Fire Protection / Detection

Question 1

What unlocks an engine fire switch?

Answer 1

• Fire warning
• Fuel control switch is in CUTOFF
• Pushing the Fire Override switch beneath the fire switch

Note:FCOM, VOL 2; 8.10.1; 8.20.3

Question 2

How many engine fire extinguishers are provided?

Answer 2

• 2 on each wing

Note:FCOM, VOL 2; 8.20.3

Question 3

What occurs when an engine fire switch is pulled out?

Answer 3

• Closes the related engine and spar valves
• Closes the related engine bleed air valve
• Trips off the related engine generator
• Shuts off hydraulic fluid to the related EDP
• Depressurizes the related EDP
• Arms both related engine fire extinguishers

Note:FCOM, VOL 2; 8.10.1

Question 4

How many APU fire bottles are provided

Answer 4

• One

Note:FCOM, VOL 2; 8.20.4

Question 5

Can you shut down the APU from outside the airplane?

Answer 5

• Yes, by using the APU Ground Control Fire Protection Panel, located in
the right body gear well.
• There is an APU stop switch, an APU Fire Control Switch and an APU
Extinguisher Discharge Switch, located on the panel.

Note:FCOM, VOL 2; 8.10.7

Question 6

What action discharges the fire extinguisher, for an engine/or APU?

Answer 6

• Rotating the engine fire switch or the APU fire switch.
• For the APU, the APU extinguisher automatically discharges for an APU
fire warning light when on the ground.

Note:FCOM, VOL 2; 8.20.4; 8.10.3

Question 7

Describe the fire protection system for the forward and aft lower cargo compartments.

Answer 7

• 4 fire extinguisher bottles are provided.
• Pushing the cargo fire discharge switch, with FWD or AFT armed,
initiates extinguisher discharge sequence to provide effective agent
concentration for 210 minutes.

Note:FCOM, VOL 2; 8.10.6; 8.20.5

Question 8

State the actions that occur when you push a FWD or AFT cargo fire arm switch.

Answer 8

• Turns off two packs
• Arms lower cargo compartment fire extinguishers
• Configures equipment cooling to override mode and turns off all airflow
and heat into lower cargo compartments.
• Closes master trim air valve.

Note:FCOM, VOL 2; 8.10.5

Question 9

What type of compartment is the main deck cargo compartment?

Answer 9

• Class E

Note:FCOM, VOL 2; 8.20.6

Question 10

What happens when you push the CARGO FIRE Depressurization Switch with the MAIN deck fire switch ARMED?

Answer 10

• Initiates a controlled cabin depressurization.

Note:FCOM, VOL 2; 8.20.6

Question 11

What happens when you push the main deck Cargo Fire Arm switch?

Answer 11

• Enables main deck fire suppression
• Turns off two packs
• Configures equipment cooling to closed loop and turns off all airflow to
main deck and airflow and heat into lower compartments.
• Closes master trim air valve

Note:FCOM, VOL 2; 8.10.5

Question 12

Describe the engine fire/overheat detection system.

Answer 12

• A dual loop fire detector is installed in each engine nacelle.
• Each engine has a dual loop overheat detector.
• Both loops in a detector must detect a fire or overheat to cause an
engine fire warning or overheat caution unless configured for single loop
operations.

Note:FCOM, VOL 2; 8.20.2

Question 13

Describe the APU Fire/Overheat detection system.

Answer 13

• A dual loop fire detector is installed in the APU compartment.
• There is no overheat detection in the APU compartment.
• Either loop detecting a fire activates an APU fire warning, which shuts
down the APU.
• Either loop detecting a fire on the ground discharges the APU fire
extinguisher bottle (certain aircraft).

Note:FCOM, VOL 2; 8.20.2

Question 14

Describe the Cargo Compartment Fire Detection systems.

Answer 14

• The forward and aft lower compartments have 4 dual loop detectors.
• The main deck has 16 dual loop detectors.
• Sample air from throughout each compartment is drawn through the
detectors by center bleed duct air. Both loops in a detector must sense
smoke to activate the cargo fire warning.

Note:FCOM, VOL 2; 8.20.2

Question 15

What happens if a fault occurs in one loop upon completion of any fire and overheat fault test?

Answer 15

• The system reconfigures for single loop operation.
• If the operable loop senses a fire or overheat condition, the related fire warning or overheat caution activates.

Note:FCOM, VOL 2, 8.20.7

Question 16

What fire detection system is provided in the wheel wells?

Answer 16

• Each main gear wheel well has a single loop detector.

Note:FCOM, VOL 2; 8.20.3

Question 17

• Each main gear wheel well has a _____ loop detector.

Answer 17

Single

Note:FCOM, VOL 2; 8.20.3

Question 18

Describe the lavatory smoke detection/protection system.

Answer 18

• Smoke detectors are installed in the lavatory. An aural warning sounds in
a lavatory when smoke is detected in that lavatory.
• An automatic fire extinguisher is located in the waste compartment in
each lavatory.

Note:FCOM, VOL 2; 8.20.3

Question 19

What will unlock the engine fire switch?

Answer 19

An engine fire warning, pushing the Fire override switch or fuel control switch in CUTOFF

Question 20

How many fire bottles are available to each engine?

Answer 20

2

Question 21

What type of fire detection do the engines and the APU have?

Answer 21

Engines have dual loop fire detection, it is an “and” system. APU is also dual loop, but is
a “or” system. Engines also have a dual loop overheat detector system, the APU does not

Question 22

What type of detection do we have for a cargo fire?

Answer 22

Dual loops, also an “and” system, four loops in each lower compartment, 16 in the main. It uses sample air from the center bleed air duct.

Question 23

What type of fire detection system do we have in the main wheel well?

Answer 23

Each main gear well has a single loop detector. No protection – have to hang the Dunlops

Question 24

What is the procedure for Fire Engine Tailpipe?

Answer 24

Aborted Engine start. Fuel control switch CUTOFF QRH

Question 25

With an APU fire light, what will automatically occur if the airplane is on the ground?

Answer 25

The APU fire warning horn will sound in the right body gear well, the APU will shut down and the APU fire extinguisher bottle will discharge.

Question 26

What happens when I push the FORWARD cargo fire arm switch?

Answer 26

Turns off two packs
Arms lower cargo compartment fire extinguishers
Configures equipment cooling to override
Turns off all airflow and heat into lower cargo compartments
Closes master trim air valve

Question 27

What happens when I push the MAIN deck cargo fire arm switch?

Answer 27

Enables main deck fire suppression
Turns off two packs
Configures equipment cooling to closed loop
Turns off all airflow to the main deck
Turns off all airflow and heat into the lower cargo compartments
Closes master trim air valve

Question 28

What happens if I push the cargo fire DEPRESS/DISCH switch if the main deck cargo fire arm switch is also pushed?

Answer 28

It opens the outflow valves to initiate a controlled cabin depressurization to slightly below airplane altitude (no longer in Vol 2)

Question 29

What happens if I push the cargo fire DEPRESS/DISCH switch if the forward or aft
switch is pushed?

Answer 29

Initiates extinguisher discharge sequence to provide effective agent concentration for 210
minutes (2 bottles discharge immediately, and the other two bottles discharge after a brief
delay, or upon touchdown)