Fire Protection/Detection

Question 1

What unlocks an engine fire switch?

Answer 1

• Fire warning
• Fuel control switch is in CUTOFF
• Pushing the engine Fire Override switch.FCOM, VOL 2; 8.10.1; 8.20.4

Question 2

How many engine fire extinguishers are provided?

Answer 2

• 2 on each wing.
- One or both can be discharged in either engine on a wing.
FCOM, VOL 2; 8.20.4

Question 3

What occurs when an engine fire switch is pulled out?

Answer 3

• Closes the related engine and spar fuel 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 extinguishersFCOM, VOL 2; 8.10.1

Question 4

How many APU fire bottles are provided?

Answer 4

• One

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.
FCOM, VOL 2; 8.10.9

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.
FCOM, VOL 2; 8.20.3; 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,
fires two bottles immediately.
• Two remaining bottles discharge after approximately 30 minutes,
and metered for 180 minutes.
• On touch down the remaining agent will discharge completely.

FCOM, VOL 2; 8.10.5/ QRH 8.12

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,
• Turns off all airflow and heat into lower cargo compartments, and
• Closes master trim air valve.FCOM, VOL 2; 8.10.6

Question 9

What type of compartment is the main deck cargo compartment?

Answer 9

• Class E
• Lower lobe compartment is class E.FCOM, VOL 2; 8.20.7

Question 10

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

Answer 10

• Initiates aeroplane depressurisation by opening both outflow valves.

FCOM, VOL 2; 8.10.6/8.20.7

Question 11

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

Answer 11

• Enables main deck fire suppression
• Configures equipment cooling to closed loop, and
• Turns off two packs
• Turns off all airflow and heat to LL cargo compartments, and
• turns off all airflow to the main deck, and
• Closes master trim air valve.FCOM, VOL 2 8.10.6/8.20.7

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 operation.

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.

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, unless configured
for single loop operations.

FCOM, VOL 2; 8.20.3

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.

FCOM, VOL 2, 8.20.8

Question 16

What fire detection system is provided in the wheel wells?

Answer 16

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

FCOM, VOL 2; 8.20.3

Question 17

Is there smoke detection provided for the Crew Rest areas?

Answer 17

• Smoke detectors are installed in the crew rest areas,
• An aural warning sounds in the crew rest compartment
when smoke is detected in that compartment.

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 the lavatory when smoke is detected.
• An automatic fire extinguisher is located in the waste
compartment in each lavatory.

FCOM, VOL 2; 8.20.3

Question 19

What occurs when an APU fire switch is pulled?

Answer 19

• Arms APU fire extinguisher bottle,
• Trips APU generator field and generator breaker,
• Close APU fuel and bleed air valves,
• Closes the APU inlet door,
• Shuts down the APU(If auto shutdown does not occur.)FCOM VOL 2 8.10.3

Question 20

What does APU BTL DISCH light mean?

Answer 20

• Extinguisher bottle has discharged, or has low pressure.

Question 21

What does BTL A/B DISCH amber lights mean?

Answer 21

• The extinguisher bottle is discharged or has low pressure.