Fire Protection

Question 1

What makes up “Loop A” of the fire system?

What makes up “Loop B of the fire system?

What condition can result in loop A failure but no fire warning?

Answer 1

• LEZ and PEZ
• MWZ
• Failure of LEZ

Question 2

What are the indications of a baggage compartment fire?

Answer 2

Smoke Light.

• Aft fire extinguisher armed
• Iff in rear baggage compartment, VENT INLT and VENT OTLT advisory lights come on.
• Associated SMOKE/EXTG advisory light illuminates.

Question 3

When does LRD fire bottle discharge?

Answer 3

Rear cargo hold:7 minutes after HRD.

Forward cargo hold: Immediately after discharge of HRD

Question 4

What is the indication a fir bottle has vented?

Answer 4

Fire Bottle low indication

Question 5

What is the indication of an APU loop fault?

Answer 5

Fault light on APU fire protection panel and “Check Fire Det” master warning on warning panel.

Question 6

How many engine fire protection loops are there for each engine?

Answer 6

2! A and B

Question 7

When does firewall shutoff valve close?

Answer 7

1) When T-Handle pulled
2) Temp in reservoir reaches 275 °F
3) Reservoir gets empty

Question 8

When you pull a Fuel/Hyd handle, what should be the indications on the fire control panel?

Answer 8

-Check fuel valves and hyd valves closed. EXTG FWD BTL and EXTG AFT BTL advisory lights illuminate.

Question 9

Apart from the Master Warning, what should be the indications for an APU fire?

Answer 9

APU Run advisory light out, APU FAIL, APU BTL LOW, and FUEL VALVE CLSD advisory lights on.

Question 10

What are Advanced Pneumatic Detectors (APDs)? How do they work?

Answer 10

They give fire and overheat detection and activate indications on FPP. There is a helium gas inside them and when heated the gas expands triggering an alarm through the control amplifier.

Question 11

What does Fault A or B indicate?

Answer 11

A broken APD. When it breaks there is a pressure loss.

Question 12

How is an engine fire indicated?

Answer 12

• Engine fire warning tone (3 chimes).
• Both ENGINE FIRE PRESS TO RESET (red) lights flash.
• CHECK FIRE DET warning light (flashing red).
• MASTER WARNING switchlight (flashing red).
• The related FUEL/HYD pull handle off will be illuminated in red.

Question 13

If PEZ fails will LEZ still work? If so, whyÉ

Answer 13

Yes because it is close to the control amplifier

Question 14

How many baggage compartment fire bottles are there?

Answer 14

3. 2 HRD and 1 LRD. The LRD is shared between AFT and FWD baggage.

Question 15

When does LRD bottle activate?

How long does it take to discharge and when will BTL low appear?

Answer 15

Rear compartment fire: 7 minutes after HRD.

Forward compartment: Immediately after HRD.

After 45 minutes.

Question 16

When does the Fire Det warning light illuminate?

Answer 16

• Engine Fire
• APU fire
• Engine or APU fault fire detection illuminates
• BTL LOW light illuminates for the engine, APU or baggage fire extinguisher bottles

Question 17

How many smoke detectors in the aft baggage compartment?

….forward baggage compartment?

Answer 17

2 one in the rear and one in the front.

1

Question 18

How many APD in the APU compartment?

Answer 18

1

Question 19

How do you know an engine fire is out?

Answer 19

T handle light and ENGINE FIRE PRESS TO RESET lights extinguish.

Question 20

What do the bottle arming lights indicate when on?

…when off?

Answer 20

Aft and/or fed fire extinguisher charged. Extinguisher discharge switch is armed.

Extinguisher discharged and associated discharge switch is disarmed.

Question 21

What happens if a BTL armed light is off with the associated PULL FUEL HYD OFF handle pulled?

Answer 21

The bottle has lost pressure or the squib has malfunctioned.

Question 22

If the low rate bottle has lost pressure how is it indicated by the test?

Answer 22

Aft=arm

Fwd=low

Question 23

When does the AFT Low Rate Fire Bottle never discharge?

Answer 23

On the ground?

Question 24

How many smoke detectors and where are they?

Answer 24

4

1 in fwd baggage, 2 in aft baggage, 1 in lav.