What is required for the ADS Probe heat in relation to engine operation?

For the ADS (Air Data System) Probe heat to function properly, it is essential that an engine is running. This ensures that the necessary bleed air is available to provide adequate heating for the probes. The heat generated helps prevent ice accumulation on the probes, which can easily disrupt accurate air data readings critical for safe aircraft operation.

When the engine is operating, it generates bleed air, which can then be routed to the ADS probes to maintain their temperature. Ice on these probes can lead to erroneous readings of airspeed, altitude, and other crucial flight data, impacting overall flight safety and performance.

While keeping the probes clean is important for optimal operation, as any obstruction can also lead to inaccurate data, the fundamental requirement for ensuring the heating functionality of the ADS probes directly ties back to having an engine running to supply the necessary heated air.