Aircraft fire detection system - uses three transistor circuit to obviate false alarms in case of detector faults and low voltages

摘要

The electronically controlled fire detection system is designed to operate various warning elements and or protection devices by relays controlled by variable resistance surveillance detection. The system has a first transistor whose base and emitter are connected to the terminals of the detector circuits and which control the conductivity of a second transistor. The second transistor controls the supply of one or several relays controlling the warning and or protection elements. A third transistor controls the supply of a supplementary relay designed to control a fault signalling element when a fault occurs in the circuit of the detectors.