Moderate to Severe Icing
Dear Cribble.
Thanks for your technical "run down" on your TRENT-engine!
The wx. during app. of BA38 was in broken clouds with a ground temperature of 11 degrees C. that gives a possible severe icing, since: "The higher the temperature the more severe is the icing condition in 100% humid air" (up to plus 10 degrees C.)
How was the wx. at Los Angeles, where American Airlines had "hesitation" in a Trent?
And according to the latest Norwegian research, by meteorologist Aasmund Rabbe, freezing rain is far more dangerous to jet engines than freezing fog, (by factor 100) due to droplet size, this leaves the FAA AD from 23. jan. 2008 send out to: "Avoid engine failures on short final" in need to explain: "Why the reduction from 1000m to 300m in freezing precipitation, during ground operation (before "run-ups" shall be performed) can be a "tool" to have less (all) engine failures on short final"
Engine anti-ice procedures should be stressed and improved or Boeing 777s with RR engines grounded until a better reason is found.