Fire Protection & Ice and Rain Protection Flashcards
How do the engine fire detection loops work?
sensor tubes are filled with helium gas; as temperature increases the gas expands activating an alarm switch
Name the engine fire detection loop zones.
Leading Edge Zone (LEZ), Primary Engine Zone (PEZ), Main Wheel Well Zone (MWW)
What indicates the PEZ or LEZ loop failed?
FAULT A, CHECK FIRE DETECT, MASTER WARNING
What indicates the MWW loop failed?
FAULT B, CHECK FIRE DETECT, MASTER WARNING
If the LEZ loops fails and the PEZ detects a fire will a fire indication result?
no, will indicate a fault only
What indicates the APU loop failed?
FAULT, CHECK FIRE DETECT, MASTER WARNING
What indicates an engine fire is detected?
PULL/FUEL HYD OFF handle light MASTER WARNING CHECK FIRE DETECT ENGINE FIRE PRESS TO RESET light Fire bell
Number and location of engine fire bottles
two spherical, dual port bottles located in the left wing root
What indicates an engine fire bottle has been depleted or has low pressure?
MASTER WARNING
CHECK FIRE DETECT
BTL LOW
Pulling the PULL FUEL/HYD OFF T handle results in:
fuel shutoff valve closes
hydraulic shutoff valve closes
FWD and AFT fire bottles arm
Engine fire detection system test lights
PULL FUEL/HYD OFF handle MASTER WARNING CHECK FIRE DETECT ENGINE FIRE PRESS TO RESET FAULT A and FAULT B Fire bell
Number and location of smoke detectors
4, one located above door in fwd baggage compartment, two located on the ceiling of the aft baggage compartment, one located in lavatory
Forward baggage compartment smoke and test indication
MASTER WARNING
SMOKE
baggage fwd SMOKE/EXTG switchlight
FIRE BOTTLE FWD BOTTLE ARM
Describe the forward baggage compartment fire extinguishing system.
one high rate discharge fire extinguisher bottle installed above fwd baggage compartment, one shared low rate discharge fire extinguisher bottle located in tail section, discharge simultaneously and provide 45 minutes of suppression
Aft baggage compartment smoke and test indication
MASTER WARNING SMOKE baggage aft SMOKE/EXTG switchlight FIRE BOTTLE AFT BOTTLE ARM VENT INLT and VELT OTLT CLOSED
Describe the aft baggage compartment fire extinguishing system.
one high rate discharge fire extinguisher bottle installed above the aft baggage compartment discharges, one shared low rate discharge fire extinguisher bottle located in tail section discharges approximately seven minutes later and provides 45 minutes of suppression
Describe the lavatory fire protection.
lavatory waste bin is equipped with a thermally-activated fire extinguisher bottle mounted in the roof of the waste bin, end caps melt off during fire to discharge into bin
SMOKE warning light
smoke in baggage area
CHECK FIRE DETECT warning light
engine or APU fire or detector loop malfunction
Heated components include:
leading edges of propeller blades
left, right, and standby pitot/static probes
left and right Angle of Attack (AOA) vanes
left and right engine intake flanges
left and right windshield panels and Captain’s side window
How do the ice detection probes work?
via the “piezoelectric” principle, probes continuously vibrate at a natural resonant frequency and when ice accumulates the frequency increases
Airframe deice system pressure is regulated to:
18 psi
What controls the inflation and deflation of the deice boot sets?
6 Dual Distribution Valves (DDVs)
When are the DDVs heated?
automatically whenever the SAT is below 5C or the airframe mode selector is in MANUAL
What is the purpose of the BOOT AIR ISO switch?
checking the integrity of each side of the system individually, or to isolate the left and right sides of the airframe deicing system in the even of a system pressure leak
How long is the deicing boot cycle in SLOW?
144 seconds (3 minutes); 6 seconds per combination of boots; 36 second on, 108 second dwell time
How long is the deicing boot cycle in FAST?
60 seconds (one minute); 6 seconds per combination of boots; 36 seconds on, 24 second dwell time
What is “adequate” pressure for boot inflation?
approximately 15.5 psi
Identical left and right Timer Monitor Control Units (TMCU) perform the following functions for their respective propellers:
monitor propeller speed
monitor SAT
monitor the propeller deicing system for faults
control the timing and distribution of heating power to respective propeller (to provide adequate ice shedding under varying atmospheric conditions)
PROP Select Switch ON
will activate the propeller deicing system provided that SAT is at or below 5C and propeller speed is greater than 400 rpm
PROPS Select Switch TEST
will activate an automatic test sequence during which the propeller heaters are cycled through a sequence for a period of 7 seconds a piece given that the prop speed is greater than 400 rpm (30 second cooling period must be observed between tests)
PROP DEICE caution light
failure of the left or right propeller TMCU or a malfunction in the left or right propeller heating system
Which pitot/static probe uses DC power for heat?
standby
The engine intake heaters are automatically activated under the following conditions:
engine intake bypass door is open AND
engine is running (oil pressure sensor) AND
SAT is below approximately 15C AND
115 volt variable AC power is available
Windshield heat ambient temperature limit
> 20C
DEICE PRESS caution light
airframe deice system pressure is too low for deicer boot operation
DEICE TIMER caution light
timer and monitor unit malfunction
ENG ADPT HEAT 1 or 2 caution light
malfunction of both engine heating elements
PITOT HEAT 1 or 2 caution light
PITOT/STATIC PORT heater toggle switch set to OFF or pitot/static port heater malfunction
ICE DETECT FAIL caution light
ice detectors have malfunctioned
SIDE WDO HOT caution light
pilot’s side window temperature is more than 52C
WSHLD HOT caution light
windshield temperature is more than 50C
WSHLD CTRL caution light
preset threshold temperature is not reached within five minutes of selecting windshield heat ON
PITOT HEAT STBY caution light
PITOT/STATIC PORTS STBY toggle switch set to OFF or pitot/static port heater malfunction
