Holdover Times Calculator
Calculate time for deicing fluid
Andrius Orlovas
Description
Calculate time for deicing and anti-icing fluids to determine how long they prevent frost, ice, or snow accumulation on aircraft surfaces. Track time from the start of the final anti-icing step. Alert when frozen deposits begin to form.
The holdover time (HOT) calculator provides estimated time that deicing/anti-icing fluid will prevent the formation of frost or ice and the accumulation of snow on the critical surfaces of an aircraft. It help flight crews make decisions.
Holdover Time begins at the start of the anti icing operation. If a two-step operation is used, then it begins at the start of the final (anti-icing) step. By definition therefore, holdover time will have effectively run out when frozen deposits start to form or accumulate on treated aircraft surfaces.