Fire Protection

Question 1

Which bottle can be discharged into
the APU?

Answer 1

Left bottle

Question 2

How do you know if a fire bottle has
discharged?

Answer 2

CAS message

Question 3

Which tests are performed with
Master Test switch?

Answer 3

P-passenger oxygen
A-annunciator
S-smoke
E-equipment overheat

Question 4

How are fire handles normally locked
in the stowed position?

Answer 4

With electrical solenoid

Question 4

What happens if a fire handle solenoid
malfunctions?

Answer 4

A manual override button underneath each
fire handle allows handle activation

Question 5

What happens when a fire handle is
pulled?

Answer 5

It shuts off fuel at tank,

Trips Generator Control Unit (GCU),

Shuts off hydraulics in tail compartment

Question 6

What happens if 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

Question 7

The smoke evacuation valve has how
many positions?

Answer 7

Two (2): CLOSED and VENT SMOKE

Question 8

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

Answer 8

Main batteries only: Not available with
emergency batteries

Question 9

What’s the location of smoke
detector?

Answer 9

Ceiling of baggage compartment as well
as galley and lavatories

Question 10

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

Answer 10

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

Question 11

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

Answer 11

No, it’s impossible without equalizing the
pressure between baggage compartment
and cabin

Question 12

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

Answer 12

Place smoke evacuation valve back to
CLOSED position. This causes baggage
compartment ventilation shutoff valve to
reopen and restore airflow to
compartment.

Question 13

Describe APU’s fire detection system

Answer 13

It has seven foot helium filled tube
secured to top of APU enclosure

Question 14

What happens to APU during a fire?

Answer 14

ECU automatically shuts it down

Question 15

Describe engine fire detection system.

Answer 15

Comprised of series of detector segments /
elements and jumper wires

Question 16

What happens when Fire Test switch
is depressed?

Answer 16

You get 13 lights and 3 chimes:

FIRE light illuminates on APU control panel,

5 red CAS messages, (L + R) equal 2
1 Amber CAS
1 APU Fire light
2 red WARN indications,
2 red Fire handle lights
2 red FUEL CONTROL switches illuminate
Fire bell sounds from nose wheel well on
ground.

Question 17

What indications do you get for an
APU fire?

Answer 17

You get 5 lights and 3 chimes:
1 Red FIRE light on APU control panel
2 Red Warn lights
1 Red CAS message
1 Amber Fault light in master switch

Additionally, you get fire bell on ground.

Question 18

What indications do you get for an
engine fire?

Answer 18

You get 5 lights and 3 chimes:
1 Red Fire Handle light
2 Red WARN indications
1 Red FUEL CONTROL star light
1 Red CAS message.

Question 19

Describe the equipment overheat
detection system.

Answer 19

A number of thermal switches are
installed in 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 amber CAS
message when that temperature is reached
and switches set at trip point of 250°F
generate red CAS message (generally
amber for electrical and red for bleed air).

Question 20

What’s the location of fixed bottles?

Answer 20

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

Question 21

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

Answer 21

Pressure relief disc seal ruptures, allowing
bottle contents to escape into tail
compartment

Question 22

What’s the location of portable fire
extinguishers?

Answer 22

One Halon extinguisher in cockpit, one
near galley and one in aft lavatory; a water
extinguisher also comes standard