After the agent has been discharged to a cargo compartment about how long will it be until the DISCH light comes on?

After the agent has been discharged to a cargo compartment about how long will it be until the DISCH light comes on?

• A. about 30 seconds
• B. about 60 seconds
• C. about 2 minutes
• D. immediately

Answer: (B)

The DISCH light is the indication that the cargo-fire extinguishing system’s discharge has been completed and verified. After the agent is released into a cargo compartment, there’s a built-in delay of about 60 seconds for the discharge to fully occur and for the system circuitry to confirm that the agent has been released. This delay prevents a false indication from a partial discharge or transient pressure changes and gives the crew a reliable visual cue that the compartment has been protected. So, the light comes on roughly one minute after discharge.

The DISCH light is the indication that the cargo-fire extinguishing system’s discharge has been completed and verified. After the agent is released into a cargo compartment, there’s a built-in delay of about 60 seconds for the discharge to fully occur and for the system circuitry to confirm that the agent has been released. This delay prevents a false indication from a partial discharge or transient pressure changes and gives the crew a reliable visual cue that the compartment has been protected. So, the light comes on roughly one minute after discharge.