FIRE PROTECTION – GENERAL
The purpose of the fire protection system is to detect for overheating or fire
in the engine compartments and presence of smoke in the baggage
compartment.
The fire protection system comprises
• the engine fire detection system
• the engine fire extinguishing system
• the baggage compartment smoke detection
FIRE DETECTION SYSTEM – GENERAL
The purpose of the engine fire detection system is to detect high
temperature, fire or hot gas leakage into the engine compartments.
The system comprises a heat fire detector installed in each engine
compartment.
When fire or hot gas leak are detected, the indicating system permits to
identify the location of the fire.
FIRE DETECTION SYSTEM – MAIN COMPONENTS
HEAT FIRE DETECTOR
The heat detector is made of a continuous firewire element and a responder.
FIREWIRE
The firewire is the sensing element and consists of:
• a stainless steel tube containing the gas (helium) under pressure;
• a core material (wire) located inside the tube.
The core material is a gas absorption material impregnated with hydrogen.
One end of the firewire is connected to the responder and the other end is
sealed.
RESPONDER
The responder contains two pressure switches: the high pressure switch and
the low pressure switch.
The high pressure switch, in case of fire or hot gas leak, generates the ENG
FIRE message.
The low pressure switch, in case of failure of the engine fire detection
system (like for example, the breaking of a tube) generates the FIRE DET
message.