Smoke/Fire Flashcards
Where are the engine fire detection sensing elements located?
Accessory gear box
Engine core
Fixed cowl
What must happen to activate the fire warning system?
Both paired loops in a section must sense heat
If only one loop is operative, only that loop is needed to activate the FIRE warning
What extinguishing agent is used in the fire bottles?
Halon
During an engine fire, what warning indications come on?
The respective L or R ENG FIRE PBA illuminates
Red L or R ENG FIRE CAS
FIRE icon in the N1 gauge
Aural warning voice message, “Left (or Right) Engine Fire”
Master Warning PBA flashes red on glare shield
What six events occur when the L/R ENG FIRE PBA is pressed?
Firewall fuel SOV closes
Engine PRSOV closes
Hydraulic SOV closes
Generator is taken offline
BTL 1 and 2 PBAs illuminate green AVAIL to indicate armed
Ignition is disabled
What happens when the APU FIRE PBA is pressed?
APU firewall fuel SOV closes
APU fuel control unit shuts off the fuel
APU generator is taken off line
APU Bleed Control Valve (BCV) is closed
BTL 2 squib armed, AVAIL green PBA comes ON
Does pressing the ENG FIRE PBA command an immediate engine shutdown?
No; the fire PBA closes the fuel feed SOV at the firewall, the engine will run for up to 20
seconds to empty the fuel line
Immediate shutdown is via the ENGINE RUN switch per the checklist
If an APU fire is detected on the ground, what is the automatic shutdown and extinguishing sequence
of events? (FCOM2, APU)
APU fire warning horn sounds outside of the airplane
APU BCV closes
FIDEEX triggers APU shutdown
Within 10 seconds of detection, BTL 2 discharges
May the APU be left unattended? (FCOM2, APU Chapter)
Yes
How is fire detection/suppression for the baggage compartment provided?
Smoke detectors
BTL 1 can be discharged into the baggage compartment
