Fire System

Question 1

What does the FIRE/OVHT TEST switch do?

Answer 1

Push and hold: Runs a whole system detection test. A successful test will give EICAS indication FIRE TEST PASS.

Question 2

What happens when you pull an engine fire switch? Rotate it?

Answer 2

PULL:
-Closes spar fuel valve
-Closes bleed air valve
-Turns off IDG
-Shuts off hydraulic fluid and depressurizes engine hydraulic pump
-Arms both related fire extinguisher bottles (2 per wing)

Rotate: Rotate to either A or B and it blows that bottle

Question 3

How many fire bottles per wing?

Answer 3

2
A and B

Question 4

What does it mean when the engine fire switch is illuminated red?

Answer 4

Either a fire is detected or you are doing a fire test

Question 5

Normally, for any fire switch, its locked until a fire is detected. Can you override this lock?

Answer 5

Yes, using the override switch above the handle

Question 6

How many fire bottles for the APU?

Answer 6

1

Question 7

What happens when you pull the APU fire switch? Rotate it?

Answer 7

PULL:
-Arms fire bottle
-closes fuel valve
-closes bleed air valve
-closes inlet door
-trips generator and breaker
-Shuts down APU

ROTATE: Discharges bottle

Question 8

What happens when you push the MAIN cargo fire arm switch?

Answer 8

-Enables main deck fire suppression
-Turns off 2 packs
-Configures equipment cooling to closed loop
-Turns off all airflow to main deck and all airflow and heat into lower cargo compartments
-Closes master trim air valve

Question 9

What happens when you push either FWD or AFT cargo fire arm switches?

Answer 9

-Turns off 2 packs
-Arms lower cargo fire bottles
-Configures equipment cooling to override mode
-Turns off all airflow and heat into lower cargo compartments
-Closes master trim air valve

Question 10

With the MAIN cargo fire arm switch armed, what happens when you press the CARGO FIRE DEPRESS/DISCH switch?

Answer 10

It depressurizes the aircraft

Question 11

With either FWD or AFT cargo fire arm switches armed, what happens when you press the CARGO FIRE DEPRESS/DISCH switch?

Answer 11

It initiates extinguisher discharge sequence to provide effective agent concentration for 210 minutes. (400F.. lots of different times for different variants)

Question 12

What areas of the aircraft have fire detection?

Answer 12

-APU
-Engines
-Cargo compartments
-Lavatories
-Crew rest (No protection)
-Main gear wells (No protection)

Question 13

The fire warning bell sounds for _____ then a ______ off cycle

Answer 13

one second ON

10 seconds OFF

cycle

Question 14

How many fire detection loops for each engine? How many loops must be triggered for fire detection?

Answer 14

2 (dual loop)

Both loops (unless configured for single loop operation)

Question 15

How many fire detection loops for APU? How many loops must be triggered for fire detection?

Answer 15

2 (dual loop) however either loop causes warning

Question 16

How many fire detectors on the main deck of a 400F? How many to trigger a warning?

Answer 16

16 dual loop detectors

Both loops in 1 detector to trigger warning

Question 17

How many fire detectors in the FWD or AFT lower cargo? How many trigger warning?

Answer 17

4 dual loop

Both loops in 1 detector trigger warning

Question 18

How many fire detection loops are in the gear well?

Answer 18

Each gear well has a single loop detector

Question 19

What detection/protection does the crew rest and lavatory have?

Answer 19

Crew rest: Smoke detector, no protection

Lav: Smoke detector, and automatic extinguisher in trash bin