nopeapoistumiskiitoradat

Nopeapoistumiskiitoradat are specialized runways designed to safely halt aircraft that have encountered an emergency situation preventing them from achieving normal takeoff speed or aborting their takeoff run. The term, originating from Finnish, literally translates to "no-takeoff-speed-runways." These are not typical runaway arrestor systems, which are designed for aircraft that have already reached a significant speed and are trying to stop. Instead, nopeapoistumiskiitoradat are essentially an extension of the normal runway, often with a specific gradient or surface treatment, intended to assist in bringing an aircraft to a stop when its takeoff attempt is aborted very early in the roll.

The primary function of a nopeapoistumiskiitorata is to provide a safe area where an aircraft can decelerate if a critical issue arises before reaching the decision speed (V1). If a pilot decides to abort takeoff after V1, they are committed to continuing the takeoff, and standard procedures for stopping on the runway or overrunning are followed. However, in scenarios where a decision to abort is made *before* V1, or if a critical failure occurs immediately after V1 that necessitates an immediate stop, the nopeapoistumiskiitorata offers a controlled environment for this deceleration.

These specialized runways might feature a slight uphill gradient, which can assist in slowing the aircraft through gravity. Alternatively, they might have specific surface materials or a longer length compared to a standard runway to maximize braking friction and aerodynamic drag. The design aims to prevent the aircraft from veering off the runway or impacting obstacles at a high speed during an aborted takeoff. While not a common feature at all airports, they are considered in locations where specific operational risks or terrain characteristics warrant their inclusion.