Can the APU be used during anti-icing/deicing procedures?

The correct answer indicates that the Auxiliary Power Unit (APU) should not be used during anti-icing or de-icing procedures. This is primarily due to safety and operational considerations. The APU can produce exhaust fumes, which may interfere with the de-icing fluid's effectiveness, pose risks to personnel on the ground, and possibly contaminate surfaces that require cleaning.

Utilizing the APU during these critical phases could lead to an increase in the risk of contamination or reduced efficacy of the ice and snow removal procedures. Furthermore, during anti-icing and de-icing, it is essential to maintain the integrity of the aircraft surfaces to ensure safety during subsequent operations, and the presence of exhaust from the APU can compromise that integrity.

Understanding this point is crucial for maintaining safety and operational efficiency in aviation operations, particularly regarding ground handling practices.