After deicing is done, where is type I fluid failure most likely to be visible?

Type I de-icing fluid is primarily used to remove snow, ice, and frost from the aircraft's surfaces, especially before takeoff. After the application of this fluid, the area where failure is most likely to be visible is on the wings. This is because the wings are critical to maintaining proper aerodynamic performance. The fluid is applied to ensure that ice or frost does not adhere to the surface, which could affect lift and control during flight.

If the de-icing process is effective, the fluid should remain in place until the aircraft is airborne. However, if there is a failure, it is often because the fluid has either not adhered properly or has been removed by airflow as the aircraft accelerates down the runway. The wings experience significant aerodynamic forces, making them the most susceptible to any issues related to fluid retention. Thus, any sign that the Type I fluid has not performed as expected will typically manifest on the wings first, making it the most critical area to monitor to ensure safe flight operations.