21. This worked until their jets iced up in flight. 22. When roads iced up the day after Christmas, neighboring towns sent their trucks out again. 23. The wings iced up on approach to landing in Shreveport, and the plane lost altitude. 24. The wings iced up and they attempted to land. 25. The reservoirs are iced up from October to May. 26. "We live in the country and the roads are still iced up , " he said. 27. During the winter, the lake is often completely frozen over with ice up to thick. 28. So, in humid near-freezing conditions, the carburetor will be colder, and tend to ice up . 29. "People are using the Rhine ( which isn't iced up ) as much as possible ." 30. Military pilots sent to observe the unresponsive craft reported that the cockpit windows were iced up .
