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B737 > fire protection > Flashcards

fire protection Flashcards

1
Q

when the OVHT DET switch is on Normal are both Loop A and B active ?

A

YES

pae 8.10.1

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2
Q

can you select a single Loop via the OVHT DET switch ? How ?

A

YES

by selecting either A or B

page 8.10.1

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3
Q

what happens when you push the Fire Warning BELL CUT OUT Switch ?

A
  • extinguishes both master FIRE WARN lights
  • silences the fire warning bell
  • silences the remote APU fire warning horn (on the -ground only)
  • resets the system for additional warnings

page 8.10.1

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4
Q

what is the EXT TEST Switch used for ?

A

to test bottle discharge system continuity for all 3 extinguisher bottles

(L and R engine and APU)

page 8.10.1

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5
Q

what does the FAULT/INOP and OVERHT/FIRE TEST switch do when switched to the FAULT/INOP side ?

A

tests fault detection circuits for both engines and the APU

page 8.10.1

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6
Q

what does the FAULT/INOP and OVERHT/FIRE TEST switch do when switched to the OVERHT/FIRE side ?

A

tests overheat and fire detection loops on:

  • both engines
  • APU
  • wheel well fire detector

page 8.10.1

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7
Q

what causes the APU Fire Switch to illuminate red ?

A

fire in the APU

page 8.10.1

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8
Q

when the APU Fire Switch illuminates red a fire in the APU has been detected, what happens to the APU Fire Switch ?

A

unlocks

page 8.10.1

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9
Q

why is the APU Fire Switch mechanically locked when in the IN normal position ?

A

to prevent inadeverted shutdown of the APU

page 8.10.2

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10
Q

what happens when the APU Fire Switch is pulled into the UP position ?

A
  • arms APU extinguisher circuit
  • closes fuel shutoff valve, APU bleed air valve, and APU inlet door
  • trips generator control relay and breaker
  • allows APU fire switch to rotate

page 8.10.2

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11
Q

how do you discharge the APU Fire Bottle ?

A

by rotating either left or right

page 8.10.2

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12
Q

what causes the Engine Fire Switch to illuminate red ?

A

fire in related engine

page 8.10.2

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13
Q

when the Engine Fire Switch illuminates red a fire in the related Engine has been detected, what happens to the Engine Fire Switch ?

A

unlocks

page 8.10.2

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14
Q

why is the Engine Fire Switch mechanically locked when in the IN normal position ?

A

to prevent inadeverted shutdown of the engine

8.10.2

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15
Q

what happens when the Engine Fire Switch is pulled into the UP position ?

A
  • arms one discharge squib on each engine fire extinguisher
  • closes fuel, hydraulic shutoff and engine bleed air valves
  • disables thrust reverser
  • trips generator control relay and breaker
  • deactivates engine driven hydraulic pump LOW PRESSURE light
  • allows engine fire switch to rotate

page 8.10.2

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16
Q

what doe the Fire Switch Override do ?

A

unlocks fire switch by pushing

page 8.10.3

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17
Q

what does the ENG OVERHEAT Amber light indicate ?

A

overheat in related engine

page 8.10.3

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18
Q

what does it indicate when with the overheat detector in NORMAL the FAULT Amber light illuminate ?

A

both detectors loops for an engine have failed

page 8.10.3

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19
Q

what does it mean when with the overheat detector switch in A or B the FAULT Amber light illuminates ?

A

selected loop for an engine has failed

page 8.10.3

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20
Q

what does indicate when the WHEEL WELL red Fire Warning Light illuminates ?

A

indicates fire in the main gear wheel well

page 8.10.4

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21
Q

what does indicate when the Engine BOTTLE DISCHARGE Amber Light illuminates ?

A

related fire exstinguisher bottle has discharged

page 8.10.4

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22
Q

what does indicate when the APU DET INOP Amber Light illuminate ?

A

APU detector loop has failed

page 8.10.4

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23
Q

what does indicate when the EXT TEST Light illuminate green ?

