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 extinguisher
• cabin: 4 hand-held halon fire extinguishers (2 fwd and 2 aft)

Question 3

How are the engines and APU protected from fire?

Answer 3

• Engines: 2 halon fire bottles

- APU: 1 dedicated halon fire bottle

Question 4

Can both engine fire bottles be used on the same engine?

Answer 4

Yes

Question 5

What is the power source engine and APU fire detection and prevention?

Answer 5

• Engine detection: DC ESS
• Engine protection: HOT BATT
• APU detection: DC ESS
• APU protection: DC ESS

Question 6

Describe the engine and APU fire detection system

Answer 6

• Engine: 2 detector loops per engine

- APU: 2 detector loops

Question 7

Fire test, how long do you hold the button?

Answer 7

• press and hold the test button for at least 3 seconds, if APU is running then no more than 10 secs or APU will auto shutdown

Question 8

Fire test, what are the aural warnings?

Answer 8

• fire bell

- triple chime

Question 9

Fire test, what visual indications should you see on the overhead panel?

Answer 9

Six lights:

• fire handle 1 and 2
• cargo smoke fwd extinguisher button
• cargo smoke aft extinguisher button
• APU extinguisher button
• APU EMER STOP button (top half)

Question 10

Fire test, what indications should you get on the glareshield?

Answer 10

2 master warning lights

Question 11

Fire test, what visual indications will you receive on the EICAS?

Answer 11

5 messages, 2 ITT FIRE

• ENG 1 FIRE
• ENG 2 FIRE
• CARGO FWD SMOKE
• CARGO AFT SMOKE
• APU FIRE

Question 12

What happens when an engine fire handle is pulled?

Answer 12

Closes respective engine:

• Fuel SOV
• Hydraulic SOV
• bleed SOV

Question 13

What is an indication of an APU fire?

Answer 13

• fire bell
• red stripe in EMER STOP button
• APU FIRE message on EICAS

Question 14

Will the APU stop automatically if a fire is detected?

Answer 14

Only on the ground

Question 15

What happens if the APU EMER STOP button is NOT pushed after a fire is detected?

Answer 15

After one minute the APU FIRE EXTG button illuminates

Question 16

Will the APU fire extinguisher automatically discharge

Answer 16

No

Question 17

How many smoke detectors are in the cargo compartments?

Answer 17

• 3 in FWD

- 2 in AFT

Question 18

What happens to the forward compartment in the event smoke is detected?

Why?

Answer 18

• recirc fan shuts off
• ventilation outflow valve closes
• prevents oxygen from entering and halon from escaping into aircraft cabin

Question 19

How many fire bottles exist for the cargo compartments?

Answer 19

• 2 bottles shared for the two compartments

- one high rate, one low rate

Question 20

What is the difference between the two cargo fire bottles?

Answer 20

• high rate bottle saturates compartment immediately

- low rate bottle maintains saturation over a period of time

Question 21

How long will the low rate bottle remain active?

Answer 21

60 minutes

Question 22

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

Answer 22

No. Only one compartment may be selected, forward or aft

Question 23

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

Answer 23

• high rate bottle discharges immediately

- low rate bottle discharges after one minute if in flight (if weight on wheels, the bottle will not auto discharge)

Question 24

In flight, can the low rate bottle be discharged immediately?

Answer 24

Yes, push the EXT button a second time (first time discharges the high rate bottle)

Question 25

How can you discharge the low rate cargo ext bottle on the ground?

Answer 25

Press the EXT button three times

Question 26

Can cargo extinguishing be used if no smoke is detected?

Answer 26

Yes. Press the EXT button twice. First press arms the bottles, second press discharges the high rate bottle, low rate bottle discharges one minute later if in flight

Question 27

How are the lavs protected from fire?

Answer 27

Heat-sensitive extinguishers discharge when a certain temp is reached