Which of the following is NOT a refueling method?

• A. Gravity (180)
• B. Pressure (359)
• C. Closed Circuit (356)
• D. Jet Stream Refueling

Answer: (D)

Refueling methods for helicopters are designed around simple, controllable fuel transfer: gravity refueling uses the force of gravity to flow fuel into the tanks, pressure refueling uses pumps to push fuel in for faster, controlled fills, and closed-circuit refueling keeps the fuel in a contained loop to maintain pressure and avoid venting or contamination. Jet Stream Refueling isn’t a recognized or practical method for UH-60s. It would require capturing or riding along a high-velocity air stream to transfer fuel, which is unsafe and incompatible with rotorcraft design and standard fueling hardware. In-flight air-to-air refueling techniques exist for some fixed-wing aircraft with specialized equipment, but they are not applicable as a helicopter refueling method. Therefore Jet Stream Refueling is not used.