Fire Protection

Question 1

What happens when either illuminated Master FIRE WARN light is pushed?

Answer 1

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.

Question 2

Which other switch provides the same function as pushing either Master Fire Warn light for an engine fire warning?

Answer 2

Bell Cutout Switch.

Question 3

Which Bus powers the Engine Overheat and Fire Detection?

Answer 3

Battery Bus

Question 4

Which Bus powers the Engine Fire Extinguishing?

Answer 4

Hot Battery Bus

Question 5

What will cause an illuminated ENG OVERHEAT light and/or Engine Fire Switch to extinguish?

Answer 5

Temperature drop below the onset temperature.

Question 6

With the OVHT DET switch in the A or B position, what initiates an overheat or fire warning?

Answer 6

An overheat detected on that corresponding loop.

Question 7

With the OVHT DET switch selected to “A”, during an Overheat/Fire Test, what does a FAULT light (amber) indication mean?

Answer 7

Selected loop has failed.

Question 8

If one overheat/fire detector loop fails with the OVHT DET switch on NORMAL, how is a fire detected?

Answer 8

System operates as a single loop system.

Question 9

What does rotating an Engine Fire Switch do?

Answer 9

Electrically fires a squib discharging the bottle into that engine.

Question 10

What causes a Fire Switch to unlock?

Answer 10

Illumination of an Engine Fire Switch or ENG OVERHEAT light unlocks the Engine Fire Switch.

Question 11

Which Bus powers the APU Overheat and Fire Detection?

Answer 11

Battery Bus

Question 12

Which Bus powers the APU Fire Extinguishing?

Answer 12

Hot Battery Bus.

Question 13

What does pressing the HORN CUTOUT switch on the APU Fire Control Panel (main wheel well) do?

Answer 13

Silences the Fire Warning Bell, silences the APU Fire Warning Horn, and causes the APU Fire Warning Light to stop flashing, but remains illuminated.

Question 14

What power source is required for Main Wheel Well fire detection?

Answer 14

No. 2 AC Transfer Bus.

Question 15

What components are tested with the Overheat/Fire Protection Panel Test Switch to OVHT/FIRE?

Answer 15

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

Question 16

What components are tested with the Overheat/Fire Protection Panel Test Switch to FAULT/INOP?

Answer 16

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

Question 17

What does a FAULT light (amber) illuminating during an OVHT FIRE test indicate?

Answer 17

Indicates a bad loop on one of the engines.

Question 18

What does the ENGINES APU EXT/TEST switch test?

Answer 18

Tests the squibs on the engine & APU fire bottles.

Question 19

What does a DETECTOR FAULT light (amber) illuminated indicate when TEST is pushed and held on the Boeing Cargo Fire Panel?

Answer 19

Will illuminate if one or more detectors in the loop(s) has failed.

Question 20

When does the first bottle on the Boeing Lower Cargo Compartment Fire Suppression Dual Bottle system discharge? The second bottle?

Answer 20

Right away and lasts 60 minutes. The second after a timer and provides 195 minutes of halon saturation.