Fire Detection/Protection

Question 1

(B) What airplane systems have fire detection and protection?

Answer 1

1 - Engines
2 - APU
3 - Cargo Compartments
4 - Lavatories

Question 2

(B) Are the cockpit and cabin protected from fire?

Answer 2

Yes
Cockpit - 1 Halon Fire Extinguisher
Cabin - 3 Halon Fire Extinguishers and 1 Water Extinguisher

Question 3

(B) How are the engines and APU protected from fire?

Answer 3

Engines - 2 Halon Fire Bottles ( A and B)

APU - 1 Halon Fire Bottle

Question 4

(B) Can both engines fire bottles be used for one engine if needed?

Answer 4

Yes

Question 5

(B) What is the power source for engine and APU fire detection and protection?

Answer 5

Engine Protection - HOT BATT 1 and 2
Engine Detection - DC ESS 1 and 2
APU Protection - DC ESS 2
APU Detection - DC ESS 1 and 2

Question 6

(B) Describe the engine and APU fire detection system?

Answer 6

Engine - 8 pneumatic fire detectors (2 loops) per engine

APU - 2 pneumatic fire detectors (2 loops) per engine

Question 7

(T) Explain how system detects the overheat or fire?

Answer 7

One of the loops loses pressure within the loops, sends signal to MAU to provide an alert into the cockpit.

Question 8

(B) What happens when an engine fire handle is pulled?

Answer 8

Fuel SOV closes
Hydraulic SOV closes
Engine Bleed SOV closes

Question 9

(B) What is an indication of an APU fire?

Answer 9

• Fire bell
• Red stripe in the emergency stop button illuminates
• APU AFIRE is displayed on the EICAS

Question 10

(B) Will the APU automatically shut down if a fire is detected?

Answer 10

ONLY on the ground

Question 11

(B) What happens if the APU EMER STOP button is pushed after a fire has been detected?

Answer 11

1 - APU shuts off immediately without a 1-minute cool-down
2 - APU Fuel SOV Closes
3 - APU FIRE EXT button illuminates

Question 12

(B) What happens if the APU EMER STOP button is not pushed after a fire has been detected?

Answer 12

After 1 - minute the APU Fire Ext button illuminates

Question 13

(B) Will the APU fire extinguisher automatically discharge?

Answer 13

NO

Question 14

(B) How many smoke detectors are installed in the cargo compartments?

Answer 14

• Fwd Compartment (3)

- Aft Compartment (2)

Question 15

(B) What happens to the FWD cargo compartment in the event smoke is detected?

Answer 15

1. Recirculation fan shuts-off

2. Ventilation outflow valve closes

Question 16

(B) What is the purpose of the recirculation and outflow valve in the forward cargo compartment?

Answer 16

1. Prevents oxygen from entering the compartment

2. Prevents halon agent from escaping into the aircraft’s cabin

Question 17

(B) How many fire extinguishing bottles are installed for the cargo compartment?

Answer 17

• 2 bottles used for both compartments

- 1 High-Rate/1 Low-Rate

Question 18

(B) What is the difference between the high-rate bottle and the low-rate bottle?

Answer 18

• High-rate bottle saturates the compartment immediately (1min)
• Low-rate bottle maintains saturation over a duration of time(1hr)

Question 19

(B) How long will the low-rate bottle remain active in the compartment?

Answer 19

60 minutes

Question 20

(B) Can one bottle be used for one compartment and the other bottle for the other compartment?

Answer 20

No. Only one compartment because the fire must be extinguished by the high-rate bottle and maintain saturation after that with the low-rate bottle

Question 21

(B) What happens when a cargo extinguishing button is pushed if smoke has been detected?

Answer 21

• 1. Cargo light illuminates
• 2. High-rate bottle discharges immediately
• 3. Low-rate bottle discharges after 1 minute
     NOTE: With WOW, Low-rate bottle does not discharge automatically

Question 22

(B) During flight, can the low-rate bottle be discharged before the minute is up?

Answer 22

Yes, by pressing the button again

Question 23

(B) How can the low-rate bottle be discharged if the airplane is on the ground?

Answer 23

Pressing the button after discharging the high-rate bottle

Question 24

(B) Can cargo extinguishing be used if no smoke is detected?

Answer 24

Yes - The High-Rate bottle must be pressed twice

Then the Low-Rate bottle discharges after 1 minute

Question 25

(B) How are the lavatories protected from fire?

Answer 25

Heat-sensitive extinguishers in the lav waste bins automatically discharge if a predetermined temperature

Question 26

(T) How does the lav fire-extinguisher discharge the bottle?

Answer 26

It has waxed tips on the pressure nozzles, in which if heat reaches 78°C the tips melt off and the bottle discharges

Question 27

(O) Describe the fire test

Answer 27

1. Push the Test Button (minimum 3 sec)
2. Fire Bell and Triple Chime
   Rule 6-5-4
   - Overhead panel (6)
3. Fire Handle 1
4. Fire Handle 2
5. Cargo FWD button
6. AFT button
7. APU extinguisher button
8. APU emergency stop (Top half of button)
   - EICAS (5)
9. ENG 1 FIRE
10. ENG 2 FIRE
11. CARGO FWD SMOKE
12. CARGO AFT SMOKE
13. APU FIRE
    - Visual Indications
14. Fire (Engine 1 ITT)
15. Fire (Engine 2 ITT)
16. Master Warning light (left)
17. Master Warning light (right)

Question 28

(o) How do we know if there is smoke in the lav? What should you do?

Answer 28

• Flight attendants or smell of smoke

- QRH

Question 29

(T) When will the APU shut down on the ground automatically?

Answer 29

10 seconds after EMER STOP has not been pushed

Question 30

(O) When will the second cargo detector arm the fire bottle?

Answer 30

45 seconds from the time the first detector detected smoke