C-40 FIRE WARNING AND CONTROL PANELS

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    What does #1 do?
    Overheat Detector (OVHT DET) Switch

    NORMAL – detection loop A and loop B are active.

    A – detection loop A is active.

    B – detection loop B is active.
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    What does #2 do?
    Fire Warning BELL CUTOUT Switch

    Push –

    -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.
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    What does #3 do?
    Extinguisher (EXT) TEST Switch

    (spring–loaded to center)

    1 or 2 – tests bottle discharge circuit continuity for all three extinguisher bottles.
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    What does #4 do?
    Fault/Inoperative (FAULT/INOP)/ Overheat/Fire (OVHT/FIRE) TEST Switch

    (spring–loaded to center)

    FAULT/INOP – tests fault detection circuits for both engines and the APU.

    OVHT/FIRE – tests overheat and fire detection loops on both engines and APU, and wheel well fire detector
  5. What are the indications of a successful FAULT/INOP test?
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    5 lights

    -both MASTER CAUTION lights illuminate

    -the OVHT/DET system annunciator light illuminates

    -the FAULT light illuminates

    -the APU DET INOP light illuminates.
  6. What are the indications of a successful OVHT/FIRE test?
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    11 lights (10 without AC power) and a bell

    -the fire warning bell sounds

    -(2) both master FIRE WARN lights illuminate

    -(2) both MASTER CAUTION lights illuminate

    -(1) the OVHT/DET system annunciator light illuminates

    -(2) both engine fire switches illuminate

    -(1) the APU fire switch illuminates

    -(2) both ENG OVERHEAT lights illuminate

    -(1) 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.
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    What does #1 mean?
    Engine (ENG) OVERHEAT Light

    Illuminated (amber) – indicates overheat in related engine.

    Note: MASTER CAUTION and OVHT/DET system annunciator lights illuminate.
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    What does #2 mean?
    FAULT Light

    Illuminated (amber) – with the overheat detector switch in NORMAL - indicates both detector loops for an engine have failed.

    Illuminated (amber) – with the overheat detector switch in A or B – indicates the selected loop for an engine has failed.

    Note: MASTER CAUTION and OVHT/DET system annunciator lights do not illuminate.
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    What does #3 mean?
    WHEEL WELL Fire Warning Light

    Illuminated (red) – indicates fire in main gear wheel well

    Note: Master FIRE WARN lights illuminate and fire warning bell sounds.
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    What does #4 mean?
    Engine BOTTLE DISCHARGE Light

    Illuminated (amber) – indicates related fire extinguisher bottle has discharged.
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    What does #5 mean?
    APU Detector Inoperative (DET INOP) Light

    Illuminated (amber) – indicates APU detector loop has failed.

    Note: MASTER CAUTION and OVHT/DET system annunciator lights illuminate
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    What does #6 mean?
    APU BOTTLE DISCHARGE Light

    Illuminated (amber) – indicates APU extinguisher bottle has discharged
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    What does #7 do?
    Extinguisher Test (EXT TEST) Lights

    Illuminated (green) – EXT TEST switch is positioned to 1 or 2 and circuit continuity is normal

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    What does #1 mean?
    Extinguisher (EXT) Test Lights

    Illuminated (green) - Cargo Fire TEST switch is pushed and fire bottle discharge squib circuit continuity is normal.
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    What does #2 do?
    Detector Select (DET SELECT) Switches

    NORM - detection loop A and B are active.

    A - detection loop A is active.

    B - detection loop B is active.
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    What does #3 mean?
    DETECTOR FAULT Light

    Illuminated (amber) -

    -One or more of the selected detector loop(s) in either cargo compartment has failed.
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    What does #4 do?
    PUSH - tests circuits for both forward and aft cargo fire detector loops and suppression system.
  18. What are the indications of a successful CARGO FIRE test?
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    7 lights and a bell

    -the fire warning bell sounds

    -(2) both master FIRE WARN lights illuminate

    -(2) the extinguisher test lights illuminate

    -(2) the FWD and AFT cargo fire warning lights illuminate when all detectors in selected loop(s) respond to the fire test

    -(1) the cargo fire bottle DISCH light illuminates

    Note: During a Cargo Fire Test, the DETECTOR Fault light will illuminate if one or more detectors in the loop(s) has failed.


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    Note: Individual detector faults can only be detected by a manually initiated test.

    The MASTER CAUTION light does not illuminate.

