Which action ensures safe decoupling of ground air lines from equipment?

Which action ensures safe decoupling of ground air lines from equipment?

• A. Bleed pressure using the ground air bleed valve, then close the equipment angle cock
• B. Turn on the station power and disconnect
• C. Increase the pressure before disconnecting
• D. Remove the equipment from the car

Answer: (A)

Relieving pressure before disconnecting is essential. When you uncouple, air stored in the ground air line can rush out and potentially cause injury or unintended braking actions if the line is still charged. The proper sequence is to vent the ground air line using the ground air bleed valve to bring the pressure down, then close the equipment angle cock to isolate the equipment from the line. With the line depressurized and the equipment isolated, you can safely disconnect the coupling. The other actions don’t address pressure relief or isolation. Turning on station power doesn’t affect the air line, increasing pressure before disconnecting increases the danger of a sudden release, and removing the equipment from the car while still pressurized could lead to unsafe braking or injury.

Relieving pressure before disconnecting is essential. When you uncouple, air stored in the ground air line can rush out and potentially cause injury or unintended braking actions if the line is still charged. The proper sequence is to vent the ground air line using the ground air bleed valve to bring the pressure down, then close the equipment angle cock to isolate the equipment from the line. With the line depressurized and the equipment isolated, you can safely disconnect the coupling.

The other actions don’t address pressure relief or isolation. Turning on station power doesn’t affect the air line, increasing pressure before disconnecting increases the danger of a sudden release, and removing the equipment from the car while still pressurized could lead to unsafe braking or injury.