fire protection Flashcards
when the OVHT DET switch is on Normal are both Loop A and B active ?
YES
pae 8.10.1
can you select a single Loop via the OVHT DET switch ? How ?
YES
by selecting either A or B
page 8.10.1
what happens when you push the Fire Warning BELL CUT OUT Switch ?
- extinguishes both master FIRE WARN lights
- silences the fire warning bell
- silences the remote APU fire warning horn (on the -ground only)
- resets the system for additional warnings
page 8.10.1
what is the EXT TEST Switch used for ?
to test bottle discharge system continuity for all 3 extinguisher bottles
(L and R engine and APU)
page 8.10.1
what does the FAULT/INOP and OVERHT/FIRE TEST switch do when switched to the FAULT/INOP side ?
tests fault detection circuits for both engines and the APU
page 8.10.1
what does the FAULT/INOP and OVERHT/FIRE TEST switch do when switched to the OVERHT/FIRE side ?
tests overheat and fire detection loops on:
- both engines
- APU
- wheel well fire detector
page 8.10.1
what causes the APU Fire Switch to illuminate red ?
fire in the APU
page 8.10.1
when the APU Fire Switch illuminates red a fire in the APU has been detected, what happens to the APU Fire Switch ?
unlocks
page 8.10.1
why is the APU Fire Switch mechanically locked when in the IN normal position ?
to prevent inadeverted shutdown of the APU
page 8.10.2
what happens when the APU Fire Switch is pulled into the UP position ?
- arms APU extinguisher circuit
- closes fuel shutoff valve, APU bleed air valve, and APU inlet door
- trips generator control relay and breaker
- allows APU fire switch to rotate
page 8.10.2
how do you discharge the APU Fire Bottle ?
by rotating either left or right
page 8.10.2
what causes the Engine Fire Switch to illuminate red ?
fire in related engine
page 8.10.2
when the Engine Fire Switch illuminates red a fire in the related Engine has been detected, what happens to the Engine Fire Switch ?
unlocks
page 8.10.2
why is the Engine Fire Switch mechanically locked when in the IN normal position ?
to prevent inadeverted shutdown of the engine
8.10.2
what happens when the Engine Fire Switch is pulled into the UP position ?
- arms one discharge squib on each engine fire extinguisher
- closes fuel, hydraulic shutoff and engine bleed air valves
- disables thrust reverser
- trips generator control relay and breaker
- deactivates engine driven hydraulic pump LOW PRESSURE light
- allows engine fire switch to rotate
page 8.10.2
what doe the Fire Switch Override do ?
unlocks fire switch by pushing
page 8.10.3
what does the ENG OVERHEAT Amber light indicate ?
overheat in related engine
page 8.10.3
what does it indicate when with the overheat detector in NORMAL the FAULT Amber light illuminate ?
both detectors loops for an engine have failed
page 8.10.3
what does it mean when with the overheat detector switch in A or B the FAULT Amber light illuminates ?
selected loop for an engine has failed
page 8.10.3
what does indicate when the WHEEL WELL red Fire Warning Light illuminates ?
indicates fire in the main gear wheel well
page 8.10.4
what does indicate when the Engine BOTTLE DISCHARGE Amber Light illuminates ?
related fire exstinguisher bottle has discharged
page 8.10.4
what does indicate when the APU DET INOP Amber Light illuminate ?
APU detector loop has failed
page 8.10.4
what does indicate when the EXT TEST Light illuminate green ?
EXT TEST swotch is positioned to 1 or 2 and circuit continuity is normal
page 8.10.4
when does the EXT Test Light illuminate green and what does this mean ?
- cargo fire test switch is pushed
- fire bottle discharge squib cuircuit continuity is normal
page 8.10.4
when the DET SELECT Switch is on NORMAL which loop is active ?
both A and B
page 8.10.4
what causes the DETECTOR FAULT Amber Light to illuminate ?
one or more of the selected loops in either cargo compartment has failed
page 8.10.5
what is the aim of using the Cargo Fire TEST Switch ?
to test the circuits of the:
-fire detector loops
and
- suppression system (exstinguisher bottle squib circuit)
for both forward and aft cargo compartment
page 8.10.5
what happens when pushing the Cargo Fire ARM Switch for either the FWD or AFT cargo compartment ?
exstinguisher is arm
page 8.10.5
what does it mean when the Cargo Fire (FWD/AFT) Warning Lights illuminate red ?
