What is one condition that allows takeoff when frost is adhering to the wings?

The condition that allows takeoff when frost is adhering to the wings is that the operation is conducted as per the Pilot Operating Handbook (POH). The POH provides flight crews with specific operational procedures and limitations for the aircraft, including guidance on critical factors like wing contamination from frost or ice. It contains the manufacturer's recommendations, which are based on extensive testing and certification requirements. Following the procedures outlined in the POH ensures that the takeoff is conducted safely under established parameters, which may include acceptable limits regarding the presence of frost on wings.

While removing frost from the wings or having heated wings may sound like viable options, in this context, adhering to the comprehensive guidelines provided in the POH takes precedence. The POH would specify required procedures for operating with frost and outline any necessary mitigations, including adjustments to performance calculations or specific pre-takeoff checks. Additionally, the time of day does not inherently relate to the safety of a takeoff under such conditions, making those options less relevant.