Fire Protection

Question 1

What does the fire protection system provide fire detection and extinguishing capabilities for?

Answer 1

engines, APU, cargo compartments and lavatories

Question 2

What happens when you pull the fire extinguishing handle?

Answer 2

shuts off the fuel and hydraulic shutoff valves and and bleed air valves

Question 3

what happens when you rotate the fire handle left/right?

Answer 3

discharges the fire extinguishing bottle into the respective engine

Question 4

what does the APU fire extinguishing guarded button do?

Answer 4

momentary action button
closes APU fuel shutoff valve and discharges the APU fire extinguisher bottle

Question 5

what does the cargo fire detection/ fire extinguishing button (guarded)

Answer 5

momentary action button
according to system logic, discharges the high and low-rate bottles of the associated cargo compartment when the button is lit.
pressing the button when it is not illuminated arms the associated extinguishing bottle and the button illuminates red.

Question 6

how long do you push the fire test button for? what happens if you hold it for too long?

Answer 6

3 seconds. anything more than 10 shuts the APU down

Question 7

What are you looking for when you push the fire detection system button?
what does it does?

Answer 7

6-2-2-7
Overhead Panel: (6)
Fire handle 1
Fire handle 2
Cargo smoke (aft) extinguishing button
Cargo smoke (Fwd) extinguishing button extinguishing button
APU extinguishing button
APU EMERG STOP (top half of button)

Glare shield lights: (2)
Master warning light (left)
Master warning light (right)

Aural: (2)
Fire Bell
Triple Chime

EICAS MSGS (7)
ENG 1 FIRE
ENG 2 FIRE
CARGO FWD SMOKE
CARGO AFT SMOKE
APU FIRE
FIRE (Engine 1 ITT gauge)
FIRE (Engine 2 ITT gauge)

Question 8

what is the fire protection system designed for?

Answer 8

fire detection, protection and continuous built in tests (BITs) to detect internal faults

Question 9

what supplies electrical power for electrical fire detection?

Answer 9

MAU 1 (DC essential bus 1) and MAU 3 (DC essential bus 2)

Question 10

what supplies electrical power for fire extinguishing?

Answer 10

HOT BATT BUS 1 and HOT BAT BUS 2

Question 11

what is the APU Fire Extinguishing system comprised of?

Answer 11

one push button
one discharge bottle

Question 12

what happens when you push the APU Fire Extinguishing button?

Answer 12

discharges the APU bottle
shuts down the APU thru the APU FADEC
closes the APU fuel shut off valve (SOV)
displays EICAS msg: APU FIREX BTL DISCH

Question 13

Where is the APU bottle located?

Answer 13

near the rear fuselage

Question 14

how many smoke detectors are in the cargo bays?

Answer 14

3 fwd
2 aft

Question 15

what happens if smoke is detected in the fwd cargo bay?

Answer 15

air circulation fan automatically close and outflow valve closes
FWD fire extinguishing bottle is armed

Question 16

what happens if smoke is detected in the aft cargo bay?

Answer 16

AFT fire extinguishing bottle is armed

Question 17

what is the cargo fire extinguishing system comprised of?

Answer 17

one high-rate extinguishing
one low rate extinguishing

Question 18

Where are the cargo fire extinguishing bottles located?

Answer 18

center avionics bay - can be used for either compartment

Question 19

what happens after the annunciation of smoke detection in the cargo compartment?

Answer 19

pressing the associated cargo compartment button causes
the high-rate bottle to discharge immediately into selected cargo compartment.
the EICAS ADVISORY message CRG FIREX HI DISCH to display

one minute later the second fire extinguishing bottle discharges automatically at a reduced flow rate and the agent remains in the selected cargo compartment for 60 minutes

Question 20

what smoke detection/protection do we have in the lavatories?

Answer 20

one smoke sensor on the ceiling, one fire extinguisher bottle in each lav waste container.

Question 21

what happens if smoke is detected in either lavatory?

Answer 21

the mast WARNING light illuminates
the EICAS WARNING msg LAV SMOKE is displayed
in the lav where smoke has been detected - an alarm sounds and smoke detector light comes on
flashing amber light on the respective attendant lights panel (rainbow?) illuminates