Approximately how many pounds per hour does the APU consume?

Approximately how many pounds per hour does the APU consume?

• A. 60 Lbs/Hour
• B. 120 Lbs/Hour
• C. 240 Lbs/Hour
• D. 90 Lbs/Hour

Answer: (B)

The amount the APU uses per hour is a measure of fuel flow when it’s providing power to the helicopter’s systems. For the UH-60S, the APU is sized to supply electrical power and environmental control without running the main engines, so its fuel flow is a relatively modest, steady rate. Approximately 120 pounds per hour translates to about 16 gallons per hour in JP-8, depending on fuel density. This level is typical when the APU is supplying usual electrical load and bleed air. If the electrical/air demand increases, the APU will approach that higher figure; with lighter loads it will fall below it. The other options imply either too low or too high a load for normal APU operation, so 120 pounds per hour is the representative estimate.

The amount the APU uses per hour is a measure of fuel flow when it’s providing power to the helicopter’s systems. For the UH-60S, the APU is sized to supply electrical power and environmental control without running the main engines, so its fuel flow is a relatively modest, steady rate. Approximately 120 pounds per hour translates to about 16 gallons per hour in JP-8, depending on fuel density. This level is typical when the APU is supplying usual electrical load and bleed air. If the electrical/air demand increases, the APU will approach that higher figure; with lighter loads it will fall below it. The other options imply either too low or too high a load for normal APU operation, so 120 pounds per hour is the representative estimate.