SAAB 340B Fire Protection

Question 1

How is tailpipe overheating detected?

Answer 1

By 3 temperature sensors located around each engine tailpipe

Question 2

TAIL P HOT Lights (red) indicates?

Answer 2

Tailpipe overheating is detected on the related engine

Question 3

When will the light(s) extinguish?

Answer 3

Only when the temperature decreases sufficiently

Question 4

How is engine fire detection accomplished?

Answer 4

By electronic controllers which monitor the respective nacelle for excess temp increase

Question 5

Electronic controllers receive power from?

Answer 5

The Emergency Bus

Question 6

Fire detection results in? (4 items)

Answer 6

Illumination of associated FIRE handle - Firebell activation

Question 7

Fire detection results in? (4 items)

Answer 7

Illumination of associated FIRE handle - Master warning alerting

Question 8

Fire detection results in? (4 items)

Answer 8

Illumination of associated FIRE handle - Respective flashing red ENG FIRE

Question 9

How are the warning flashers and firebell cancelled?

Answer 9

Depressing either master warning flasher or Pulling illuminated FIRE handle

Question 10

How long will the FIRE handle and CWP indication remain illuminated?

Answer 10

Until the nacelle temperature decreases sufficiently

Question 11

How does the engine fire detection loops work?

Answer 11

Heat buildup causes the loops resistance to decrease which activates engine fire alerting

Question 12

What defines a short circuit of the fire detection loop?

Answer 12

A rapid decrease in loop resistance and renders the loop unreliable

Question 13

Amber FIRE DET FAIL light illuminated?

Answer 13

Flashing when a short circuit is detected in the fire loop on the related engine - Remains illuminated as long as short circuit condition exits

Question 14

Location of the engine fire extinguisher bottles?

Answer 14

Equipment compartment of each engine nacelle

Question 15

Can each bottle be used for the other engine?

Answer 15

Yes, bottles are interconnected to permit selective discharge to either engine nacelle

Question 16

When are the FIRE EXTG switches armed?

Answer 16

Only when an engine FIRE handle is pulled

Question 17

What is the purpose of the FIRE EXTG switch?

Answer 17

Electrically fires a pyrotechnic squib which punctures the port pressure seal for release of the Halon agent

Question 18

The left main and right reserve squibs are supplied by what electrical bus?

Answer 18

Left Hot Battery Bus

Question 19

The right main and left reserve squibs are supplied by what electrical bus?

Answer 19

Right Hot Battery Bus

Question 20

What are the oral warnings of an ENG FIRE, TAIL P HOT and FIRE DET FAIL?

Answer 20

ENG FIRE - Fire Bell

Question 21

What are the oral warnings of an ENG FIRE, TAIL P HOT and FIRE DET FAIL?

Answer 21

TAIL P HOT - Repetitive Chime (Triple)

Question 22

What are the oral warnings of an ENG FIRE, TAIL P HOT and FIRE DET FAIL?

Answer 22

FIRE DET FAIL - Single Chime

Question 23

Name the 5 actions that take place when the FIRE handle is pulled?

Answer 23

Main and Reserve squibs are armed

Question 24

Name the 5 actions that take place when the FIRE handle is pulled?

Answer 24

Fire Bell, Master Warning are cancelled

Question 25

Name the 5 actions that take place when the FIRE handle is pulled?

Answer 25

Generator field relay opens

Question 26

Name the 5 actions that take place when the FIRE handle is pulled?

Answer 26

HP, Engine bleed valve closes

Question 27

Name the 5 actions that take place when the FIRE handle is pulled?

Answer 27

Fuel shutoff valve closes

Question 28

Which aircraft compartments have smoke detection?

Answer 28

Avionics compartment

Question 29

Which aircraft compartments have smoke detection?

Answer 29

Lavatory

Question 30

Which aircraft compartments have smoke detection?

Answer 30

Cargo compartments

Question 31

What the sources of power?

Answer 31

Avionics compartment - Left Battery Bus

Question 32

What the sources of power?

Answer 32

Lavatory - Right Battery Bus

Question 33

What the sources of power?

Answer 33

Cargo compartments - Right Battery Bus

Question 34

AVIONIC SMOKE (red) indicates?

Answer 34

Illuminates flashing when smoke is detected in the avionics rack and remains illuminated until smoke dissipates sufficiently

Question 35

LAV SMOKE (red) indicates?

Answer 35

Illuminates flashing when smoke is detected in the lavatory and remains illuminated until smoke dissipates sufficiently

Question 36

CARGO SMOKE (red) indicates?

Answer 36

Illuminates flashing when smoke is detected in the cargo compartment and remains illuminated until smoke dissipates sufficiently

Question 37

How many Halon extinguishing bottles are available for the Cargo compartments?

Answer 37

2

Question 38

Where are they are located?

Answer 38

Aft of the C2 cargo compartment

Question 39

What type of bottles are they?

Answer 39

Dual-wall, a bottle within a bottle

Question 40

How are the cargo fire Halon bottles activated?

Answer 40

FIRE EXT switches located on the CARGO FIRE EXTG panel

Question 41

When discharged what happens?

Answer 41

Outer bottle rapidly floods the compartment - Inner bottle slowly discharges to maintain a high concentration of Halon

Question 42

With both bottles discharged how long is the fire suppression time?

Answer 42

60 minutes

Question 43

Aircraft limitations require that the fire bottles not be discharged within how many minutes of each other?

Answer 43

2 Minutes

Question 44

What is the reason for this limitation?

Answer 44

Prevent excessive pressure buildup within the compartment and subsequent blowout of the pressure relief panel

Question 45

Illumination of the CARGO EXTG (white) light indicates?

Answer 45

Low pressure is detected in the respective fire bottle

Question 46

How long will it take for this light to illuminate?

Answer 46

Up to 15 minutes

Question 47

How is fire extinguished within the avionics rack?

Answer 47

With the Halon extinguisher located behind the FO seat, it is discharged through a port located on the upper bulkhead behind the Captain

Question 48

How is the Halon distributed?

Answer 48

The port is connected to a manifold which directs the agent into all areas of the avionics rack

Question 49

How is fire extinguished in the lavatory?

Answer 49

Halon extinguisher which protects the lavatory trash bin

Question 50

How is the Halon extinguisher activated?

Answer 50

Discharges automatically via blowout of a heat-sensitive plug