What is the primary function of a fire handle in an aircraft's fire extinguishing system?

The primary function of a fire handle in an aircraft's fire extinguishing system is to discharge the extinguishing agent. In the event of an onboard fire, activating the fire handle releases the appropriate agent designed to suppress or extinguish flames in the affected area, typically the engine compartment or other critical locations. This action is crucial for maintaining the safety of the aircraft and its occupants, as it helps to quickly eliminate the source of the fire and prevent further escalation.

The design of the fire handle reflects the urgent nature of managing onboard fires, with a focus on rapid activation of the fire suppression system. The extinguishing agent, which may be halon or another type of approved suppressant, is directed toward the fire to achieve effective control and minimize damage.