Icing Page: 6 of 22
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FRAME 5 (Continued)
- - - - - - - - - _ }a F l
-- Diagram- - -
In Diagram A, the helicopter is in IFR conditions. Low visibility on the surface prohibits a
landing. If he continues flight at this present altitude there will be excessive ice buildup on his
If he knows where the freezing level is, the aviator could ascend into the warm air mass above
freezing temperatures. If the flight were under VFR conditions at a lower altitude than shown
above with surface temperature below 0 degrees C, he should descend and land, or reverse course.
.- - . FLIG HT PATH
\\- XA - -o~c
In Diagram B the flight is VFR, low altitude over flat terrain with surface temperatures above
freezing. In this case the aviator descends to an altitude that is above freezing and continues
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Snyder, Henry W. Icing, pamphlet, February 1971; Texas. (texashistory.unt.edu/ark:/67531/metapth46570/m1/6/: accessed May 27, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting Boyce Ditto Public Library.