AAR90 From United States of America, joined Jan 2000, 3437 posts, RR: 49 Reply 3, posted (13 years 1 month 4 days 5 hours ago) and read 764 times:
Used at all altitudes where required. Where required depends upon aircraft type and airline operating specifications. For example, AA MD90 Operating manual requires use of airfoil anti-ice "...when icing conditions exist or are anticipated." AA B757 Operating manual lists a minimum temperature below which anti-ice is not required (I think it's -43C, but don't quote me on that -- I've been trying to forget B757 limits for a year).
*NO CARRIER* -- A Naval Aviator's worst nightmare!