C-40 FIRE WARNING AND CONTROL PANELS

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.

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.

Extinguisher (EXT) TEST Switch

(spring–loaded to center)

1 or 2 – tests bottle discharge circuit continuity for all three extinguisher bottles.

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 lights

-both MASTER CAUTION lights illuminate

-the OVHT/DET system annunciator light illuminates

-the FAULT light illuminates

-the APU DET INOP light illuminates.

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.

Engine (ENG) OVERHEAT Light

Illuminated (amber) – indicates overheat in related engine.

Note: MASTER CAUTION and OVHT/DET system annunciator lights illuminate.

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.

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.

Engine BOTTLE DISCHARGE Light

Illuminated (amber) – indicates related fire extinguisher bottle has discharged.

APU Detector Inoperative (DET INOP) Light

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

Note: MASTER CAUTION and OVHT/DET system annunciator lights illuminate

APU BOTTLE DISCHARGE Light

Illuminated (amber) – indicates APU extinguisher bottle has discharged

Extinguisher Test (EXT TEST) Lights

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

Extinguisher (EXT) Test Lights

Illuminated (green) - Cargo Fire TEST switch is pushed and fire bottle discharge squib circuit continuity is normal.

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.

DETECTOR FAULT Light

Illuminated (amber) -

-One or more of the selected detector loop(s) in either cargo compartment has failed.

PUSH - tests circuits for both forward and aft cargo fire detector loops and suppression system.

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.




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.

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.

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.

Cargo Fire Bottle Discharge (DISCH) Light

Illuminated (amber) - indicates that the first two extinguisher bottles have discharged.

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.

Each engine contains two overheat/fire detector loops. Each loop provides both fire and overheat detection.

Battery bus

Hot battery bus

AC transfer bus 2 and battery bus

DC bus 1 and DC bus 2

Hot battery bus

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.

-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.

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.

One.

Wheel well

-the fire warning bell sounds

-both master FIRE WARN lights illuminate

-the related engine fire switch illuminates

-all related engine overheat alert indications illuminate.

-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.

-the fire warning bell sounds

-both master FIRE WARN lights illuminate

-the WHEEL WELL fire warning light illuminates.

APU compartment

-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

-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

Both loops in one or both cargo compartments has failed