A

EXT TEST swotch is positioned to 1 or 2 and circuit continuity is normal

page 8.10.4

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24
Q

when does the EXT Test Light illuminate green and what does this mean ?

A
  • cargo fire test switch is pushed
  • fire bottle discharge squib cuircuit continuity is normal

page 8.10.4

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25
Q

when the DET SELECT Switch is on NORMAL which loop is active ?

A

both A and B

page 8.10.4

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26
Q

what causes the DETECTOR FAULT Amber Light to illuminate ?

A

one or more of the selected loops in either cargo compartment has failed

page 8.10.5

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27
Q

what is the aim of using the Cargo Fire TEST Switch ?

A

to test the circuits of the:

-fire detector loops

and

  • suppression system (exstinguisher bottle squib circuit)

for both forward and aft cargo compartment

page 8.10.5

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28
Q

what happens when pushing the Cargo Fire ARM Switch for either the FWD or AFT cargo compartment ?

A

exstinguisher is arm

page 8.10.5

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29
Q

what does it mean when the Cargo Fire (FWD/AFT) Warning Lights illuminate red ?

A
  • at least one detector in each loop detects smoke

(with power failed in one loop, at least one detector on the remaining loop detects smoke)

page 8.10.5

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30
Q

what is an indication of when the Cargo Fire Bottle DISCH Amber light illuminates ?

A

exstinguisher bottle has discharged

page 8.10.5

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31
Q

what happens after pushing the Cargo Fire DISCH Switch ?

A

discherges the exstinguisher bottle

(if armed)

page 8.10.5

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32
Q

what causes the Master FIRE WARN Light to illuminate red ?

A

indicates:

  • system test

or

  • fire warning in the:

engine, APU, main gear wheel well or cargo compartment

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33
Q

when the Master FIRE WARN red light illuminates is this accompanied by an aural alarm ?

A

YES

  • the fire warning bell sounds
  • on the ground only , APU fire warning horn sounds

pae 8.10.6

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34
Q

what happens after the Master FIRE WARn light is pushed ?

A
  • extinguishes both master FIRE WARN lights
  • silences fire warning bell
  • silences remote APU fire warning horn
  • resets system for additional warnings

page 8.10.6

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35
Q

when pushing the Master FIRE WARN Lights:

  • extinguishes both master FIRE WARN lights
  • silences fire warning bell
  • silences remote APU fire warning horn
  • resets system for additional warnings

what else can be pushed to result in the same actions ?

A

pushing the fire BELL CUTOUT switch on the OVRHT/FIRE PROTECTION Panel

page 8.10.6

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36
Q

is the APU BOTTLE DISCHERGE Switch sping-loaded ?

A

YES

page 8.10.6

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37
Q

do you have to push the switch left or right to discharge the APU exstinguisher ?

A

LEFT

page 8.10.6

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38
Q

what is the normal position of the APU Fire Control Handle, Up or Down ?

A

UP

page 8.10.6

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39
Q

what happens when you push the APU Fire Control Handle DOWN ?

A
  • arms APU BOTTLE DISCHARGE switch (on this panel only)
  • closes APU fuel shutoff, bleed air valve and APU inlet door
  • trips generator control relay and breaker

page 8.10.7

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40
Q

what happens pushing the APU Fire Warning HORN CUTOUT Switch ?

A
  • silences fire alarm bell
  • silences APU fire warning horn
  • causes APU fire warning light to stop flashing but remain illuminated

page 8.10.7

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41
Q

what causes the APU Fire Warning Light to illuminate FLASHING RED ?

A

indicates fire in the APU

page 8.10.7

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42
Q

what causes the APU Fire Warning Light to illuminate RED STEADY ?

A

APU fire warning HORN CUTOUT switch has been pushed

(following an APU fire indication)

page 8.10.7

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43
Q

when does the TEMPERATURE INDICATOR placard turn Black ?

A

when exposed to high temperatures

page 8.10.8

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44
Q

what does it mean when the Heat Activated Nozzles are either Flat Black or Aluminum ?

