Every performance parameter in the flight computer assumes a perfectly clean aerodynamic profile. There is no mathematical allowance for frost.
Targeting reticle confirms a clean-surface lock while laminar streamlines illustrate the undisturbed airflow over the airfoil that the flight computer models.
Regulations dictate zero takeoff tolerance for frost, ice, snow, or slush adhering to any critical surface.
Climb rates, stall speeds, and control authority computations are strictly based on clean wings.
Flight Crew, Flight Operations Officers (FOO), and Ground Handlers share equal legal accountability in verifying compliance.