by beaky » Sat Feb 05, 2005 2:43 pm
Rocketbird: no, it's not illegal to decline de-ice; the responsibility for deciding the plane is airworthy rests with the PIC. It wouldn't be practical, even for a charter or private flight, to have somebody with the FAA or the airport check for ice or frost on the wings of every bird before it departs. Sometimes. when there's a long delay, planes get de-iced then get iced up again before they're in position for takeoff!.
Hagar: Your mention of the Munich crash got me dusting off one of my favorite (but a little morbid) books:' Air Disasters' byStanley Stewart. According to that book, BEA Ambassador G-ALZU crashed not only due to ice (snow, really) on the wings, but due to slush on the runway. It was a classic case of two factors, each not a threat by itself, combining to create a disaster. If they had more lift, the slush might not have have messed things up; if there were no slush, the ice wouldn't have been much of a problem either. In fact, skimming thru this again, I see that the investigators at the time leaned towards the slush as the primary cause of the accident: somewhere around reaching V1, the nosewheel re-enterd the slush, slowing her down enough so that she barely rotated by the end of the runway, and even then she wasn't ready to fly;the nosewheel came 'unstuck' but the tail was dragging on the ground. They got the gear up, but she was probably just in ground effect (barely) at that point, and veered off towards a house, skimming the ground. The rest you know about- awful.
The captain, who survived, was sort of dragged across the coals, but in the end he was exonerated. The good news is that the effect of snow on takeoff performance was taken more seriously after that- airport personnel had measured the slush that day, but apparently it was within accepted limits for that time.
Last edited by
beaky on Sat Feb 05, 2005 2:50 pm, edited 1 time in total.