- at least one detector in each loop detects smoke
(with power failed in one loop, at least one detector on the remaining loop detects smoke)
page 8.10.5
what is an indication of when the Cargo Fire Bottle DISCH Amber light illuminates ?
exstinguisher bottle has discharged
page 8.10.5
what happens after pushing the Cargo Fire DISCH Switch ?
discherges the exstinguisher bottle
(if armed)
page 8.10.5
what causes the Master FIRE WARN Light to illuminate red ?
indicates:
- system test
or
- fire warning in the:
engine, APU, main gear wheel well or cargo compartment
when the Master FIRE WARN red light illuminates is this accompanied by an aural alarm ?
YES
- the fire warning bell sounds
- on the ground only , APU fire warning horn sounds
pae 8.10.6
what happens after the Master FIRE WARn light is pushed ?
- extinguishes both master FIRE WARN lights
- silences fire warning bell
- silences remote APU fire warning horn
- resets system for additional warnings
page 8.10.6
when pushing the Master FIRE WARN Lights:
- extinguishes both master FIRE WARN lights
- silences fire warning bell
- silences remote APU fire warning horn
- resets system for additional warnings
what else can be pushed to result in the same actions ?
pushing the fire BELL CUTOUT switch on the OVRHT/FIRE PROTECTION Panel
page 8.10.6
is the APU BOTTLE DISCHERGE Switch sping-loaded ?
YES
page 8.10.6
do you have to push the switch left or right to discharge the APU exstinguisher ?
LEFT
page 8.10.6
what is the normal position of the APU Fire Control Handle, Up or Down ?
UP
page 8.10.6
what happens when you push the APU Fire Control Handle DOWN ?
- arms APU BOTTLE DISCHARGE switch (on this panel only)
- closes APU fuel shutoff, bleed air valve and APU inlet door
- trips generator control relay and breaker
page 8.10.7
what happens pushing the APU Fire Warning HORN CUTOUT Switch ?
- silences fire alarm bell
- silences APU fire warning horn
- causes APU fire warning light to stop flashing but remain illuminated
page 8.10.7
what causes the APU Fire Warning Light to illuminate FLASHING RED ?
indicates fire in the APU
page 8.10.7
what causes the APU Fire Warning Light to illuminate RED STEADY ?
APU fire warning HORN CUTOUT switch has been pushed
(following an APU fire indication)
page 8.10.7
when does the TEMPERATURE INDICATOR placard turn Black ?
when exposed to high temperatures
page 8.10.8
what does it mean when the Heat Activated Nozzles are either Flat Black or Aluminum ?
Flat Black - normal condition
Aluminum - extinguisher has discharged
page 8.10.8
what is protected by Fire Dection System and Fire Exstinguishing System ?
- engines
- APU
- cargo compartment
- lavatory
page 8.20.1
there is fire protection and exstinguishing system for engine, APU, cargo compartment and lavatory, which one amog those also have a Overheat Detection System ?
engines
page 8.20.1
What part of the plane is protected by a Fire Detection System but does not have a Fire Exstinguishing System ?
Main Wheel Well
page 8.20.1
what powers the engine overheat and fire protection system of the engines ?
Battery Bus
page 8.20.1
what powers the engine fire exstinguishing system of the engines ?
Hot Battery Bus
page 8.20.1
how many overheat/fire detector loops does each engine contains ?
two
page 8.20.1
describe the process from sensin overheat to detecting fire in the engine ?
As the temperature of a detector increases to a predetermined limit, the detector senses an overheat condition. At higher temperatures, the detector senses a fire condition
page 8.20.1
normally, how many loops are needed to sense a fire or an overheat ?
two
page 8.20.1
until when does the ENG OVERHEAT Light and Fire Switch remain illuminated ?
until the temperature drops below the onset temperature
page 8.20.1
what happens if the OVHT DET switch in on NORMAL and one loop fails ?
that loop is automatically deselected and the remaining loop functions as a single loop detector
page 8.20.1
when a single loop fail is there any indication about it in the flight deck ?
NO
page 8.20.1
if both loops fail on a engine what is the indication in the flight deck ?
FAULT light illuminate
(system is inoperative)
when you position the OVHT DET switch to either A or B the system is operating as a single loop system, is the other loop monitored ?
