175 Fire Detection And Protection

Front 1

What systems have dedection and protection?

Back 1

Engines

APU

Cargo compartments

Lavatories

Front 2

How are the cabin and cockpit protected from fire?

Back 2

Cockpit has 1 Halon fire extinguisher

Cabin has 4 extinguishers (1 Fwd, 2 Aft) halon and 1 water (Aft)

Front 3

How are the engines and APU protected from fire?

Back 3

Engines have 2 Halon bottles

APU has 1

Front 4

Can the engine bottles both be used for the same engine?

Back 4

Yes.

Or 1 for each

Front 5

What is the power source for APU and engine detection and protection?

Back 5

DC ESS bus for APU pro/detection and engine detection

HOT BATT bus for engine protection

Front 6

Engine detection system

Back 6

8 pneumatic detectors

2 loops per engine

Front 7

APU detection system

Back 7

2 pneumatic fire detectors

2 loops

Front 8

Fire test

Back 8

Press test button 3-10 secs (>10 APU on will shut it down)

Fire Bell,Triple Chime

2 handles, 2 cargo smoke, APUextinguisher and EMER STOP (top half) botton, 2 master warning,

5 CAS messages

2 ITT gauges

Front 9

What happens when an engine fire handle is pulled?

Back 9

Fuel, hydrolic, and bleed, SOVs close on respective engine

Front 10

APU fire indications

Back 10

Fire Bell

Red stripe in EMER STOP button

APU FIRE EICAS message

Front 11

APU fire on ground

Back 11

Auto shut down

Front 12

APU EMER STOP pushed after a fire is detected

Back 12

APU shuts off immediately (no 1 min cooldown)

APU fuel SOV closes

APU FIRE EXTG button illuminates

Front 13

APU EMER STOP not pushed after a fire is detected

Back 13

After 1 min APU FIRE EXTG button illuminates

Front 14

Will APU extinguisher automatically discharge?

Back 14

No

Front 15

Cargo compartment smoke detectors

Back 15

3 fwd (3306 lbs)

2 aft (2535)

Front 16

What happens if fwd cargo smoke detectors trip?

Back 16

Recirculation fan shuts off (to keep O² getting in)

And ventilation outflow valve closes (to keep Halon in, not escaping to the Cabin)

Front 17

Cargo protection?

Back 17

2 Halon bottles. 1 high-rate, immidiate. 1 low-rate, over 60 min.

Both can be directed to either compartment. But only one compartment selected.

Front 18

Cargo protection in flight vs on ground? Once cargo extinguishing button is pushed.

Back 18

High rate, 1 min wait then low-rate.

On the ground low-rate does not automatically discharge.

Front 19

Is there a way around the 1 min wait for the low-rate cargo Halon bottle in flight?

Back 19

Push the Cargo Extinguishing button a 2nd time.

Also how you discharge it weight on wheels

Front 20

How are the lavs protected?

Back 20

Heat sensitive extinguishers in the waste bins, go off at a pre determined temp.