Regarding Hold Over Time charts, what is the policy for this company?

• A. They are authorized for operational use.
• B. They are not authorized for operational use.
• C. They can be used for reference.
• D. Only if approved by the FAA.

Answer: (C)

Holdover Time charts are used as a planning aid to estimate how long the deicing/anti-icing fluid on the aircraft will remain effective under specific conditions. The policy for this company is to allow the charts to be used as a reference to gauge the likely holdover window, rather than treating them as a binding operational requirement. This means crews can consult the charts to get a best-guess holdover time based on fluid type and current conditions, but final decisions for dispatch and flight release rely on the operator’s procedures and crew judgment, plus any explicit company approvals.

In practice, you’d use the chart to get an approximate holdover time and then constantly reassess as weather, contamination, or time passes. If conditions change or the holdover time is uncertain, you’d follow the company’s SOPs, which may require reapplication or additional deicing. The FAA doesn’t issue a blanket approval for HOT charts for every operator; they’re manufacturer guidance that the operator may adopt as part of their reference materials, not as an automatic operational mandate.