26 Fire Protction

Question 1

What are the main components of the fire protection system?

Answer 1

2 sets of sensor cable with a responder, printed circuit board, 2 firewall valves, ESIS display.

Question 2

The responder unit of the fire protection system has how many contacts and what are they for?

Answer 2

2 - The integrity switch is for continuity testing. Responder alarm switch contacts complete to activate the fire alarm system.

Question 3

What is the sensor cable filled with?

Answer 3

Outer tube is filled with an inert gas and the inner core is filled with an active gas.

Question 4

How is the responder alarm switch activated giving you your warning annunciation?

Answer 4

At the temperature of the gasses increase, the gases expand. when the gases expand to a preset level it will trip the responder alarm switch.

Question 5

What are the 3 critical zones of the engine compartment?

Answer 5

1 - Accessory compartment
2 - Plenum chamber area
3 - Engine exhaust area.

Question 6

What are the engine bleed air warning EVA tubing made of?

Answer 6

Ethylene Vinyl Acetate

Question 6

What are the engine bleed air warning EVA tubing made of?

Answer 6

Ethylene Vinyl Acetate

Question 7

Where are the engine fire bottles located?

Answer 7

In the landing gear bay aft of the main spar.

Question 8

Where the the fire ext switches located?

Answer 8

On the glare shield right and left of the ESIS unit.

Question 9

What are the fire ex bottles filled with and charged to?

Answer 9

2.5 pounds of bromotrifluormethane, pressurised to 450-475 PSI.

Question 10

Where are the portable fire extinguishers located?

Answer 10

Co pilots seat, aft cabin lower side of door frame.

Question 11

The EVA system has 2 pressure switches to sense a blown or melted tube, where are they located?

Answer 11

Below the floorboard under the copilot floor board.

Question 12

Explain the test function of the fire ext system.

Answer 12

2 toggle switches with the positions DET/OFF/EXT. EXT = Extinguisher push will illuminate.
L or R ENG FIRE push button will flash when placed in DET

Question 13

Where does the engine gets its fuel pressure from?

Answer 13

The engine driven fuel pump which is mounted in conjunction with the FCU.

Question 14

The engine driven boost pump is mounted on the Accessory pad, what is its purpose?

Answer 14

To provide sufficient fuel to the engine for all conditions whenever the N1 is turning.

Question 15

A pressure switch is mounted directly above the firewall wall fuel filter. what pressures does it actuate at?

Answer 15

9 to 11 PSI of decreasing pressure it will activate your FUEL PRESSURE light, at this time the standby boost pump should be switched on. It will Extinguish with 9-11 PSI of increasing pressure.

Question 16

The fuel filter has a bypass function, what indication will you receive?

Answer 16

A red button that will pop up indicating the filter is in a bypass condition.

Question 17

What back up do you have for the engine driven boost pump?

Answer 17

A electrically driven boost pump in the nacelle., capable of supplying enough fuel for the engine driven/fcu pump.

Question 18

What must be in operation on the side you want fuel in a crossfeed situation.

Answer 18

Standby boost pump.

Question 19

Where does the crossfeed direct the fuel?

Answer 19

Supply fuel from one side to the opposite engine.

Question 20

With crossfeed valve is open and both standby pumps operating what will happen?

Answer 20

Fuel will be supplied to the engines in the normal manner because the pressure on each side will be equal.

Question 21

What will be noted when the fuel purge system is activated?

Answer 21

Momentary rise in engine speed.

Question 22

What should be done to a fuel cell if it has originally had gasoline in it and is going into storage?

Answer 22

Purge cell with jet fuel.

Question 23

Where should fuel cells be stored?

Answer 23

In a dust free environment free from sunlight.

Question 24

Firewall shut off valve location and operation?

Answer 24

electrically operated gate type, behind the firewall on the inboard side of the nacelle.

Question 25

Crossfeed valve location?

Answer 25

inboard side of the left wheel well

Question 26

Low fuel quantity sensor is located in the nacelle fuel cell which will illuminate amber L or R Fuel Quantity, how much fuel is remaining?

Answer 26

300 pounds of fuel , calculated to provide 1/2 hour of continuous power.

Question 27

The low fuel sensor system has a time delay for what purpose?

Answer 27

reduce possibility of false low fuel indication due to sloshing.

Question 28

What levels should the fuel tanks be at for calibration?

Answer 28

Preferred procedure is to have the tanks completely empty with sumps drained, however you can calibrate it with level fuel in the thanks.

Question 29

What heat conditions must be met to activate the alarm?

Answer 29

Any one foot section - 800F
Average temp of entire cable - 360F
Zone 1 (Accesory) - 545F
Zone 2 - 900F
Zone 3 (Hot Section) - 540F

Question 30

Where is the bleed air warning system routed?

Answer 30

Next to the environmental/pneumatic lines.

Question 31

Explain the process of the annunciator/warning system in the event of a fire.

Answer 31

L or R ENGINE FIRE illuminates (RED), press L or R FW VALVE CLOSED switch (GREEN indicates valve closed and arms the extinguisher system), Push fire bottle discharge button which will illuminate AMBER, once bottle has been discharged.