Which component is typically closed or tripped when the fire-pull T-handle is activated on a jet engine?

Which component is typically closed or tripped when the fire-pull T-handle is activated on a jet engine?

• A. The engine fuel shutoff valve is closed and the generator field relay is tripped.
• B. The hydraulic pump is started.
• C. The anti-ice valve closes.
• D. The compressor bleed air valve closes.

Answer: (A)

When the fire-pull T-handle is activated on a jet engine, the system is designed to rapidly isolate the engine from potential fuel sources and electrical power while arming the extinguishing system. This means the engine’s fuel shutoff valve is closed to stop any further fuel flow, helping to starve the fire. It also trips the generator field relay to disconnect electrical generation from the engine, reducing the risk of sparks and electrical feed to the affected area. The other options don’t reflect the primary actions of a fire handle: starting the hydraulic pump would be counterproductive, and closing anti-ice or bleed air valves isn’t the standard immediate response to a fire indication.

When the fire-pull T-handle is activated on a jet engine, the system is designed to rapidly isolate the engine from potential fuel sources and electrical power while arming the extinguishing system. This means the engine’s fuel shutoff valve is closed to stop any further fuel flow, helping to starve the fire. It also trips the generator field relay to disconnect electrical generation from the engine, reducing the risk of sparks and electrical feed to the affected area. The other options don’t reflect the primary actions of a fire handle: starting the hydraulic pump would be counterproductive, and closing anti-ice or bleed air valves isn’t the standard immediate response to a fire indication.