What actions occur when an illuminated fire handle is pulled in a large jet aircraft fire protection system?

Pulling the fire handle in a large jet aircraft fire protection system initiates critical safety actions designed to mitigate the risk of fire and protect the aircraft and its occupants. The correct answer involves disconnecting the generator field and closing the hydraulic shutoff.

When the fire handle is pulled, the generator field is disconnected to eliminate electrical power that could ignite fuel in the event of a fire. This action helps to prevent fires from escalating while also ensuring that the electrical systems in that part of the aircraft remain isolated. Additionally, closing the hydraulic shutoff valve prevents hydraulic fluid from flowing to components potentially affected by fire, which reduces the risk of fire spreading through flammable hydraulic fluids.

These actions are essential steps in the fire response procedure within aviation safety protocols, ensuring that the focus is on isolating and extinguishing the potential source of fire quickly, thereby protecting the aircraft and its passengers.