Chapter 5 - Ground Crew Supplement

Heat Loss

104.  The heated ADF should be dispensed as close to the surface to be deiced as possible. Application of heated fluid from a distance results in the significant cooling of the fluid enroute to the aircraft surfaces which will reduce the fluid's ability to remove frozen contaminants. The thermal energy contained in heated ADF fluids has been shown to be a principle factor in the efficient removal of frozen contaminants from the aircraft's surfaces. Therefore, within limits, the hotter the fluid is when it reaches the aircraft's surfaces, the more effective it will be in removing the contaminants. The deicing operator training program will need to emphasize correct techniques to get the best performance from the fluid in use.