During the preflight, what should the pressure gauge read on the Portable Oxygen Bottle?

• A. 900 to 1,100 psi
• B. 2,000 to 3,000 psi
• C. 1,200 to 2,000 psi
• D. 500 to 700 psi

Answer: (C)

The key idea is that the pressure gauge on a Portable Oxygen Bottle shows how much oxygen remains, so you want a reading that confirms there’s a usable amount available. A typical, adequately charged bottle sits in the mid-to-high range, commonly around 1,200 to 2,000 psi. Reading within 1,200–2,000 psi means there’s sufficient oxygen for an emergency, and the bottle is within normal operating limits. Readings lower than about 1,200 psi suggest the bottle may be too low to rely on, while readings near or above 2,000 psi indicate a full or near-full bottle—consistent with normal use, not a fault.