FCOM

Question 1

Fire and overheat detection and extinguishing systems for the

Answer 1

• Engines

* APU

Question 2

Smoke detection and extinguishing systems for the :

Answer 2

• Cargo compartments

* Lavatories

Question 3

Smoke detection for the :

Answer 3

Avionic bay

Question 4

Portable fire extinguishers for the

Answer 4

• Flight compartment

* Passenger cabin

Question 5

The engines and the APU each have a fire and overheat detection system consisting of:

Answer 5

‐ Two identical fire detection loops (A and B) mounted in parallel
‐ A Fire Detection Unit (FDU).

Question 6

The fire detection loops consist of:

Answer 6

‐ Three or four  sensing elements for each engine, in the pylon nacelle, in the engine core and in the engine fan section
‐ One sensing element in the APU compartment.

Question 7

How many extinguisher does the engine have?

Answer 7

Each engine has two extinguisher bottles equipped with electrically operated squibs to discharge their contents.

Question 8

How many extinguisher does the APU have?

Answer 8

The APU has one fire extinguisher bottle that has two electrically operated squibs to discharge its agent.

Question 9

The fire warning appears in case of

Answer 9

• a fire signal from both loop A and B or,
• a fire signal from one loop when the other is faulty, or
• breaks in both loops occuring within 5 s of each other (flame effect), or
• a test performed on the control panel.

Question 10

The loop-fault cautions appear if :

Answer 10

• one loop is faulty or,
• both loops are faulty or,
• the fire detection unit fails.

Question 11

ENG 1 (2) FIRE pb performs the following for the corresponding engine :

Answer 11

‐ Silences the aural fire warning
‐ Arms the fire extinguisher squibs
‐ Closes the low-pressure fuel valve
‐ Closes the hydraulic fire shut off valve
‐ Closes the engine bleed valve
‐ Closes the pack flow control valve
‐ Cuts off the FADEC power supply
‐ Deactivates the IDG

Question 12

APU FIRE pb sw performs the following for the APU :

Answer 12

‐ shuts down the APU
‐ silences the aural warning
‐ arms the squib on the APU fire extinguisher
‐ closes the low-pressure fuel valve
‐ shuts off the APU fuel pump
‐ closes the APU bleed valve and X bleed valve and deactivates the APU generator.

Question 13

The automatic shutdown of the APU on the ground will not occur

Answer 13

if the flight crew is performing this test.

Question 14

How and Where the smoke detector unit is installed in avionic bay?

Answer 14

One smoke detector in the air extraction duct of the avionics ventilation system detects smoke in the avionics compartment.

Question 15

GEN 1 LINE SMOKE Light

Answer 15

Comes on amber, along with a warning on ECAM, when smoke is detected in the avionics ventilation duct.

Question 16

The lavatory smoke detection system consists of :

Answer 16

‐ One smoke detector in each lavatory.

‐ A double channel Smoke Detection Control Unit (SDCU).

Question 17

SDCU

Answer 17

Smoke Detection Control Unit

Question 18

How SDCU works?

Answer 18

When a detector finds smoke in a lavatory, it sends a signal to the SDCU, which transmits it to the Flight Warning Computer (FWC), for Warning in the cockpit, and to the CIDS (for warning in the cabin).