Which color indicates oxygen pressure is low?

Which color indicates oxygen pressure is low?

• A. Red
• B. Yellow
• C. Green
• D. Blue

Answer: (B)

In aviation oxygen systems, status is conveyed with color-coded indicators so crews can assess pressure at a glance. When oxygen pressure is normal, the indicator is green. If the pressure starts to fall, it shifts to yellow, signaling a caution — the supply is diminishing and attention is required before it becomes critical. This amber color is used because it stands out and communicates “check the system soon.” Red would indicate a more urgent, dangerous condition that requires immediate action. Blue isn’t used for this oxygen-pressure warning in this context.

In aviation oxygen systems, status is conveyed with color-coded indicators so crews can assess pressure at a glance. When oxygen pressure is normal, the indicator is green. If the pressure starts to fall, it shifts to yellow, signaling a caution — the supply is diminishing and attention is required before it becomes critical. This amber color is used because it stands out and communicates “check the system soon.” Red would indicate a more urgent, dangerous condition that requires immediate action. Blue isn’t used for this oxygen-pressure warning in this context.