A

Flat Black - normal condition

Aluminum - extinguisher has discharged

page 8.10.8

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45
Q

what is protected by Fire Dection System and Fire Exstinguishing System ?

A
  • engines
  • APU
  • cargo compartment
  • lavatory

page 8.20.1

46
Q

there is fire protection and exstinguishing system for engine, APU, cargo compartment and lavatory, which one amog those also have a Overheat Detection System ?

A

engines

page 8.20.1

47
Q

What part of the plane is protected by a Fire Detection System but does not have a Fire Exstinguishing System ?

A

Main Wheel Well

page 8.20.1

48
Q

what powers the engine overheat and fire protection system of the engines ?

A

Battery Bus

page 8.20.1

49
Q

what powers the engine fire exstinguishing system of the engines ?

A

Hot Battery Bus

page 8.20.1

50
Q

how many overheat/fire detector loops does each engine contains ?

A

two

page 8.20.1

51
Q

describe the process from sensin overheat to detecting fire in the engine ?

A

As the temperature of a detector increases to a predetermined limit, the detector senses an overheat condition. At higher temperatures, the detector senses a fire condition

page 8.20.1

52
Q

normally, how many loops are needed to sense a fire or an overheat ?

A

two

page 8.20.1

53
Q

until when does the ENG OVERHEAT Light and Fire Switch remain illuminated ?

A

until the temperature drops below the onset temperature

page 8.20.1

54
Q

what happens if the OVHT DET switch in on NORMAL and one loop fails ?

A

that loop is automatically deselected and the remaining loop functions as a single loop detector

page 8.20.1

55
Q

when a single loop fail is there any indication about it in the flight deck ?

A

NO

page 8.20.1

56
Q

if both loops fail on a engine what is the indication in the flight deck ?

A

FAULT light illuminate

(system is inoperative)

57
Q

when you position the OVHT DET switch to either A or B the system is operating as a single loop system, is the other loop monitored ?

A

NO

page 8.20.1

58
Q

when you position the OVHT DET switch to either A or B the system is operating as a single loop system, and the other loop is not monitored, what if a FAULT light illuminate would the failed loop revert to the non failed loop ?

A

NO

because we operating single loop and the other one is out of the equation therefore there will be a total system faliure

page 8.20.1

59
Q

what are the indications of an engine overheat ?

A
  • both MASTER CAUTION lights illuminate
  • the OVHT/DET system annunciator light illuminates
  • the related ENG OVERHEAT light illuminates
60
Q

what are the indications of an engine fire ?

A
  • the fire warning bell sounds
  • both master FIRE WARN lights illuminate
  • the related engine fire switch illuminates
  • all related engine overheat alert indications illuminate

page 8.20.2

61
Q

what does the engine fire exstinguishing system consist of ?

A
  • two engine fire extinguisher bottles,
  • two engine fire switches,
  • two BOTTLE DISCHARGE lights,
  • one EXT TEST switch

page 8.20.2

62
Q

usually the engine fire switches are unlocked once the Engine Fire Switch or ENG OVHT light illuminates, can they be unlocked manually as well ?

A

YES

page 8.20.2

63
Q

Pulling the engine fire switch up…

A
  • closes both the engine fuel shutoff valve and the spar fuel shutoff valve
  • closes the engine bleed air valve resulting in loss of wing anti–ice to the affected wing and closure of bleed air operated pack valve
  • trips the generator control relay and breaker
  • closes the hydraulic fluid shutoff valve. The engine driven hydraulic pump LOW PRESSURE light is deactivated
  • disables thrust reverser for the related engine.
  • allows the engine fire switch to be rotated for discharge
  • arms one discharge squib on each engine fire extinguisher bottle

page 8.20.2

64
Q

rotating the engine fire switch …

A

…electrically “fires” a squib, discharging the extinguishing agent into the related engine

page 8.20.2

65
Q

roatating the engine fire switch toward one side electrically “fires” a squib, discharging the extinguishing agent into the related engine, what happens if after you rotate the switch to the opposite side ?

