Fire Protection

Question 1

The detection system of the fire protection system detects fire possibility where?

Answer 1

• Engines
• APU
• Main Landing Gear Bays

Question 2

The extinguishing system of the fire protection system extinguishes fire possibility where?

Answer 2

• Engines
• APU

Question 3

Both the engine and the APU have how many detection loops?

Answer 3

Two. Both must sense an overheat condition in a preset time to generate a fire indication.

Question 4

The control unit for the fire protection system is what?

Answer 4

FIREX-CU. Electronic fire detection and extinguishing control unit monitors the electrical resistance of the loops.

Question 5

The FIRE-CU control unit is located where?

Answer 5

Aft equipment bay

Question 6

If one loop fails in a dual loop system, what happens?

Answer 6

The second loop is still capable of detecting a fire.

Question 7

If a fire is detected in the engine, what six things happen?

Answer 7

• Affected L/R ENG FIRE switch illuminates
• Master warning light illuminates
• Master warning chimes
• Affected L/R ENGINE FIRE message appears on EICAS
• Red FIRE EI appears in the N1 indicator
• Aural “Left” or “Right Engine Fire” sounds

Question 8

An APU fire can only be extinguished from what bottle?

Answer 8

Bottle 2

Question 9

When an overheat condition is detected in the APU area on the ground, what occurs?

Answer 9

The APU shuts down automatically. Five seconds later, bottle 2 automatically discharges Halon into the APU enclosure.

Question 10

When an overheat condition is detected in the APU area in flight, what occurs or must happen?

Answer 10

The APU FIRE switch is pushed to shut down the APU and arm the discharge cartridge on bottle 2. The crew discharges the bottle 2 by pushing FIRE EXT 2 switch.

Question 11

If a fire is detected in the APU enclosure, what five things occur?

Answer 11

• APU FIRE switch illuminates
• Master warning light illuminates
• Master warning chimes
• APU FIRE red warning message appears on EICAS
• Aural “APU FIRE” sounds

Question 12

Why do the wheel wells require an overheat detection system?

Answer 12

Because the wheel wells are made of composite materials

Question 13

The main landing gear bays are protected by how many detection loops?

Answer 13

One

Question 14

What three things happen when an overheat is detected in a main landing gear bay?

Answer 14

• Master warning lights illuminate
• A triple chime sounds
• A GEAR BAY OVHT red warning CAS message illuminates

Question 15

Should a fire occur in the cargo bay, how is the crew notified?

Answer 15

• Master warning lights illuminate
• Master warning chime sounds
• CARGO SMOKE red warning illuminates on EICAS

Question 16

What detects a fire or the presence of smoke in the cargo area?

Answer 16

Single smoke detector mounted in the ceiling

Question 17

How is a fire extinguished in the cargo area?

Answer 17

Must be extinguished with a portable fire extinguisher

Question 18

The FIREX bottles are filled with what?

Answer 18

Halon 1301

Question 19

What occurs when a L or R ENG FIRE switch is depressed? (7)

Answer 19

• Applicable squib on both bottles is armed
• Both EXT 1 and 2 switches illuminate ARMED
• Fuel shutoff valve closes
• Hydraulic shutoff valve closes
• Generator selected offline
• Bleed air shutoff valve closes
• FADEC commands an engine shutdown

Question 20

What occurs when the APU FIRE switch is depressed? (6)

Answer 20

• APU squib on bottle 2 is armed
• EXT 2 switch illuminates ARMED
• APU fuel shutoff valve closes
• APU bleed-air shutoff valve closes
• APU generator selected offline
• APU ECU closes the APU fuel metering valve