REVIEW QUESTIONS – FIRE PROTECTION

Question 1

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

Answer 1

-Extinguishes both FIRE WARN lights, Silences Fire Warning Bell, resets the system, and silences the Remote APU Warning Horn (on the ground)

Question 2

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

Answer 2

-Fire Warning BELL CUTOUT switch

Question 3

3. Which Bus powers the Engine Overheat and Fire Detection? Which Bus powers the Engine Fire Extinguishing?

Answer 3

Battery Bus -Hot Battery Bus

Question 4

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

Answer 4

-The temperature to drop below the preset value.

Question 5

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

Answer 5

-The system acts like a single loop.

Question 6

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

Answer 6

-The A loop has failed.

Question 7

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

Answer 7

-The system has a fault monitoring circuit, and deselects the inop loop, acting like a single loop system.

Question 8

8. What does rotating an Engine Fire Switch do?

Answer 8

-Shoots a squib into the related engine.

Question 9

9. What causes a Fire Switch to unlock?

Answer 9

-Illumination of an Engine Fire Switch or ENG OVERHEAT light

Question 10

10. Which Bus powers the APU Overheat and Fire Detection? Which Bus powers the APU Fire Extinguishing?

Answer 10

-Battery Bus -Hot Battery Bus

Question 11

11.What does pressing the HORN CUTOUT switch on the APU Fire ControlPanel (main wheel well) do?

Answer 11

-Silences the Fire Warning Bell, silences the APU Fire Warning Horn, and causes the APU Fire Warning Light to stop flashing, but it remains illumated

Question 12

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

Answer 12

-AC power (#2 AC Transfer Bus)

Question 13

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

Answer 13

-Overheat and Fire loops on both engines, the APU, and fire detector in the wheel well.

Question 14

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

Answer 14

-Fault detection circuits for both engines and the APU

Question 15

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

Answer 15

-A bad loop

Question 16

16. What does the ENGINES APU EXT/TEST switch test?

Answer 16

-Tests the engine’s squibs (left and right) for the engine tested, and the APU squib

Question 17

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

Answer 17

-one or more detector loops has failed

Question 18

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

Answer 18

-When you push the DISCH switch
-Automatically 60 minutes later, at a metered rate for a total of 135 minutes