What indication do you receive from the SCBA pack when the air cylinder is between 1/2 and 1/3 full?

When the SCBA pack indicates a flashing yellow light with two quick flashes every second, it signals that the air cylinder is between 1/2 and 1/3 full. This visual indication is crucial for users as it alerts them that their remaining air supply is diminishing and they should start considering their exit strategy or conserving air.

The use of a flashing yellow light differentiates it from other indicators; a solid red light typically indicates a more critical situation, such as an excessively low air supply, while a flashing green light signifies that the air supply is at a safe level. Additionally, no lights would mean that the SCBA is either off or functioning properly with adequate air supply, which does not correspond to the situation of having between 1/2 and 1/3 air remaining. Thus, recognizing the distinct signals provided can enhance safety and preparedness during use of the SCBA.