FIRE PROTECTION

Question 1

Outline the fire detection?

Answer 1

A, The fire protection system is provided in order to ensure detection for:
each engine fire,
right nacelle overheat (on ground only),
each cargo compartment
and toilets smoke,
avionics compartment smoke

Question 2

Outline the fire protection?

Answer 2

Extinguishing for: 
each engine, 
cockpit, 
cabin and each cargo compartment, 
toilets waste bin

Question 3

Describe the engine fire detection?

Answer 3

Each engine has a fire detection system equipped with identical detection loops (A & B) wired in parallel to a fire detection unit.

Question 4

What is the detection principal?

Answer 4

It is based on resistance and capacitance. If there is only a change in resistance then the LOOP will be determined as being faulty by the fire detection control unit, FAULT light on LOOP PB.

Question 5

What are you checking in the FIRE and FAULT test?

Answer 5

In the FIRE test you are checking the fire signals in loop A and B. The FAULT test simulates a malfunction of the loops.

Question 6

What does it mean if the loops are connected in parallel?

Answer 6

That the circuits are connected in such a way so that if one circuit was to fail it would be backed up by the other in terms of redundancy, ie opposite to series.

Question 7

Do you keep fire loop protection if with one failed loop?

Answer 7

A fire warning will only be detected if detected in both A and B, or one, only if the other is turned off due to a fault.

Question 8

At what temperature will the NAC2 OVHT activate at, what is the maximum tailwind when in HOTEL?

Answer 8

170 deg C, 10 kts. The CCAS will activate.

Question 9

Where are the smoke detectors?

Answer 9

FWD cargo compartment and AFT cargo compartment and toilet air extraction ducts. A SMOKE and CCAS will activate through the MFC.
The avionics air extraction duct is provided with a smoke detector . Smoke between the avionics compartment and extract fan activates ELEC SMK on the CAP.

Question 10

What are you checking in a smoke test?

Answer 10

Test all 4 smoke detectors.

Question 11

What does the AFT COMPT/LAV DET FANS FAULT light mean?

Answer 11

Fan inoperation. AIR illuminates on CAP. therefore the auxillary fan will activate.

Question 12

What is SQUIB?

Answer 12

It is a small explosive device triggered by an electrical charge.

Question 13

What are you checking in the test?

Answer 13

Testing the circuitry within the SQUIB, it is limited to 1A as higher than 3A will detonate.

Question 14

How many agents do you have?

Answer 14

There are 2.

Question 15

Where are they located and what is the type of agent?

Answer 15

Installed in the wing to junction fillet on either side of the fuselage, they are freon or halon charged with nitrogen.

Question 16

How does the cockpit, cabin, and cargo compartment fire extinguishing system work?

Answer 16

They are portable.

Question 17

At what temperature does the waste bin extinguisher activate?

Answer 17

78 deg C.

Question 18

What does DISCH mean?

Answer 18

The bottle is depressurized. Bottle one will DISCH and indicate DISCH 1 on engine 1, and DISCH 2 on engine 2.

Question 19

What does FAULT mean?

Answer 19

Activated when there is a fault detected in the corresponding loop.

Question 20

What are the 7 consequences of pulling the fire handle?

Answer 20

Propeller FTH,
fuel LP valve closed,
AIR bleed and HP valve closed,
ELEC; DC and ACW generators disconnected,
SQUIBS armed its illumination, and
hydraulics to prop brake closed on engine.

Question 21

What does the AFT COMP/VAV DET FANS PB FAULT light mean?

Answer 21

The fan is out of order FAULT and CCAS activate, PB released will cause the ALTN light to illuminate and the alternate fan runs.