Fire Protection

Question 1

Will we know if there is a break in the fire loop without doing a fire test?

Answer 1

No.

Question 2

Will we know if there is a short in the fire loop?

Answer 2

Yes, we’d get a LOOP FAIL light.

Question 3

How can we differentiate between where a fire is based on sounds?

Answer 3

Fire Bell = fuel fed fire (LH/RH engine or APU).

Triple Chime = cargo or lav fire.

Question 4

Will you always hear audible warnings for a fire?

Answer 4

NO, they are ‘auto inhibited’ during ‘critical phases of flight’.

1. 70 knots through 400’ on T/O.
2. 300’ down to 70 knots on landing.

Question 5

What happens when you LIFT the FIRE BUTTON and PUSH on LH/RH Engines or APU?

Answer 5

B-bleed air shuts off.
I- Ignition (auto) is inhibited (not APU).
G- Generators (AC/DC) relays open.
F-Fuel shutoff valve closes.
M-Motive Flow valve closes (not APU).
S-Squibs are armed.

Question 6

What would indicate there was smoke in the lavatory?

Answer 6

The smoke detector would generate the following:

1. Amber master caution.
2. Single chime.
3. Amber CAS; “LAV SMOKE”

Question 7

What does the following mean:

1. Red Master Warning
2. Triple Chime
3. Red ‘LAV FIRE’ on RWP.

Answer 7

You have an empty fire bottle in the lavatory.

Question 8

How do we know if there is a break in the fire loop?

Answer 8

Upon doing the fire test, we will get a ‘LOOP FAIL’ light illuminated.