Fire Protection

Question 1

How many fire detection loops does each engine have?

Answer 1

2 loops per engine.

Question 2

If a fault is detected in one loop, will a fire or overheat still be detected?

Answer 2

Yes, remaining channel automatically switches to single channel operation. Fire detection is still available.

Question 3

What does an EICAS message “DET FIRE ENG L/R” indicate?

Answer 3

Both detector channels on one engine has failed. Fire detection system has failed.

Question 4

What are the indications of a left engine fire?

Answer 4

• Fire bell
• Master warning light
• EICAS “FIRE ENG L”
• Engine fire switch LEFT fire warning light
• Engine fuel control switch LEFT fire warning light
• Engine fire switch LEFT unlocks

Question 5

What are the indications of a left engine overheat?

Answer 5

• Caution beeper sounds
• Master caution light
• EICAS “OVERHEAT ENG L”

Question 6

In flight, what conditions will unlock an engine fire switch?

Answer 6

A fire warning or FUEL CONTROL switch in cutoff on the related engine.

Question 7

How many fire extinguisher bottles does each engine have?

Answer 7

Two bottles in total for both engines.

Question 8

What indications are given if the engine fire bottle is discharged or has low pressure?

Answer 8

• ENG BTL DISCH light illuminates (1 or 2)

- EICAS “BTL 1/2 DISCH ENG”

Question 9

Will the APU shut down automatically for a fire on the ground with both engines shut down?

Answer 9

Yes

Question 10

Is there a difference to the fire protection system on the APU when on the ground with both engines shut down and APU running?

Answer 10

Yes, a signal from a single loop is sufficient to automatically shut down the APU and discharge the bottle.

Question 11

Where is the APU ground control fire protection panel located?

Answer 11

On the nose gear

Question 12

Which areas are covered by the wheel well fire protection systems?

Answer 12

Only the main gear well

Question 13

What does the wheel well fire protection consist of?

Answer 13

Dual channel detectors for overheat and fire in the main gear wheel well.

Question 14

What are the indications of a cargo fire?

Answer 14

• Fire bell
• Master warning light
• EICAS “FIRE CARGO FWD/AFT”
• CARGO FIRE light (FWD or AFT)

Question 15

How many cargo compartment fire extinguisher bottles are there?

Answer 15

Total of 6 bottles

Question 16

How is cargo fire extinguishing initiated?

Answer 16

Automatically upon sensing a fire warning.

Can also be manually initiated by pushing CARGO FIRE DISCHARGE switch.

Question 17

How many cargo fire extinguisher bottles are fired first and how is this indicated?

Answer 17

Two bottles discharged immediately.

• CARGO FIRE DISCHARGE light illuminates
• EICAS “BOTTLE DISCH CARGO”

Question 18

When do the remaining cargo fire extinguisher bottles discharge in the air? Is this always the case?

Answer 18

After a 15 minute delay, remaining 4 bottles discharge at a reduced rate. If landing is made within the 15 minutes, one of the remaining bottles discharges on touchdown.

Question 19

What is the effect when a “CARGO FIRE ARM” switch is selected to ARM?

Answer 19

• Arms all cargo fire extinguisher bottles
• Arms the selected compartment extinguisher valve
• Turns off lower recirculation fans
• Shuts down cargo heat
• Commands the packs to minimum flow
• Shuts down bulk cargo ventilation system (AFT fire only)
• Shuts down the lavatory/galley vent fan (AFT fire only)
• Associated equipment cooling system into override mode
• Turns off miscellaneous equip. cooling fan (FWD fire only)
• Shuts of IFE cooling
• Turns off NGS
• Turns off door 4 galley chiller units (AFT fire)
• Outflow valves move to 50/50 flow split
• Turns off zonal dryer fans

Question 20

What happens when the engine fire switch is pulled out?

Answer 20

• Closes engine fuel valve and spar fuel valve
• Shuts off hydraulic fluid to the EDP
• Depressurizes the EDP
• Arms both extinguishers
• Closes the engine anti-ice valves
• Trips the generator off
• Removes power to the thrust reverser isolation valve

Question 21

How many fire detection loops are there for the APU?

Answer 21

Two loops

Question 22

How long is the delay after APU fire automatic shutdown in flight until the bottle discharges? Why?

Answer 22

15 seconds.

Allows time for the APU fuel valve to shut.

Question 23

Which cargo compartments, if any, have smoke detection?

Answer 23

All cargo compartments.

Question 24

What is the effect of pushing a CARGO FIRE DISCH switch while on the ground?

Answer 24

Three bottles discharge simultaneously into selected compartment, with third bottle at reduced rate.

Question 25

What fire protection does the main wheel well have?

Answer 25

Fire and overheat detection only, no extinguishing.

Question 26

How many smoke detection zones exist in each cargo compartment?

Answer 26

Three. Detectors: 787-8 14/6/2 787-9 18/9/2

Question 27

How many detection zones must detect smoke in a cargo compartment to initiate a fire warning?

Answer 27

Smoke in one zone is sufficient to generate a warning. Normally two detectors in compartment must detect smoke or overheat to cause a fire warning.

Question 28

How many detectors in the engines must sense a fire or overheat to produce an alert?

Answer 28

Normally, at least one element on each channel.