Which statement best describes Hold Over Time charts in this operation?

• A. They are fully authorized for operational use.
• B. They must be used only with Type I fluid.
• C. They can be used for reference but not for operational use.
• D. They are completely prohibited.

Answer: (C)

Hold Over Time charts show how long the deicing/anti-icing fluid is expected to protect the aircraft surface under current conditions. They’re a reference tool that helps you estimate a feasible window for takeoff after deicing, based on fluid type, concentration, temperature, and precipitation. However, in this operation they aren’t the sole basis for a decision to depart; you still must perform a current, real‑world assessment—visually inspect the surfaces, consider any changes in weather, verify that the fluid coverage is adequate, and follow your operator’s procedures. If conditions change or there’s any doubt about surface contamination, you should reapply deicing/anti‑icing or delay departure.