What should be done if the aircraft touches down after initiating a waveoff?

When the aircraft touches down after initiating a waveoff, the appropriate action is to reduce the Power Control Lever (PCL) to idle and execute a full stop landing. This response is essential because a waveoff signifies that the pilot has decided to abandon the current landing approach, often due to safety concerns, such as an obstruction on the runway or poor visibility.

By reducing the PCL to idle, the pilot effectively transitions into a controlled descent, ensuring that the aircraft can land safely without the risk of becoming airborne again or attempting a go-around under potentially unsafe conditions. A full stop landing following a waveoff aligns with standard safety protocols, as it mitigates risks related to fluctuating altitude and power management during an inadvisable takeoff after a waveoff.

Continuing the landing as planned or increasing power to make up for lost altitude could lead to an unstable approach or an uncontrolled situation, while attempting to take off could risk the safety of the aircraft and crew given that the decision to wave off indicates a need to reassess the landing environment. Therefore, bringing the PCL to idle to perform a full stop is the safest and most effective action in this scenario.