Fire Protection

Question 1

Components with Fire Detection and Extinguishing capabilities

Answer 1

– Engines
– APU
– Cargo Compartments
– Lavatories
– Passenger Cabin
– In-Flight Entertainment System

Question 2

Pulling Fire Extinguisher handle

Answer 2

closes associated:

• engine bleed air shutoff valve
• engine fuel shutoff valve
• engine hydraulic shutoff valve
• crossbleed shutoff valves

Question 3

Engine Fire Detection and extinguishing power supply

Answer 3

– Engine fire detection:
MAU 1 (DC ESS BUS 1) and MAU 3 (DC ESS BUS 2)

– Engine fire extinguishing:
HOT BATT BUS 1 and HOT BATT BUS 2

Question 4

Alarms and Messages triggered with an Engine Fire

Answer 4

AURAL
– aural warning;

LIGHTS
– the fire extinguisher handle illuminates;
– the master WARNING lights illuminate;

EICAS MESSAGES
– the FIRE warning light on the respective ITT indicator illuminates;
– the EICAS WARNING message ENG 1 (2) FIRE is displayed

Question 5

How many Fire Extinguishing Bottles

Answer 5

• 2 x engines (Bottle A & B)
• 1 x APU
• 2 x cargo installed in center avionics bay (High-rate and Low-rate)
• 3 x lavatory installed in each waste container (automatic)

Question 6

Electrical supply for APU fire and detection

Answer 6

– APU fire detection:
MAU 1 (DC ESS BUS 1) and MAU 3 (DC ESS BUS 2)

– APU fire extinguishing:
DC ESS BUS 2

Question 7

APU Fire alarms and messages

Answer 7

AURAL
– aural warning;

LIGHTS
– the red stripped bar of the APU emergency stop button illuminates;
– the master WARNING lights illuminate;

EICAS MESSAGES
– the EICAS WARNING message APU FIRE is displayed.

Question 8

APU Auto shutdown

Answer 8

• on the ground; and
• 10s after fire detected
• Fire Detection Test Button pressed for more than 10S

Question 9

Pressing APU FIRE EXTINGUISHER Button

Answer 9

– discharges the APU fire bottle.
– shuts down the APU through the APU FADEC.
– closes the APU fuel shutoff valve (SOV).
– displays an EICAS ADVISORY message APU FIREX BTL DISCH

Question 10

How many cargo compartment smoke detectors

Answer 10

• two smoke detectors in FWD cargo

- three smoke detectors in AFT cargo

Question 11

What happens when smoke is detected in FWD or AFT cargo?

Answer 11

FWD Cargo:
– The high-rate fire extinguishing bottle is armed and;
– The forward cargo compartment ventilation outflow valve is commanded closed

AFT Cargo:
– The high-rate fire extinguishing bottle is armed
– Aft Baggage Compartment “Do Not Enter” sign is turned on

Question 12

Pressing FWD/AFT Cargo Smoke buttons

Answer 12

• high-rate fire-extinguishing bottle to discharge immediately into the selected cargo compartment
• One minute later (or pressing button a 2nd time), the second fire-extinguishing bottle discharges
  automatically at a reduced flow rate and the agent remains in the
  selected cargo compartment for 135 minutes*button must be pressed a 2nd time on the ground

Question 13

APU FIRE EXTINGUISHER BUTTON

Answer 13

• Closes the APU fuel shutoff valve

- discharges the APU fire extinguisher bottle