The APU draws its fuel from where?

• A. Center Tank
• B. No. 1 Main Fuel Cell
• C. No. 2 Main Fuel Cell
• D. External Source

Answer: (B)

APU fuel is routed through a dedicated feed to ensure reliable start and operation, without tying into the engine fuel system. In the UH-60S, the APU draws its fuel from the No. 1 Main Fuel Cell. This keeps the engine fuel for flight coming from other tanks (such as No. 2) and preserves fuel management flexibility, while providing a stable source for the APU itself.

The center fuel tank isn’t used as the normal APU source, as its role is more about overall storage and crossfeed considerations rather than feeding the APU directly. An external fuel source is only used for ground testing or special procedures, not for regular APU operation.

So, the No. 1 Main Fuel Cell is the correct source because it provides a dedicated, reliable feed for the APU separate from the engines’ fuel supply.