How is an A320 on the ground kept cool inside if the APU fails? What happens to the air conditioner when the APU is not available due to damage or it just fails?
Also adding that the airport does not have an air conditioning unit. Since it is above average sea level, what procedures should be performed?
They can leave one engine running to take the place of the APU. If that's not possible for whatever reason, the interior just gets warm.