A

discharges the remaining bottle

page 8.20.2

66
Q

descirbe the engine fire exstinguisher schematic

A

look at picture

67
Q

what is the APU fire dection powered by ?

A

Battery Bus

page 8.20.4

68
Q

what is the APU fire exstinguisher powered by ?

A

Hot Battery Bus

page 8.20.4

69
Q

does the APU have a double or single fire detection loop ?

A

single

page 8.20.4

70
Q

explain how a fire condition is detected in the APU ?

A

As the temperature of the detector increases to a predetermined limit, the detector senses a fire condition

page 8.20.4

71
Q

until what does the APU fire switch remains illuminated ?

A

until the temperature of the detector has decreased below the onset temperature

page 8.20.4

72
Q

what happens if the APU loop fails ?

A

the APU DET INOP light illuminates indicating the system is inoperative

page 8.20.4

73
Q

what are the indication of an APU fire ?

A
  • the fire warning bell sounds
  • both master FIRE WARN lights illuminate
  • the APU fire switch illuminates
  • the APU automatically shuts down
  • the wheel well APU fire warning horn sounds, (on the ground only), and the wheel well APU fire warning light flashes

page 8.20.4

74
Q

what does the APU fire exstinguisher system consist of ?

A
  • one APU fire extinguisher bottle,
  • one APU fire switch,
  • one APU BOTTLE DISCHARGE light,
  • one EXT TEST switch

page 8.20.4

75
Q

where is the APU ground control panel located ?

A

right main wheel well

page 8.20.4

76
Q

what does the APU ground control panel contain ?

A
  • one APU fire warning light,
  • one APU BOTTLE DISCHARGE switch,
  • one APU fire control handle
  • one APU HORN CUTOUT switch

page 8.20.4

77
Q

illumination of the APU fire switch automatically unlocks the switch, can it be unlocked manually as well ?

A

YES

page 8.20.4

78
Q

pulling the APU fire switch UP …

A
  • provides backup for the automatic shutdown feature
  • deactivates the fuel solenoid and closes the APU fuel shutoff valve
  • closes the APU bleed air valve
  • closes the APU air inlet door
  • trips the APU generator control relay and breaker
  • allows the APU fire switch to be rotated for discharge
  • arms the APU fire extinguisher bottle squib

page 8.20.4

79
Q

which way does the APU fire switch has to be rotate to electrically fire the squib to discharge the exstinguishing agent into the APU ?

A

either way

page 8.20.4

80
Q

what is the main wheel well fire protection powered by ?

A

No.2 AC Transfer Bus

page 8.20.5

81
Q

does the main wheel well have a fire exstinguisher system ?

A

NO

page 8.20.5

82
Q

how many fire loops doest the wheel well fire detection system have ?

A

only one

page 8.20.5

83
Q

briefly explain how the wheel well fire detection system works ?

A

As the temperature of the detector increases to a predetermined limit, the detector senses a fire condition

page 8.20.5

84
Q

until when does the wheel well fire warning light remains illuminated ?

A

until the temperature of the detector has decreased below the onset temperature

page 8.20.5

85
Q

what are the indication for a Main Wheel Well fire ?

A
  • the fire warning bell sounds
  • both master FIRE WARN lights illuminate
  • the WHEEL WELL fire warning light illuminates

page 8.20.5

86
Q

which system does the Cargo Fire Protection consist of ?

A
  • smoke detection
  • fire exstinguisher

page 8.20.5

87
Q

what poweres the smoke detection system of the cargo compartment ?

A

DC Bus 1, DC Bus 2

page 8.20.5

88
Q

what powers the fire exstinguishing system of the cargo compartment ?

A

Hot Battery Bus

page 8.20.5

89
Q

do both AFT and FWD cargo comparment have smoke detectors ?

A

YES

page 8.20.5

90
Q

are the smoke detectors in the cargo compartmente a single or dual loop system ?