NO
page 8.20.1
when you position the OVHT DET switch to either A or B the system is operating as a single loop system, and the other loop is not monitored, what if a FAULT light illuminate would the failed loop revert to the non failed loop ?
NO
because we operating single loop and the other one is out of the equation therefore there will be a total system faliure
page 8.20.1
what are the indications of an engine overheat ?
- both MASTER CAUTION lights illuminate
- the OVHT/DET system annunciator light illuminates
- the related ENG OVERHEAT light illuminates
what are the indications of an engine fire ?
- the fire warning bell sounds
- both master FIRE WARN lights illuminate
- the related engine fire switch illuminates
- all related engine overheat alert indications illuminate
page 8.20.2
what does the engine fire exstinguishing system consist of ?
- two engine fire extinguisher bottles,
- two engine fire switches,
- two BOTTLE DISCHARGE lights,
- one EXT TEST switch
page 8.20.2
usually the engine fire switches are unlocked once the Engine Fire Switch or ENG OVHT light illuminates, can they be unlocked manually as well ?
YES
page 8.20.2
Pulling the engine fire switch up…
- closes both the engine fuel shutoff valve and the spar fuel shutoff valve
- closes the engine bleed air valve resulting in loss of wing anti–ice to the affected wing and closure of bleed air operated pack valve
- trips the generator control relay and breaker
- closes the hydraulic fluid shutoff valve. The engine driven hydraulic pump LOW PRESSURE light is deactivated
- disables thrust reverser for the related engine.
- allows the engine fire switch to be rotated for discharge
- arms one discharge squib on each engine fire extinguisher bottle
page 8.20.2
rotating the engine fire switch …
…electrically “fires” a squib, discharging the extinguishing agent into the related engine
page 8.20.2
roatating the engine fire switch toward one side electrically “fires” a squib, discharging the extinguishing agent into the related engine, what happens if after you rotate the switch to the opposite side ?
discharges the remaining bottle
page 8.20.2
descirbe the engine fire exstinguisher schematic
look at picture
what is the APU fire dection powered by ?
Battery Bus
page 8.20.4
what is the APU fire exstinguisher powered by ?
Hot Battery Bus
page 8.20.4
does the APU have a double or single fire detection loop ?
single
page 8.20.4
explain how a fire condition is detected in the APU ?
As the temperature of the detector increases to a predetermined limit, the detector senses a fire condition
page 8.20.4
until what does the APU fire switch remains illuminated ?
until the temperature of the detector has decreased below the onset temperature
page 8.20.4
what happens if the APU loop fails ?
the APU DET INOP light illuminates indicating the system is inoperative
page 8.20.4
what are the indication of an APU fire ?
- the fire warning bell sounds
- both master FIRE WARN lights illuminate
- the APU fire switch illuminates
- the APU automatically shuts down
- the wheel well APU fire warning horn sounds, (on the ground only), and the wheel well APU fire warning light flashes
page 8.20.4
what does the APU fire exstinguisher system consist of ?
- one APU fire extinguisher bottle,
- one APU fire switch,
- one APU BOTTLE DISCHARGE light,
- one EXT TEST switch
page 8.20.4
where is the APU ground control panel located ?
right main wheel well
page 8.20.4
what does the APU ground control panel contain ?
- one APU fire warning light,
- one APU BOTTLE DISCHARGE switch,
- one APU fire control handle
- one APU HORN CUTOUT switch
page 8.20.4
illumination of the APU fire switch automatically unlocks the switch, can it be unlocked manually as well ?
YES
page 8.20.4
pulling the APU fire switch UP …
- provides backup for the automatic shutdown feature
- deactivates the fuel solenoid and closes the APU fuel shutoff valve
- closes the APU bleed air valve
- closes the APU air inlet door
- trips the APU generator control relay and breaker
- allows the APU fire switch to be rotated for discharge
- arms the APU fire extinguisher bottle squib
page 8.20.4
which way does the APU fire switch has to be rotate to electrically fire the squib to discharge the exstinguishing agent into the APU ?
either way
page 8.20.4
what is the main wheel well fire protection powered by ?
No.2 AC Transfer Bus
page 8.20.5
does the main wheel well have a fire exstinguisher system ?
NO
page 8.20.5
how many fire loops doest the wheel well fire detection system have ?
only one
page 8.20.5
briefly explain how the wheel well fire detection system works ?
