Fire Protection Flashcards

1
Q

What powers engine and APU overheat and fire DETECTION?

A

Engine Overheat and Engine and APU Fire Detection powered by the Battery Bus

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2
Q

What powers engine and APU overheat and fire extinguishing?

A

Engine and APU Fire Extinguishing powered by the Hot Battery Bus

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3
Q

How are Fire Detection Loop failures indicated?

A

The FAULT (amber) light illuminates with the OVHT DET switch positioned to:
- NORMAL, if both loops fail on an engine
- A or B, and the selected loop has failed
- A or B (operative loop), with the other loop inoperative and the selected loop fails

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4
Q

How is an engine or APU fire bottle discharged?

A

Rotating the Engine Fire Switch electrically “fires” a squib, discharging the extinguishing agent into the related engine. Rotating the switch the other way discharges the remaining bottle.

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5
Q

Which system(s) are affected by pulling an Engine Fire Switch?

A

Pulling the Engine Fire Switch up:
- closes:
• both the Engine Fuel Shutoff Valve and the Spar Fuel Shutoff Valve
• the Engine Bleed Air Valve resulting in loss of wing anti-ice to the affected wing and closure of bleed air operated Pack Valve
• the Hydraulic Fluid Shutoff Valve. The engine-driven Hydraulic Pump LOW
PRESSURE light is deactivated
- trips the Generator Control Relay and Breaker
- disables thrust reverser for the related engine
- arms one discharge squib on each Engine Fire Extinguisher Bottle
- allows the Engine Fire Switch to be rotated for discharge

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6
Q

What are the components of the APU Fire Detection and Extinguishing system?

A

APU fire protection consists of these systems:
• APU Fire Detection powered by the Battery Bus
• APU Fire Extinguishing powered by the Hot Battery Bus

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7
Q

What are the effects of pulling an APU Fire Switch up?

A

Pulling the APU Fire Switch up:
- 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

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8
Q

Will the APU fire bottle discharge automatically for an APU fire?

A

No

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9
Q

Where is the APU Fire Ground Control Panel?

A

The APU Ground Control Panel located in the right main wheel well also contains an:
- APU Fire Warning Light
- APU HORN CUTOUT switch

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10
Q

Does the Main Wheel Well have a fire extinguishing system?

A

No, The main wheel well has no fire extinguishing system. The nose wheel well does not have a fire detection system.

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11
Q

How can the Fire Warning Bell be silenced?

A

Pushing either of the
two Master FIRE WARN lights:
• extinguishes both FIRE WARN lights, and
• silences the Fire Warning Bell, and
• resets the system for future warnings, and
• (on the ground) silences the Remote APU Fire Warning Horn

The Fire Warning BELL CUTOUT switch (located on the top center portion of the
Overheat/Fire Protection Panel), when pushed, provides the same function as pushing either Master FIRE WARN light.

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12
Q

What does placing the TEST switch on the Fire Protection Panel to FAULT/INOP and FIRE/OVHT test?

A

The indications for the FAULT/INOP test are:
- both MASTER CAUTION lights illuminate
- the OVHT/DET system annunciator light illuminates
- the FAULT light illuminates (the failure of the FAULT light to illuminate indicates the
Fault Monitoring System is inoperative)
- the APU DET INOP light illuminates

The indications for the OVHT/FIRE test are:
- the Fire Warning Bell sounds
- both Master FIRE WARN lights illuminate
- both MASTER CAUTION lights illuminate
- the OVHT/DET annunciator light illuminates
- both ENG OVERHEAT lights illuminate
- both Engine Fire Switches illuminate
- the APU Fire Switch illuminates
- 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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13
Q

How is a Lower Cargo Compartment fire detected?

A

The Forward and Aft Lower 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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14
Q

What does an illuminated DETECTOR FAULT (amber) light indicate on the Cargo Fire panel?

A

The DETECTOR FAULT (amber) light, when illuminated with the DET SELECT
switches in normal, indicates one or more detectors in the loops have failed.

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