Fire Protection

Question 1

Which bottle can be discharged into
the APU?

Answer 1

Left bottle

Ref: AOM 2A

Question 2

How do you know if a fire bottle has
discharged?

Answer 2

You get an associated CAS message
Ref: AOM 2A

Question 3

How are fire handles normally locked
in the stowed position?

Answer 3

By an electrical solenoid
Ref: AOM 2A

Question 4

What happens if a fire handle
solenoid malfunctions?

Answer 4

A manual override button underneath each fire handle
allows handle activation
Ref: AOM 2A

Question 5

What happens when a fire handle is
pulled?

Answer 5

It shuts off fuel at the tank, trips the Generator
Control Unit (GCU), and shuts off hydraulics in the
tail compartment
Ref: AOM 2A

Question 6

What happens if the engine fire
persists after discharging the first
bottle?

Answer 6

Fire handle may be rotated to inboard DISCH 2
position to inject agent from left fire bottle into the
engine
Ref: AOM 2A

Question 7

The smoke evacuation valve has how
many positions?

Answer 7

Two

Question 8

Fire testing, detection, and protection
is available down to what source of
power?

Answer 8

Main batteries only: it’s not available with emergency
batteries
Ref: AOM 2A

Question 9

What’s the location of smoke
detector?

Answer 9

Ceiling of baggage compartment
Ref: AOM 2A

Question 10

What happens when the smoke
evacuation valve is selected to
VENT/SMOKE position?

Answer 10

Smoke evacuation valve opens and baggage
compartment air is vented overboard through a vent
on ceiling of baggage compartment. Air is exhausted
overboard through right side wing-to-body fairing
near lavatory servicing.
Ref: AOM 2A

Question 11

Can the interior baggage
compartment door be opened once
the baggage compartment is
depressurized?

Answer 11

No, it’s impossible without equalizing the pressure
between baggage compartment and cabin
Ref: AOM 2A

Question 12

If interior baggage compartment door
is closed, what’s the process for
reentry once the baggage
compartment depressurizes?

Answer 12

Smoke evacuation valve must be placed back to
NORMAL position, and reset toggle switch must be
held UP for 10 seconds. This causes baggage
compartment ventilation shutoff valve to reopen and
restore airflow to the compartment.
Ref: AOM 2A

Question 13

Describe the engine fire detection
system.

Answer 13

Each detector rail assembly is comprised of two
mechanically parallel, electrically independent
thermal detector loops (Loop A and Loop B) mounted
on a support tube.
Ref: AOM 2A

Question 14

What computer monitors the fire
detection system?

Answer 14

Fire Detection Control Unit
Ref: AOM 2A

Question 15

What happens if a fire loop fails?

Answer 15

The flight crew can deselect the affected loop and
continue to operate in a single loop configuration (in
accordance with MMEL).
Ref: AOM 2A

Question 16

What happens when you depress the
R ENG FIRE TEST switch?

Answer 16

You get three chimes and eight lights: LOOP A,
LOOP B, two red W’s, two red CAS messages, light
in right fire handle, and starlight in the right engine
fuel control switch handle.
Ref: AOM 2A

Question 17

Describe the APU’s fire detection
system.

Answer 17

It has a seven foot helium filled tube secured to the
top of APU enclosure
Ref: AOM 2A

Question 18

What happens to the APU during a
fire?

Answer 18

ECU automatically shuts down the APU
Ref: AOM 2A

Question 19

What happens when APU FIRE
TEST switch is depressed?

Answer 19

You get three chimes and eight lights: APU TEST
light on fire test panel, FIRE light on APU control
panel, two red W’s, two amber C’s, and two CAS
messages. Additionally, you get a fire bell in nose
wheel well if the aircraft is on ground.
Ref: AOM 2A

Question 20

What indications do you get for an
actual APU fire?

Answer 20

You get three chimes and only four lights: FIRE light
on APU control panel, two red W’s, and one red CAS
message. Additionally, you get a fire bell on ground.
Ref: AOM 2A

Question 21

Describe the equipment overheat
detection system.

Answer 21

A number of thermal switches are installed in the
aircraft interior to monitor temperature levels. They
utilize two preset temperatures: 150°F and 250°F,
depending on location and type of equipment
monitored. Switches set at trip point of 150°F
generate an amber CAS message when that
temperature is reached and switches set at trip point
of 250°F generate a red CAS message (generally
amber for electrical and red for bleed air).
Ref: AOM 2A

Question 22

What’s the location of the fixed
bottles?

Answer 22

Two identical single shot fire bottles are mounted in
tail compartment: pressurized by nitrogen and filled
with Halon.
Ref: AOM 2A

Question 23

What happens if a bottle becomes
over pressurized due to excessive
temperature?

Answer 23

A pressure relief disc seal ruptures, allowing bottle
contents to escape into the tail compartment
Ref: AOM 2A

Question 24

What’s the location of portable fire
extinguishers?

Answer 24

One Halon extinguisher in cockpit, and two (2) Halon
extinguishers in cabin
Ref: AOM 2A