What is the minimum starting temperature for the APU?

The minimum starting temperature for the Auxiliary Power Unit (APU) is indeed crucial for its efficient operation. The correct value listed here is -40°C. At this temperature threshold, the APU can reliably perform its functions, such as providing electrical power and bleed air for starting engines or supplying air conditioning systems, without risking damage or operational failure.

Temperatures lower than this can impede the APU's ability to start properly, leading to potential mechanical problems or increased wear and tear. It's essential for operators to be aware of this limit to prevent failure in freezing conditions, which could impair overall aircraft operations. Understanding these temperature specifications is vital for the safe and effective use of an APU, especially in cold environment scenarios.