When a leak occurs, the propellant leak indicators turn which colors?

When a leak occurs, the propellant leak indicators turn which colors?

• A. red or blue
• B. green or white
• C. orange or purple
• D. black or yellow

Answer: (D)

Propellant leak indicators are designed to give a quick, unmistakable signal to the crew when a leak occurs. In this system, the indicators turn black or yellow to signal a leak. These high-contrast colors stand out under different lighting and against bodywork, so a leak is spotted rapidly, enabling prompt safety procedures and isolation if needed. Other colors are used for different conditions or warnings, so they wouldn’t accurately signal a propellant leak.

Propellant leak indicators are designed to give a quick, unmistakable signal to the crew when a leak occurs. In this system, the indicators turn black or yellow to signal a leak. These high-contrast colors stand out under different lighting and against bodywork, so a leak is spotted rapidly, enabling prompt safety procedures and isolation if needed. Other colors are used for different conditions or warnings, so they wouldn’t accurately signal a propellant leak.