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ATR 42-500 > Fire Protection > Flashcards

Flashcards in Fire Protection Deck (10)
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Engine Fire Detection System

Each engine is equipped with 2 fire loops mounted in parallel and a fire detection unit.

Detection is based on the variations of resistance and capacitance. If the control unit senses only a change in resistance, it will signal a loop fault.


ENG FIRE warning initiates

Both A and B loops signal fire or,
Either loop signals fire and the other is selected off.


NAC OVHT warning is initiated

Right Nacelle temperature exceeds 170*C


Cargo and LAV smoke detection systems

FWD and AFT cargo compartments are equipped with 1 optical smoke detector each.

The LAV is equipped with a photoelectric smoke detector.

All smoke warnings are sent to the CCAS through the MFC.


Avionics Smoke Detection

The avionics extract air duct is equipped with a smoke detection device that activates the ELEC SMK alert in the CCAS.


Engine Fire Extinguishing System

2 extinguisher bottles provide pressurized halon (or freon) to either engine. Dual squibs are installed in the discharge heads on each bottle. The bottles are located on both sides of the fuselage


Fire protection system provides

Detection for:
-each engine fire
-right nacelle overheat (on GND only)
-each cargo compartment and LAV smoke
-avionics compartment smoke

Extinguishing for:
-each engine
-cockpit, cabin and each cargo compartment
-LAV waste bin


LAV Waste Bin Extinguisher System

Automatic system activation occurs when the temperature in the bin rises above 78*C


Engine Fire Handle

Fire warning light is integrated into both handles and illuminates when the respective ENG FIRE warning is activated.

Pulling the ENG FIRE handle
-feathers the prop
-shuts off the fuel at the LP Valve
-closes the BLEED valve and the HP valve
-closes the DE-ICE Valve and the ISOLATION Valve
-deactivates the ACW and the DC generators
-arms the squibs



Control the ignition of the squibs and resultant discharge of extinguishing agent. DISCH light illuminates on both panels indicating the depressurized bottle.