389 

Federal Aviation Administration, DOT 

Pt. 25, App. C 

(c) 

Takeoff maximum icing. 

The maximum 

intensity of atmospheric icing conditions for 
takeoff (takeoff maximum icing) is defined 
by the cloud liquid water content of 0.35 g/ 
m3, the mean effective diameter of the cloud 
droplets of 20 microns, and the ambient air 

temperature at ground level of minus 9 de-
grees Celsius (

¥

9 

°

C). The takeoff maximum 

icing conditions extend from ground level to 
a height of 1,500 feet above the level of the 
takeoff surface. 

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