Fire Protection Flashcards
When do Engine Fire Handles Unlock?
Mechanically unlock when:
- engine fire warning
- Fuel Control switch to Cutoff
- override switch pushed
What happens when you pull Engine Fire Switch?
- closes spar fuel valve
- closed engine fuel valve
- closes engine bleed valve
- trips engine generator
- turns off engine hydraulic pump
- depressurize hydraulic pump
- arms fire extinguishers
What happens when you pull APU Fire Switch?
- arms APU fire extinguisher bottle
- closes APU fuel valve
- closes APU bleed air valve
- closes APU air inlet door
- trips APU generator
- shuts down APU (if not automatically shutdown)
What happens when you push FWD(AFT) Cargo Fire Arm switch (PAX)?
- arms cargo fire extinguishers
- equipment cooling to override
- turns off airflow to FWD compartment
- turns off AFT Cargo Heat (AFT Fire)
- turns off pack 3 and all fans
How long to fire extinguishing agents discharge into cargo department?
195 or 215 minutes (pax)
210 or 334 minutes (freight)
What happens when you push MAIN or FWD(AFT) Cargo Fire Arm switch (freight)?
MAIN DECK:
- enables (arms) main deck fire suppression
- turns off two packs (pack 2 and 3)
- equipment cooling closed loop
- turns off airflow to main deck and lower cargo
- turns off heat to lower cargo
- closes master trim valve
FWD (AFT):
- turns off two packs (pack 2 and 3)
- arms lower cargo fire extinguishers
- equipment cooling override mode
- turns off airflow and heat to lower cargo
- closes master trim valves
FIRE/OVHT TEST switch tests which areas?
Engine, APU, wheel well, cargo , bleed duck leak detectors
What happens when APU Fire is detected?
- APU automatically shuts down
- Fire Bell (cockpit)
- FIRE APU EICAS Message
- APU Fire Warning light illuminates (cockpit)
- APU Fire light illuminates (GND Control Panel)
- APU Fire Warning Horn initiates (GND)
- Fire extinguisher auto discharges on the ground
Which areas have fire detection?
- Engines
- APU
- Main Deck Cargo
- Lower Cargo compartments
- lavatories
- main gear wheel wells (no fire extinguishing)
- rest areas (no fire extinguishing)
Which lights illuminate if a fire is detected?
- both Master Warning lights ( can be reset by pushing)
- respective Engine, APU, or Cargo Fire Warning Lights
- respective Engine Fuel Control switch
How is Engine Fire/Overheat detected?
- dual loop (A and B) fire detection in each engine nacelle
- dual loop (A and B) overheat detection in each engine nacelle
*both loops need to detect fire/overheat for warning/caution to be activated
How is APU Fire detected?
- dual loop fire detection in APU compartment
- only one loop detection needed to activate APU fire warning and shutdown APU
- no overheat detection
How many fire detectors in Cargo Compartment?
Pax:
- dual loop smoke detectors in each compartment
- both loops must detect smoke
Cargo:
- FWD and AFT lower cargo departments have 4 x dual loop smoke detectors
- Main Deck Cargo has 16 x dual loop smoke detectors
- both loops must detect smoke
- sample air from center bleed duct
How is smoke detected in Crew Rest or Lavatories?
- smoke detectors installed in crew rest areas and lavatories ?
Crew rest:
- aural warning
Lavatories:
- aural warning
- auto fire extinguisher activated in waste compartment
How many fire bottles for Engines and APU?
4 x engines (2 per wing, can be used in either engine in respective wing)
1 x APU
How many fire bottles for lower cargo compartments?
PAX and Freight:
- 4 bottles for FWD and AFT
- 2 bottles are released immediately when FIRE CARGO DISCH is pushed; other 2 release after a delay or after touchdown
400C:
- 6 bottles for FWD and AFT
- 2 bottles are released immediately when FIRE CARGO DISCH is pushed; other 4 release after a delay or after touchdown
How does the compression system work on the Cargo Main Deck?
- system is armed by pushing MAIN DECK CARGO FIRE ARM switch
- equipment cooling goes into closed loop
- two packs are turned off
- airflow is cutoff to all cargo compartments
- closes master trim air valve
- pressing CARGO FIRE DEPRESS
- initiates controlled cabin decompression
- both outflow valves are commanded open
How is the FIRE/OVERHEAT Detection System tested for faults?
Automatically or Manually
Automatically:
- engine detector loops are continuously monitored
- all other dual loop detectors are tested when electricity is initially applied
- when a detector loop senses a fire
- every 60 mins in single loop operation
Manually
- pushing FIRE/OVHT TEST switch
- wheel well fire detector loops and bleed duck leak detector loops only tested during manual test
Pressing FIRE/OVHT TEST Switch
- fire bells
- APU Fire Warning horn (on the ground)
- TEST IN PROG on EICAS
- Master Warning Lights
- Engine Fire Warning Lights
- APU Fire Warning Lights
- FWD and AFT Cargo Fire Warning Lights
- Fuel Control switch Fire Warning Lights
- Main Deck Fire Warning (Freight)
*main deck shutoff valve and Pack 1 and 3 dump valve test initiates after FIRE/OVHT Test (freight)
Which areas have Fire Extinguishing capability?
- Engines
- APU
- Lower Cargo compartments
- lavatory
> CGO BTL DISCH EICAS message
Both rapid discharge fire extinguisher pressures are low
CARGO FIRE DEPRESS/DISCH switch
MAIN: initiates a controlled cabin depressurization
FWD/AFT: Discharges bottles to ARMED cargo compartment
* Discharge 2 bottles immediately, remaining 2 after brief delay or after landing
What type of detectors for fire cargo?
FWD and LWR Cargo - four dual loop smoke detectors each (8 total)
Main Deck - Sixteen dual loop smoke detectors
- Both loops must sense smoke unless in single loop operation
- sample air from each compartment is drawn through through detectors by center bleed duct air (jet pumps are used)
What Class is Main Cargo Deck?
Class E - no fire extinguishing
How many overheat detector loops in wheel well?
- single loop detector
