What happens if the APU fails during ground operations?

If the APU (Auxiliary Power Unit) fails during ground operations, the correct response is that there will be no air conditioning or electrical power. The APU provides essential services to the aircraft while it is on the ground, such as starting the engines and supplying power for cabin air conditioning and electrical systems.

In the event of an APU failure, these services would cease, leading to a situation where the crew would have to rely on the aircraft's batteries or external power sources to maintain critical systems. As a result, without the APU's support, the lack of air conditioning could create discomfort in the cabin for personnel, and electrical power limitations could affect various systems until alternatives are utilized.

While it's important to consider that engine shutdowns, inability to take off, or no effect on operations could be potential concerns, they do not accurately reflect the situation caused solely by APU failure during ground operations. Such a failure does not typically lead to an automatic shutdown of engines or grounding of the aircraft but rather affects the comfort and operational capabilities supported by the APU.