Fire Detection/Protection

Question 1

What airplane systems have fire detection and protection?

Answer 1

• Engines
• APU-
• Cargo Compartments
• Lavatories

Question 2

Are the cockpit and cabin protected from fire?

Answer 2

-Yes
-Cockpit- 1 hand held Halon Fire etinguisher
-Cabin-
2 hand held Halon FE’s (1 fwd& 1 aft)
1 hand held H20/Glycol Extinguisher (aft cabin)

Question 3

How are the engines and APU protected from fire?

Answer 3

• Engines - 2 Halon Fire Bottles

- APU - 1 Halon fire bottle dedicated to the APU only

Question 4

Can both engine fire bottles be used for one engine if needed?

Answer 4

Yes

Question 5

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

Answer 5

• Eng Detection - DC ESS
• Eng Protection - HOT BATT
• APU Det/Protection - DC ESS

Question 6

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)

Question 7

Describe the Fire Test

Answer 7

Press/hold test button for 3-10 seconds
-Aural Warnings - Fire Bell
Triple Chime
-Visual Indications - Overhead Panel
Fire Handle 1/2
Cargo Smoke (FWD/AFT) Ext. button
APU ext button
APU EMER STOP(top half button)
- Glare Shield
Master Warning Lights on both sides
-EICAS -ENG 1/2 FIRE (CAS MSG)
CARGO FWD & AFT SMOKE (CAS MSG)
APU FIRE (CAS MSG)
FIRE (Engine 1/2 ITT gauge)

Question 8

What happens when an engine fire handle is pulled?

Answer 8

Closes respective engine

• Fuel SOV
• Hydraulic SOV
• Bleed Air SOV

Question 9

What is the indication of an APU fire?

Answer 9

• Fire Bell
• Red Stripe in the EMER STOP button
• APU FIRE is displayed on the EICAS

Question 10

Will the APU automatically shutdown if a fire is detected?

Answer 10

Only on the ground

Question 11

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

Answer 11

• APU shuts off immediately without a 1 minute cool down
• APU Fuel SOV closes
• APU Fire EXTG button illuminates

Question 12

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

Answer 12

After one minute the APU FIRE EXTG button illuminates

Question 13

Will the APU fire extinguisher automatically discharge?

Answer 13

NO

Question 14

How many smoke detectors are installed in the cargo compartments?

Answer 14

• 3 in the FWD

- 2 in the AFT

Question 15

What happens to the FWD cargo compartment in the event smoke is detected? Why?

Answer 15

• Recirc fan shuts off and the Ventilation outflow valve closes
• Prevents oxygen from entering the compartment and prevents Halon agent from escaping into the aircrafts cabin

Question 16

HOw many extg bottles are installed for the cargo compartments?

Answer 16

• 2 bottles used for both compartments

- 1 high rate and 1 low rate

Question 17

What is the difference between the high rate and the low rate bottle?

Answer 17

• High rate saturates the compartment immediately

- Low rate maintains saturation over a duration of time

Question 18

How long will the Low rate bottle remain active in the compartment?

Answer 18

60 minutes

Question 19

Can one bottle be used for one compartment and the other bottle for the other compartment?

Answer 19

No. Only one compartment maybe be selected (FWD/AFT)

Question 20

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

Answer 20

• High Rate bottle discharges immediately
• Low rate dishcharges after one minute if the airplane is in flight
• If on ground, the Low rate bottle will not discharge

Question 21

During Flight, can the low rate bottle be discharged before the minute is up?

Answer 21

Yes, by pushing the extinguishing button again

Question 22

How can the low rate bottle be discharged if the airplane in on the ground (WOW)?

Answer 22

The extinguishing button must be pushed again

Question 23

Can cargo extinguishing be used if no smoke is detected?

Answer 23

• Yes. The High Rate bottle EXTG button must be pushed twice, once to arm the bottle and once to discharge the bottle
• The Low rate bottle automatically discharges after one minute if in flight

Question 24

How are the LAVs protected from fire?

Answer 24

Heat sensitive extinguishers in the LAV waste bins automatically discharge if a predetermined temp is detected (78 degrees C)