CRJ900 Systems Fire Detection and Protection

Question 1

Fire detection and extinguishing is provided in the

Answer 1

Left and right engine core sections and APU compartment

Question 2

When the heat sensing elements are subjected to heat the thermistor material

Answer 2

Resistance decreases

Question 3

The fire detection system for the engines uses

Answer 3

A dual loop sensing element mounted in parallel

Question 4

The cargo compartment has . ____ smoke detectors in the AFT and ____ in the FWS compartments

Answer 4

2 Smoke detectors in the AFT

3 smoke detectors in the FWD compartments

Question 5

The engine firex bottles are located in the

Answer 5

Aft equipment bay

Question 6

An APU fire on the ground will cause

Answer 6

The APU to shutdown and automatically discharge the firex bottle after 5 seconds and display a message on EICAS

Question 7

The lavatory firex bottle is discharged by

Answer 7

Heat sensitive capsules automatically

Question 8

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

Answer 8

1. Arm the dedicated squibs to the affected engine
2. Close the fuel hydraulic and bleed air shut off valves
3. Shutdown engine driven generator

Question 9

Where are engine fire messages displayed

Answer 9

EICAS primary page

Question 10

The fire bell can be silenced by pushing “IN” on the

Answer 10

Master warning switch light

Question 11

ENG BOTTLE LO Caution messages are displayed on

Answer 11

EICAS primary page

Question 12

What two subsystems comprise the Fire Overheat Protection System

Answer 12

Fire Overheat Detection System and Fire Extinguishing System

Question 13

What unit controls the Fire Protection, Smoke Detection, and Fire Extinguishing Systems?

Answer 13

FIDEEX Unit (Fire Detection and Extinguishing)

Question 14

The FWD/AFT Cargo Bays have both Smoke Detection and ____ equipment

Answer 14

Fire Extinguishing

Question 15

The FWD/AFT Cargo Bays have both ____ and Fire Extinguishing equipment

Answer 15

Smoke Detection

Question 16

Engine and APU Fire/Overheat Detection is accomplished by ____ loop(s) in the engine areas and APU compartments

Answer 16

Dual

Question 17

Assuming all loops are operational, a Fire Warning is generated when ____ fire loop(s) senses an overheat condition

Answer 17

Both

Question 18

Is a squib used to release Halon into the lavatory waste bin

Answer 18

No

Question 19

Fire overheat/detection loops consist of two wires inside a metal sheath separated by

Answer 19

thermistor which is an insulating material

Question 20

What happens when the LH or RH ENG FIRE PUSH switch light is pressed

Answer 20

1. closes fuel SOV
2. closes bleed air SOV
3. closes hydraulic SOV
4. arms affected squib, one on each bottle
5. shuts down generator

Question 21

When will an APU bottle automatically discharge if an APU fire is detected?

Answer 21

On the ground

Question 22

Will an APU bottle automatically discharge if an APU fire is detected in flight?

Answer 22

No

Question 23

When the respective CARGO FIREX BOTTLE ARMED PUSH TO DISCH swtich is pressed

Answer 23

One bottle will discharge completely and the other discharges slowly over an hour.