What quantity is entered for oxygen on the AFTO Form 781?

• A. Liters only
• B. Gallons only
• C. Pressure and quantity
• D. Pounds only

Answer: (C)

The correct entry for oxygen on the AFTO Form 781 is the combination of pressure and quantity. This method is essential because it accurately reflects the operational capabilities of the oxygen system on the aircraft.

In aviation, oxygen systems are often subject to specific pressure conditions, and knowing both the pressure and the volume of oxygen available helps ensure that pilots and crew can make informed decisions about oxygen availability and usage during flight.

Relying solely on either liters or gallons would not provide a complete picture of the oxygen supply since these measurements do not take into account the effects of pressure on the gas. Similarly, using pounds alone does not adequately convey how much oxygen is available under varying pressure conditions critical for performance and safety. Therefore, documenting both pressure and quantity ensures a comprehensive understanding of the oxygen system's status.