skyblue CBT fire protection Flashcards
what does the overheat system in the RH engine provide?
an overheat warning if an overheat occurs in hotel mode
what are the cargo compartments have?
photoelectric smoke detectors
where is the lavatory fire extinguisher?
waste bin
where is the avionics compartment smoke detector?
between the avionics compartment and extract fan
where are the 3 halon fire extinguishers?
1 in the flight deck
2 in the aft cabin behind the last row of seats
where is the water fire extinguisher?
forward cabin crew station
what powers the 2 loops in each FIRE DETECTION CONTROL UNIT?
DC ESS BUS
When will the right nacelle overheat detection create a warning?
when RH nacelle temperature goes above 170C
if we get a RH OVHT during taxi due to a tailwind, what should we do?
incrase power slightly. if the warning persists after 30 seconds shut the engine down
if we get a RH OVHT what should we do?
power lever to idle
condition lever to feather and then fuel shutoff
how does each detection loop work?
nickel core coated with a salt based layer
salts changes resisatnce with temp changes meaning current through the nickel core increases
when will the FDCU trigger a fire warning?
a low resistance and high capacitance in both fire loops
what should we do if we get a loop fault?
deselect the affected loop
can the loop detect a fire with a break in it?
yes, but only with 1 break
what else can trigger a fire warning?
increase in compartment temperature due to something like a bleed leak
what does the engine fire extinguishing system consist of?
2 halon fire bottles. one on each side of fuelage
what is the squib?
a pyrotechnic charge which is electrically detonated
what will display when a bottleis discharged?
AGENT 1 or 2 DISCH
what powers the ENG FIRE handles?
DC EMER BUS
what 6 things will pulling on the fire handle do?
- arms the squibs
- closes he bleed and HP bleed valves
- closes the pneumatic de ice isolation valves
- trips the DC and ACW generators
- closes the LP fuel valve
- runs electric feather pump to feather the prop
why should we shut the engine down with the condition lever before pulling the fire handle?
closing the LP fuel valve may collapse the fuel line preventing future restart
when will the red light in the condition lever extinguish?
when a fire is no longer detected
after fuel is shutoff
what does the fire fault test do?
tests the systems ability to detect fire and fault signals
what will display on a succesful engine fire test?
illuminated handle
condition lever red fuel SO light
master warning
CRC
ENG 1 FIRE on EWD
what will a succesful test of the FDCU display?
amber LOOP on EWD
FAULT lights on loop buttons
master caution
single chime
how do we know a squib test is succesful?
squib light will illuminate when button is pushed
how is the squib tested?
a lower than normal current is sent to the squib
what kind of smoke detectors do the aft and forward cargo compartments have?
photoelectric
what kind of smoke detectors do the lavatory vent line and the avionics extract duct have?
ionisation
what powers the smoke detectors?
DC ESS BUS
how do the photoelectric smoke detectors detect smoke?
light reflected off the smoke
how do the ionisation smoke detectors detect smoke?
measure an electrical circuit of ions between plates.
when the ions bind to smoke they will break the circuit and trigger a warning
how many extract fans are there in the aft cargo compartment?
- only 1 runs at a time
what powers the extract fans?
AC STBY BUS
how do we select the alternate AFT cargo fan in the event of a failure?
AFT COMPT/LAV DET FANS button on the cargo smoke panel
when are smoke warnings inhibited?
during takeoff
how can a fire extinguisher be fired into the rear cargo compartment?
through an inlet in the flight attendant panel
after the extinguisher is used, the cargo compartment needs to be opened to verify the fire is out
how is the lavatory waste bin extinguisher triggered?
melting fusable plugs