A

dual loop

page 8.20.5

91
Q

normally two loops are needed to detect smoke, what do you need to do if one fails ?

A

manually convert to single loop detection

(through the DETECT SELECT switch)

page 8.20.5

92
Q

in the event of a power faliure of one of the detector loops what would happen ?

A

the system automatically converts to signle loop detection

page 8.20.5

93
Q

what is the different in respond to a loop detector failure to a loop power faliure ?

A

detector failure - manually reverts to single loop

power failure - automatically reverts to single loop

page 8.20.5

94
Q

what are the indications of a fire in the cargo compartment ?

A
  • the fire warning bell sounds
  • both master FIRE WARN lights illuminate
  • the FWD/AFT cargo fire warning light(s) illuminates

page 8.20.6

95
Q

how many fire exstingushing bottles does the cargo compartment have ?

A

one

page 8.20.6

96
Q

where is the single fire exstinguisher bottle installed ?

A

in the air conditioning mix bay on the forward wing spar

page 8.20.6

97
Q

how is the exstinguisher of the cargo compartment armed ?

A

by pushing the appropriate cargo fire ARMED switch

page 8.20.6

98
Q

pushing the fire ARMED switch arms the fire exstinguisher of the cargo compartment, after that, how is the bottle discharged ?

A

by pressing the DISCH switch

page 8.20.6

99
Q

when you press the DISCH switch does this results in the total or partial discharge of the fire exstinguisher bottle ?

A

total

page 8.20.6

100
Q

how long can it take for the DISCH light to illuminate once the bottle has been discharged ?

A

up to 30 sec

page 8.20.6

101
Q

briefly explain the schematic of the Cargo Fire Exstinguisher ?

A

look at the picture

page 8.20.6

102
Q

what does the lavatory fire protection consist of ?

A
  • smoke detection
  • fire exstinguishing

page 8.20.6

103
Q

how is the lavatory fire exstinguisher activated ?

A

heat activated

page 8.20.6

104
Q

once smoke is detected in the lavatory how is this indicated ?

A
  • an aural warning sounds
  • the red alarm indicator light on the lavatory smoke detector panel illuminates

page 8.20.6

105
Q

is there any indication of smoke in the lavatory in the flight deck ?

A

NO

page 8.20.7

106
Q

once smoke is no longer present in the lavatory how is the ALARM reset ?

A

by pressing the INTERRUPT switch

page 8.20.7

107
Q

where is the lavatory fire exstinguisher system located ?

A

beneath the sink aerea in each lavatory

page 8.20.7

108
Q

is the lavatory fire exstinguisher operation automatic ?

A

YES

page 8.20.7

109
Q

does the flight deck have any indication of discharge of the fire exstinguisher ?

A

NO

page 8.20.7

110
Q

what are the indications for the FAULT/INOP test ?

A
  • both MASTER CAUTION lights illuminate
  • the OVHT/DET system annunciator light illuminates
  • the FAULT light illuminates
  • the APU DET INOP light illuminates

page 8.20.7

111
Q

what are the indications for the OVHT?FIRE test ?

A
  • the fire warning bell sounds
  • both master FIRE WARN lights illuminate
  • both MASTER CAUTION lights illuminate
  • the OVHT/DET system annunciator light illuminates
  • both engine fire switches illuminate
  • the APU fire switch illuminates
  • both ENG OVERHEAT lights illuminate
  • the WHEEL WELL fire warning light illuminates if AC power is available
  • on the ground, the wheel well APU fire warning horn sounds and the wheel well APU fire warning light flashes

page 8.20.7

112
Q

what are the indications for a Cargo Fire Test ?

A
  • the fire warning bell sounds
  • both master FIRE WARN lights illuminate
  • the extinguisher test lights illuminate
  • the FWD and AFT cargo fire warning lights illuminate when all detectors in selected loops (s) respond to the fire test
  • the cargo fire bottle DISCH light illuminates

page 8.20.8

B737 (8 decks)

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