Which configuration corresponds to 74-50% air on the SCBA head-up display?

Which configuration corresponds to 74-50% air on the SCBA head-up display?

• A. Two yellow lights (36-49%)
• B. Three green lights (74-50%)
• C. Four green lights (100-75%)
• D. One red light (35% and under)

Answer: (B)

Your SCBA head-up display uses a stacked light system to show remaining air, with colors signaling how urgent the situation is. Green lights indicate usable air; yellow warns; red signals danger. For the 74–50% air range, three green lights are lit. That specific pattern shows you’re between about three-quarters and half full, which matches the 74–50% range. The other patterns don’t fit this range: four green lights mean you’re in the 100–75% range (more air), two yellow lights indicate about 36–49% air (lower and uses yellow to signal caution), and one red light denotes 35% or under (very low air).

Your SCBA head-up display uses a stacked light system to show remaining air, with colors signaling how urgent the situation is. Green lights indicate usable air; yellow warns; red signals danger. For the 74–50% air range, three green lights are lit. That specific pattern shows you’re between about three-quarters and half full, which matches the 74–50% range.

The other patterns don’t fit this range: four green lights mean you’re in the 100–75% range (more air), two yellow lights indicate about 36–49% air (lower and uses yellow to signal caution), and one red light denotes 35% or under (very low air).