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Boeing 747 > Fire Protection > Flashcards

Fire Protection Flashcards

1
Q

When do Engine Fire Handles Unlock?

A

Mechanically unlock when:

  • engine fire warning
  • Fuel Control switch to Cutoff
  • override switch pushed
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2
Q

What happens when you pull Engine Fire Switch?

A
  • 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
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3
Q

What happens when you pull APU Fire Switch?

A
  • 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)
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4
Q

What happens when you push FWD(AFT) Cargo Fire Arm switch (PAX)?

A
  • 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
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5
Q

How long to fire extinguishing agents discharge into cargo department?

A

195 or 215 minutes (pax)

210 or 334 minutes (freight)

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6
Q

What happens when you push MAIN or FWD(AFT) Cargo Fire Arm switch (freight)?

A

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
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7
Q

FIRE/OVHT TEST switch tests which areas?

A

Engine, APU, wheel well, cargo , bleed duck leak detectors

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8
Q

What happens when APU Fire is detected?

A
  • 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
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9
Q

Which areas have fire detection?

A
  • Engines
  • APU
  • Main Deck Cargo
  • Lower Cargo compartments
  • lavatories
  • main gear wheel wells (no fire extinguishing)
  • rest areas (no fire extinguishing)
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10
Q

Which lights illuminate if a fire is detected?

A
  • both Master Warning lights ( can be reset by pushing)
  • respective Engine, APU, or Cargo Fire Warning Lights
  • respective Engine Fuel Control switch
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11
Q

How is Engine Fire/Overheat detected?

A
  • 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

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12
Q

How is APU Fire detected?

A
  • dual loop fire detection in APU compartment
  • only one loop detection needed to activate APU fire warning and shutdown APU
  • no overheat detection
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13
Q

How many fire detectors in Cargo Compartment?

A

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
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14
Q

How is smoke detected in Crew Rest or Lavatories?

A
  • smoke detectors installed in crew rest areas and lavatories ?

Crew rest:
- aural warning

Lavatories:

  • aural warning
  • auto fire extinguisher activated in waste compartment
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15
Q

How many fire bottles for Engines and APU?

A

4 x engines (2 per wing, can be used in either engine in respective wing)
1 x APU

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16
Q

How many fire bottles for lower cargo compartments?

A

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
17
Q

How does the compression system work on the Cargo Main Deck?

A
  • 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
18
Q

How is the FIRE/OVERHEAT Detection System tested for faults?

A

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
19
Q

Pressing FIRE/OVHT TEST Switch

A
  • 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)

20
Q

Which areas have Fire Extinguishing capability?

A
  • Engines
  • APU
  • Lower Cargo compartments
  • lavatory
21
Q

> CGO BTL DISCH EICAS message

A

Both rapid discharge fire extinguisher pressures are low

22
Q

CARGO FIRE DEPRESS/DISCH switch

A

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

23
Q

What type of detectors for fire cargo?

A

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)
24
Q

What Class is Main Cargo Deck?

A

Class E - no fire extinguishing

25
Q

How many overheat detector loops in wheel well?

A
  • single loop detector

Boeing 747 (21 decks)

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