Chapter 7: Fire Protection

Question 1

Engine Fire Handle

Answer 1

Pull – Closes the following:

- Engine Bleed SOV
- Fuel SOV
- Hydraulic SOV
- Crossbleed Valve

Question 2

Engine Fire Protection Electrical Supply

Answer 2

Detection:

- MAU 1A (DC ESS BUS 1)
- MAU 3A (DC ESS BUS 2)

Extinguishing:

- HOT BATT BUS 1
- HOT BATT BUS 2

Question 3

APU Fire Detection Electrical Supply

Answer 3

Detection:

- MAU 1A (DC ESS BUS 1)
- MAU 3A (DC ESS BUS 2)

Extinguishing:
-DC ESS BUS 2

Question 4

Engine Fire Indications

Answer 4

• Fire bell
• Master WARNING light illuminates
• Associated fire handle illuminates
• “Fire” on associated ITT gauge
• EICAS warning message

Question 5

APU Fire Indications

Answer 5

• Fire bell
• Red stripe on “APU emergency stop” button illuminates
• Master WARNING light illuminates
• EICAS message

Question 6

APU Fire Extinguisher Pushbutton

Answer 6

Pressing this button (regardless of whether it’s already illuminated)
-Discharges APU fire bottle
-Shuts down the APU through the APU FADEC
-Closes the APU fuel shutoff valve
-Displays EICAS message
Illuminates if:
-“APU Emergency Stop” button has been pressed
-1 minute has passed since fire detected

Question 7

APU Emergency Stop Pushbutton

Answer 7

Pressing the “APU Emergency Stop” pushbutton:

- Shuts down the APU through the APU FADEC without a cooldown period
- Illuminates a white striped bar on the "APU Emergency Stop" pushbutton
- Illuminates "APU Fire Extinguisher" pushbutton entirely red

Question 8

APU Automatic Shutdown

Answer 8

On the ground only, 10 seconds after fire detected

Question 9

Cargo Smoke Detection

Answer 9

Forward Cargo:
-Three (3) smoke detectors (DC ESS BUS 1 [x2] and DC ESS BUS 2 [x1])
Aft Cargo:
-Two (2) smoke detectors (DC ESS BUS 2 [x1] and ???)

Question 10

Cargo Fire Detection Automation

Answer 10

Forward:
-Compartment air circulation fan turns off
-Compartment ventilation outflow valve closes
-High-rate fire extinguisher bottle armed
Aft:
-High-rate fire extinguisher bottle armed

Question 11

Cargo Fire Indications

Answer 11

• Fire bell
• Master WARNING light illuminates
• Associated cargo compartment extinguishing pushbutton illuminates
• EICAS message

Question 12

Cargo Fire Extinguishing Bottle Location

Answer 12

Center Avionics Bay

Question 13

Cargo Fire Extinguishing Pushbutton Logic

Answer 13

Button is armed and illuminates if:
    -Fire has been detected
    -Pushbutton is pressed (if not already armed)
Pressing armed button:
    -Discharges the high-rate bottle
Pressing button again:
    -Discharges the low-rate bottle

*In-flight only, low-rate bottle discharges 1 minute after the high-rate bottle

Question 14

Lavatory Fire Protection

Answer 14

• One (1) smoke detector in each lav

- One (1) fire extinguisher on each waste container

Question 15

Lavatory Smoke Indications

Answer 15

• Master WARNING light
• EICAS message
• Smoke alarm in respective lav and smoke detector light is on
• Flashing orange rainbow light