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Compass Systems > Fire Detection > Flashcards

Fire Detection Flashcards

1
Q

What airplane systems have fire detection and protection?

A
  • engine
  • APU
  • cargo compartments
  • lavs
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2
Q

Are the cockpit and cabin protected from fire?

A
  • yes
  • cockpit: 1 handheld halon ext
  • cabin: 2handheld halon/1 handheld h2o/glycol in the aft cabin
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3
Q

How are the engines and APU protected from fire?

A
  • engine 2halon bottles

- APU 1 halon bottle dedicated to just the APU

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4
Q

Can both engine fire bottles be used for one engine?

A

Yes

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5
Q

What is the power source for engine and APU fire detection and protection?

A
  • engine detection——DC ESS
  • engine protection—— HOT BATT
  • APU detection—— DC ESS
  • APU protection——DC ESS
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6
Q

Describe the engine and APU fire detection system?

A
  • engine. 8 pneumatic fire detectors (2 loops) per engine

- APU. 2 pneumatic fire detectors (2 loops)

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7
Q

Describe the fire test?

A

-Press and hold the test button on the overhead panel for a minimum of three seconds, but no more than 10 seconds if the APU is running or it will automatically shut down the APU

-aural warning
Firebell
Triple chime

-visual indications
-OH panel
Fire handle 1
Fire handle 2
Cargo smoke fwd ext button
Cargo smoke aft ext button
APU ext button
APU EMER STOP (top half of button)
-glareshield
Master warning light (left)
Master warning light (right)

-EICAS
    ENG FIRE 1 (cas message)
    ENG FIRE 2 (cas message)
    CARGO FWD SMOKE (cas message)
    CARGO AFT SMOKE (cas message)
    APU FIRE (cas message)
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8
Q

What happens when an engine fire handle is pulled?

A
  • closes respective engine fuel sov
  • closes eng hydraulic sov
  • closes eng bleed sov
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9
Q

What is an indication of an APU Fire?

A
  • fire bell
  • red stripe in the EMER STOP button
  • APU FIRE is displayed on the EICAS
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10
Q

Will the APU automatically shut down if fire is detected?

A

Only on the ground

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11
Q

What happens if the APU EMER STOP button is pushed after a Fire has been detected?

A
  • apu shuts off immediately without a 1 min cool down
  • apu fuel sov closes
  • APU FIRE EXTG button illuminates
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12
Q

What happens if the APU EMER STOP button is not pressed after a Fire has been detected?

A

After one minute the APU FIRE EXT button illuminates

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13
Q

Will the APU fire extinguisher automatically discharge?

A

No

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14
Q

How many smoke detectors are installed in the cargo compartments?

A
  • 3 detectors in the fwd

- 2 detectors in the aft

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15
Q

What happens to the fwd cargo compartment when smoke is detected?

A
  • recirculating fans turn off

- ventilation outflow valve closes

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16
Q

what is the purpose of this (refer to last card)?

A
  • prevents oxygen from entering the compartment

- prevents halon agent from escaping into the plane cabin

17
Q

how many extinguishing bottles are installed for the cargo compartments?

A
  • 2 bottles used for both compartments

- 1 high-rate bottle and 1 low rate bottle

18
Q

what is the difference between the high rate bottle and the low rate bottle

A
  • high rate saturates the compartment immediately

- low rate maintains saturation over a duration of time

19
Q

how long will the low rate bottle remain active in the compartment?

A

60 minutes

20
Q

can one bottle be used for one compartment and the other bottle for the other compartment?

A

No. Only one compartment may be selected (FWD or AFT)

21
Q

What happens when a cargo extinguishing button is pushed if smoke has been detected?

A
  • high rate bottle discharges immediately
  • low rate bottle discharges after one minute if the airplane is in flight
  • if plane is on the ground (WOW) the low rate bottle will NOT automatically discharge
22
Q

during flight can the low rate bottle be discharged before the minute is up?

A

Yes, by pushing the extinguishing button again

23
Q

how can the low rate bottle be discharged if the airplane is on the ground (WOW)?

A

the extinguishing button must be pushed again

24
Q

can cargo extinguishing be used if no smoke is detected?

A
  • Yes. The high rate bottle extinguishing button must be pushed twice, once to arm the bottle and once to discharge the bottle.
  • the low rate bottle automatically discharges after one minute if in flight
25
Q

how are the lavatories protected from fire?

A

heat sensitive extinguishers in the lab waste bins auto discharge if predetermined temp is reached

Compass Systems (5 decks)

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