow rates at the airport going to hell if the fog wasn't forecast and a much lower arrival rate has to be put in place. Or, the airport has departure runways that are dependent on arrivals not missing an approach or you'll might have 2 airplanes in the same place, one departure and the other a missed approach. IAH
is a good example of an airport that can take about 130 arrivals an hour but can't get departures out in low weather conditions due to having to protect for the missed on 27 crossing the 15 complex.
But back to the original post.....:
winglets on the 800's I hear do make them easier to land but don't change the ref speed from around 155 kts on the 800's with flaps 30.....but folks sure don't like following them on final too close.
[Edited 2006-06-15 15:00:20]
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