    Note: At the end of cargo fire testing, up to a four second delay may occur to allow all applicable indications to extinguish at the same time.
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    What does #5 mean/do?
    Cargo Fire ARM Switches

    PUSH -

    -FWD ARMED - extinguisher armed for the forward cargo compartment

    -AFT ARMED - extinguisher armed for the aft cargo compartment.

    Note: If the first two bottles have discharged and the system remains armed, the third bottle discharge is inhibited upon landing. The third bottle discharge timer is disabled when the system is disarmed.
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    What does #6 mean?
    Cargo Fire (FWD/AFT) Warning Lights

    Illuminated (red) -

    -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.

    Note: Master FIRE WARN lights illuminate and fire warning bell sounds.
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    What does #7 do/mean?
    Cargo Fire Bottle Discharge (DISCH) Light

    Illuminated (amber) - indicates that the first two extinguisher bottles have discharged.
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    What does #8 do/mean?
    Cargo Fire Discharge (DISCH) Switch

    PUSH - if system is armed, discharges the first two extinguisher bottles. The timer is set for 60 minutes to discharge the third extinguisher bottle.
  23. What overheat and/or fire detection is provided for the engines?
    Each engine contains two overheat/fire detector loops. Each loop provides both fire and overheat detection.
  24. What is the power source for engine/APU fire detection?
    Battery bus
  25. What is the power source for engine/APU fire protection?
    Hot battery bus
  26. What is the power source for wheel well fire detection?
    AC transfer bus 2 and battery bus
  27. What is the power source for cargo compartment smoke detection?
    DC bus 1 and DC bus 2
  28. What is the power source for cargo compartment fire suppression
    Hot battery bus
  29. How many smoke detector loops does the aft cargo compartment have?
    The forward and aft cargo compartments each have smoke detectors in a dual loop configuration. Normally, both detection loops must sense smoke to cause an alert.

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  30. What are the indications of a cargo compartment fire?
    -the fire warning bell sounds

    -both master FIRE WARN lights illuminate

    -the FWD/AFT cargo fire warning light(s) illuminates.

    After the initial indication of a cargo compartment fire, the FWD/AFT cargo fire warning light(s) can extinguish, remain illuminated, or re-illuminate over the remainder of the flight. If the FWD/AFT cargo fire warning light(s) re-illuminate, both master FIRE WARN lights also re-illuminate and the fire warning bell sounds.
  31. How many fire extinguisher bottles are installed for cargo fire suppression, where, and how do they work?
    Three fire extinguisher bottles are installed in the cargo compartment.  Once armed, the first two bottles are discharged by pushing the cargo fire DISCH switch. This results in the total discharge of the bottles contents into the selected compartment. The third bottle discharge is metered to discharge at a reduced flow into the selected compartment. Discharge of the third bottle may be disabled if the system is disarmed. The cargo fire DISCH light illuminates when a bottle is discharged indicating the fire suppression system has been fully activated. It may take up to 30 seconds for the light to illuminate. On landing, if the first two bottles were discharged and the system remains armed, the third bottle discharge is inhibited.

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  32. How many fire detection loops are installed in the main wheel well?
    One.
  33. Where are the engine fire bottles located?
    Wheel well
  34. What are the indications of an engine fire?
    -the fire warning bell sounds

    -both master FIRE WARN lights illuminate

    -the related engine fire switch illuminates

    -all related engine overheat alert indications illuminate.
  35. What are the indications of an APU fire?
    -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.
  36. What are the indications of a wheel well fire?
    -the fire warning bell sounds

    -both master FIRE WARN lights illuminate

    -the WHEEL WELL fire warning light illuminates.
  37. Where is the APU fire bottle located?
    APU compartment
  38. What happens when you pull a fire handle?
    -engine fuel valve closes/spar fuel valve closes

    -generator trips

    -hydraulic fluid shutoff valve closes/engine driven pump low pressure light is deactivated

    -bleed air valve closes

    -thrust reverser is disabled

    -allows rotation of fire switch

    -arms discharge squib
  39. What happens when you pull the APU fire handle?
    -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
  40. In flight, if a DETECTOR FAULT light illuminates, what has happened?
    Both loops in one or both cargo compartments has failed
Author
CForty
ID
350117
Card Set
C-40 FIRE WARNING AND CONTROL PANELS
Description
C-40 FIRE WARNING AND CONTROL PANELS
Updated