26 Fire Protction Flashcards
What are the main components of the fire protection system?
2 sets of sensor cable with a responder, printed circuit board, 2 firewall valves, ESIS display.
The responder unit of the fire protection system has how many contacts and what are they for?
2 - The integrity switch is for continuity testing. Responder alarm switch contacts complete to activate the fire alarm system.
What is the sensor cable filled with?
Outer tube is filled with an inert gas and the inner core is filled with an active gas.
How is the responder alarm switch activated giving you your warning annunciation?
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.
What are the 3 critical zones of the engine compartment?
1 - Accessory compartment
2 - Plenum chamber area
3 - Engine exhaust area.
What are the engine bleed air warning EVA tubing made of?
Ethylene Vinyl Acetate
What are the engine bleed air warning EVA tubing made of?
Ethylene Vinyl Acetate
Where are the engine fire bottles located?
In the landing gear bay aft of the main spar.
Where the the fire ext switches located?
On the glare shield right and left of the ESIS unit.
What are the fire ex bottles filled with and charged to?
2.5 pounds of bromotrifluormethane, pressurised to 450-475 PSI.
Where are the portable fire extinguishers located?
Co pilots seat, aft cabin lower side of door frame.
The EVA system has 2 pressure switches to sense a blown or melted tube, where are they located?
Below the floorboard under the copilot floor board.
Explain the test function of the fire ext system.
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
Where does the engine gets its fuel pressure from?
The engine driven fuel pump which is mounted in conjunction with the FCU.
The engine driven boost pump is mounted on the Accessory pad, what is its purpose?
To provide sufficient fuel to the engine for all conditions whenever the N1 is turning.
A pressure switch is mounted directly above the firewall wall fuel filter. what pressures does it actuate at?
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.
The fuel filter has a bypass function, what indication will you receive?
A red button that will pop up indicating the filter is in a bypass condition.
What back up do you have for the engine driven boost pump?
A electrically driven boost pump in the nacelle., capable of supplying enough fuel for the engine driven/fcu pump.
What must be in operation on the side you want fuel in a crossfeed situation.
Standby boost pump.
Where does the crossfeed direct the fuel?
Supply fuel from one side to the opposite engine.
With crossfeed valve is open and both standby pumps operating what will happen?
Fuel will be supplied to the engines in the normal manner because the pressure on each side will be equal.
What will be noted when the fuel purge system is activated?
Momentary rise in engine speed.
What should be done to a fuel cell if it has originally had gasoline in it and is going into storage?
Purge cell with jet fuel.
Where should fuel cells be stored?
In a dust free environment free from sunlight.
Firewall shut off valve location and operation?
electrically operated gate type, behind the firewall on the inboard side of the nacelle.
Crossfeed valve location?
inboard side of the left wheel well
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?
300 pounds of fuel , calculated to provide 1/2 hour of continuous power.
The low fuel sensor system has a time delay for what purpose?
reduce possibility of false low fuel indication due to sloshing.
What levels should the fuel tanks be at for calibration?
Preferred procedure is to have the tanks completely empty with sumps drained, however you can calibrate it with level fuel in the thanks.
What heat conditions must be met to activate the alarm?
Any one foot section - 800F Average temp of entire cable - 360F Zone 1 (Accesory) - 545F Zone 2 - 900F Zone 3 (Hot Section) - 540F
Where is the bleed air warning system routed?
Next to the environmental/pneumatic lines.
Explain the process of the annunciator/warning system in the event of a fire.
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.
