Under which condition are ADSPs heated?

The correct choice highlights that Air Data Sensor Probes (ADSPs) are heated whenever an engine is running. This is crucial for maintaining accurate readings of airspeed, altitude, and other vital data. During engine operation, the airflow around the ADSPs can lead to ice formation, especially in colder ambient conditions. Heating the probes prevents ice accumulation, ensuring that they function correctly and provide reliable data to the aircraft's systems.

This consistent heating during engine operation enhances safety, as it mitigates the risk of erroneous readings that could arise from ice interference. Having a dependable air data input is essential for various flight parameters and overall aircraft performance, making this heating condition critical for safe operations throughout the flight.