As the temperature of the detector increases to a predetermined limit, the detector senses a fire condition
page 8.20.5
until when does the wheel well fire warning light remains illuminated ?
until the temperature of the detector has decreased below the onset temperature
page 8.20.5
what are the indication for a Main Wheel Well fire ?
- the fire warning bell sounds
- both master FIRE WARN lights illuminate
- the WHEEL WELL fire warning light illuminates
page 8.20.5
which system does the Cargo Fire Protection consist of ?
- smoke detection
- fire exstinguisher
page 8.20.5
what poweres the smoke detection system of the cargo compartment ?
DC Bus 1, DC Bus 2
page 8.20.5
what powers the fire exstinguishing system of the cargo compartment ?
Hot Battery Bus
page 8.20.5
do both AFT and FWD cargo comparment have smoke detectors ?
YES
page 8.20.5
are the smoke detectors in the cargo compartmente a single or dual loop system ?
dual loop
page 8.20.5
normally two loops are needed to detect smoke, what do you need to do if one fails ?
manually convert to single loop detection
(through the DETECT SELECT switch)
page 8.20.5
in the event of a power faliure of one of the detector loops what would happen ?
the system automatically converts to signle loop detection
page 8.20.5
what is the different in respond to a loop detector failure to a loop power faliure ?
detector failure - manually reverts to single loop
power failure - automatically reverts to single loop
page 8.20.5
what are the indications of a fire in the cargo compartment ?
- the fire warning bell sounds
- both master FIRE WARN lights illuminate
- the FWD/AFT cargo fire warning light(s) illuminates
page 8.20.6
how many fire exstingushing bottles does the cargo compartment have ?
one
page 8.20.6
where is the single fire exstinguisher bottle installed ?
in the air conditioning mix bay on the forward wing spar
page 8.20.6
how is the exstinguisher of the cargo compartment armed ?
by pushing the appropriate cargo fire ARMED switch
page 8.20.6
pushing the fire ARMED switch arms the fire exstinguisher of the cargo compartment, after that, how is the bottle discharged ?
by pressing the DISCH switch
page 8.20.6
when you press the DISCH switch does this results in the total or partial discharge of the fire exstinguisher bottle ?
total
page 8.20.6
how long can it take for the DISCH light to illuminate once the bottle has been discharged ?
up to 30 sec
page 8.20.6
briefly explain the schematic of the Cargo Fire Exstinguisher ?
look at the picture
page 8.20.6
what does the lavatory fire protection consist of ?
- smoke detection
- fire exstinguishing
page 8.20.6
how is the lavatory fire exstinguisher activated ?
heat activated
page 8.20.6
once smoke is detected in the lavatory how is this indicated ?
- an aural warning sounds
- the red alarm indicator light on the lavatory smoke detector panel illuminates
page 8.20.6
is there any indication of smoke in the lavatory in the flight deck ?
NO
page 8.20.7
once smoke is no longer present in the lavatory how is the ALARM reset ?
by pressing the INTERRUPT switch
page 8.20.7
where is the lavatory fire exstinguisher system located ?
beneath the sink aerea in each lavatory
page 8.20.7
is the lavatory fire exstinguisher operation automatic ?
YES
page 8.20.7
does the flight deck have any indication of discharge of the fire exstinguisher ?
NO
page 8.20.7
what are the indications for the FAULT/INOP test ?
- both MASTER CAUTION lights illuminate
- the OVHT/DET system annunciator light illuminates
- the FAULT light illuminates
- the APU DET INOP light illuminates
page 8.20.7
what are the indications for the OVHT?FIRE test ?
- the fire warning bell sounds
- both master FIRE WARN lights illuminate
- both MASTER CAUTION lights illuminate
- the OVHT/DET system annunciator light illuminates
- both engine fire switches illuminate
- the APU fire switch illuminates
- both ENG OVERHEAT lights illuminate
- the WHEEL WELL fire warning light illuminates if AC power is available
- on the ground, the wheel well APU fire warning horn sounds and the wheel well APU fire warning light flashes
page 8.20.7
what are the indications for a Cargo Fire Test ?
- the fire warning bell sounds
- both master FIRE WARN lights illuminate
- the extinguisher test lights illuminate
- the FWD and AFT cargo fire warning lights illuminate when all detectors in selected loops (s) respond to the fire test
- the cargo fire bottle DISCH light illuminates
page 8.20.8
