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604 - ATPL - When a bimetallic strip is used as a switch in a fire detection loop, a fire alarm is triggered after a delay. The purpose of this delay is to:

Question 604 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Delay the triggering of the fire extinguishers and increase their efficiency
Allow temperatures to equalise
Wait for the triggering of the second fire detection loop in order to confirm the fire
Avoid false alarms in case of vibrations

Training tests and timed exam simulations ATPL - Airline Transport Pilot license