FIRE PROTECTION

Question 1

What powers engine fire detection or protections?

Answer 1

ESS bus - detectors

Hot buses - bottles (protection)

Question 2

What happens when you pull fire extinguishing handle? (4)

Answer 2

By pulling you close:

1. Hyd. Pump SOV (Hydraulic Bay)
2. Fuel SOV (Wing Root)
3. Bleed Air SOV
4. Engine Intake Lip Anti-ice SOV
   H.A.L.F

Question 3

What powers APU fire detectors?

Answer 3

ESS Bus

Question 4

What class of baggage comp do we have?

Answer 4

Class C

• 2 Bottles ➡️ High Rate Discharge
↘️ Metering Discharge

Total of 50 min discharge

Question 5

How many fire bottles are there?

Answer 5

6

2 engine
2 baggage
1 APU
1 at the lavatory

Question 6

What are the engine/APU fire detection system consist of?

Answer 6

• Sensor tube filled with helium and hydrogen
• Alarm switch - detection fail
• Integrity switch - eng fire

Question 7

Can you activate the APU Fire Extinguishing system with batteries off?

Answer 7

No, it’s on DC Bus 2

Question 8

Can you activate Engine fire extinguishing system with the batteries off?

Answer 8

Yes, it’s on the Hot Bus

Question 9

When you do fire test what EICAS msgs do you see?

Answer 9

• APU FIRE
• ENG 1(2) FIRE
• BAGG SMOKE
• APU FIREDET FAIL
• E1 (2) FIREDET FAIL

Question 10

What happens when you press the APU Fire Extinguishing Button?

Answer 10

The APU fuel shutoff valve closes and APU extinguishing bottles are discharged

Question 11

What happens if you hold the fire detection test button for less than 2 sec or more than 10 sec?

Answer 11

Less than 2 sec: baggage fire ext. button remains illuminated

More than 10 sec: APU will shut down

Question 12

What happens when baggage compartment button is pressed?

Answer 12

• Both Butter Fly Valves ate close
• Extg. Bottles discharge
• Fan is deactivated