CRJ900 Systems Fire Detection and Protection Flashcards
Fire detection and extinguishing is provided in the
Left and right engine core sections and APU compartment
When the heat sensing elements are subjected to heat the thermistor material
Resistance decreases
The fire detection system for the engines uses
A dual loop sensing element mounted in parallel
The cargo compartment has . ____ smoke detectors in the AFT and ____ in the FWS compartments
2 Smoke detectors in the AFT
3 smoke detectors in the FWD compartments
The engine firex bottles are located in the
Aft equipment bay
An APU fire on the ground will cause
The APU to shutdown and automatically discharge the firex bottle after 5 seconds and display a message on EICAS
The lavatory firex bottle is discharged by
Heat sensitive capsules automatically
When a fire warning is detected, the Master Warning light flashes, a fire bell sounds, an EICAS message appears, and the appropriate engine fire push light illuminates red. Pushing the ENG FIRE push light “IN” will
- Arm the dedicated squibs to the affected engine
- Close the fuel hydraulic and bleed air shut off valves
- Shutdown engine driven generator
Where are engine fire messages displayed
EICAS primary page
The fire bell can be silenced by pushing “IN” on the
Master warning switch light
ENG BOTTLE LO Caution messages are displayed on
EICAS primary page
What two subsystems comprise the Fire Overheat Protection System
Fire Overheat Detection System and Fire Extinguishing System
What unit controls the Fire Protection, Smoke Detection, and Fire Extinguishing Systems?
FIDEEX Unit (Fire Detection and Extinguishing)
The FWD/AFT Cargo Bays have both Smoke Detection and ____ equipment
Fire Extinguishing
The FWD/AFT Cargo Bays have both ____ and Fire Extinguishing equipment
Smoke Detection
Engine and APU Fire/Overheat Detection is accomplished by ____ loop(s) in the engine areas and APU compartments
Dual
Assuming all loops are operational, a Fire Warning is generated when ____ fire loop(s) senses an overheat condition
Both
Is a squib used to release Halon into the lavatory waste bin
No
Fire overheat/detection loops consist of two wires inside a metal sheath separated by
thermistor which is an insulating material
What happens when the LH or RH ENG FIRE PUSH switch light is pressed
- closes fuel SOV
- closes bleed air SOV
- closes hydraulic SOV
- arms affected squib, one on each bottle
- shuts down generator
When will an APU bottle automatically discharge if an APU fire is detected?
On the ground
Will an APU bottle automatically discharge if an APU fire is detected in flight?
No
When the respective CARGO FIREX BOTTLE ARMED PUSH TO DISCH swtich is pressed
One bottle will discharge completely and the other discharges slowly over an hour.
