B737 Cl Fire Protection Qrh 8

Front 1

The Engine Overheat and Fire Protection system has

Back 1

Two overheat/fire detection loops, each consisting of four detector elements, installed in each engine nacelle.

Front 2

An overheat or fire alert will be given with the OVHT DET switch in NORMAL and both loops serviceable when

Back 2

One of the detector elements of loop A and one of the detector elements of loop B sense a fire or overheat.

Front 3

The FAULT light illuminates

Back 3

If the OVHT DET switch is to 'A' or 'B' and the selected loop senses a fault.
If both loops sense a fault with the OVHT DET switch in the NORMAL position.

Front 4

With the OVHT DET switch in the B position

Back 4

Only the B detector loop can initiate an overheat or fire warning.

Front 5

Holding the TEST switch to the FAULT/ INOP position

Back 5

Tests the fault detection circuits for both engines and the APU.

Front 6

Holding the TEST switch to the FAULT/ INOP position

Back 6

Will illuminate the Master Caution, OVHT/DET annunciator, FAULT and APU DET INOP lights.

Front 7

Holding the TEST switch to the OVHT/FIRE position with AC on the busses will illuminate the

Back 7

Master FIRE WARNING lights. Master Caution lights and OVHT/DET annunciator. ENG 1, ENG 2 and APU Fire Warning lights. ENG 1 and ENG 2 OVERHEAT lights. WHEEL WELL light.

Front 8

The Engine Fire Extinguisher system contains

Back 8

Two freon bottles in the main wheel well with their associated plumbing to both engines.

Front 9

The Engine Fire Extinguisher system contains

Back 9

Two freon bottles which may be discharged into either engine.

Front 10

What should be the first action in the event of a Fire Warning

Back 10

Cancel the Fire bell.

Front 11

An engine fire condition is indicated by the

Back 11

Illumination of the master FIRE WARNING lights, associated engine fire switch light and the sound of the alarm bell.

Front 12

In the event of an engine fire warning, the bell may be silenced and the master FIRE WARNING lights extinguished by

Back 12

Pressing either master FIRE WARNING light or the bell cutout switch on the fire panel.

Front 13

During the Engine Fire drill, the pneumatic ISOLATION VALVE switch should be selected to

Back 13

CLOSE.

Front 14

Pulling an Engine Fire switch will

Back 14

Trip the generator control relay and breaker.
Close the fuel, hydraulic fluid shutoff and engine bleed air valves.
Arm one discharge squib on each engine fire extinguisher.
Silence the fire bell
Allow the engine fire warning switch to be rotated for discharge.
Disable the thrust reverser.
Deactivate the engine driven hydraulic pump LOW PRESSURE light

Front 15

The power source for the Engine Overheat and Fire Detection is?

Back 15

Battery Bus (28V DC).

Front 16

Indication that an Engine Fire Bottle has been discharged is

Back 16

An amber BOTTLE DISCHARGE light (on the fire panel) illuminating a few seconds after fire warning switch rotation.

Front 17

The APU Horn Cutout switch in the main wheel well

Back 17

Will silence the fire alarm bell and the APU fire warning horn, and cause the APU fire warning light (main wheel well) to stop flashing but remain illuminated.

Front 18

Pulling the APU Fire Control Handle in the main wheel well will

Back 18

Close the APU fuel shutoff, bleed air valve and APU inlet door.
Arm the APU bottle discharge switch on the APU ground control panel
Trip the generator control relay and generator breaker.

Front 19

The APU Ground Control Panel is located

Back 19

In the main wheel well.

Front 20

If following an overheat condition, the OVERHEAT light extinguishes after thrust lever closure

Back 20

Operate that engine at reduced thrust to keep the light extinguished.

Front 21

The APU horn in the main wheel well can be silenced by

Back 21

Either the Horn Cutout switch in the wheel well or the Bell Cutout switch on the fire panel (Aft Electronics Panel) in the flight deck.

Front 22

All switches on the Fire Panel are in their normal positions. The TEST switch is then held in the OVHT/FIRE position and all normal test indications are observed. The FAULT light is also observed to be illuminated which would mean that

Back 22

There is a short circuit on one of the loops.

Front 23

During an OVHT/FIRE test the No 1. Fire Handle light and associated overheat light do not illuminate indicating

Back 23

There is an open circuit on one of the loops for No. 1 engine.

Front 24

The power source for the APU Fire Detection is the

Back 24

Battery Bus (28V DC).

Front 25

The power source for the Wheel Well Fire Detection is the

Back 25

The No. 1 Transfer Bus (115V AC).

Front 26

The power source for the Lavatory Smoke Detector is the

Back 26

DC Bus No. 1 (28V DC).

Front 27

The power source for the APU Fire Extinguishing system is the

Back 27

Hot Battery Bus (28V DC).

Front 28

The power source for the Engine Fire Extinguishing system is the

Back 28

Hot Battery Bus (28V DC).

Front 29

When the Extinguisher Test switch is held in the 1 or 2 position, 3 lights illuminate indicating

Back 29

The associated bottle discharge circuits for all 3 extinguisher bottles are being tested.

Front 30

You test the green squib Ext test lights. If the lights come on, it indicates that the squibs are intact.

Back 30

True.

Front 31

A missing yellow APU disk indicates that the APU fire bottle has been discharged into the engine.

Back 31

True.

Front 32

What is the problem if the FAULT light does not come on with the test switch to the Fault/Inop position?

Back 32

There is no fault monitoring circuit.

Front 33

How many lights should come on during the fire test with the test switch to Ovht/Fire?

Back 33

7

Front 34

The Fault/Inop test was successful. The FAULT light illuminates when you press the Test Switch to Ovht/Fire. What is the problem?

Back 34

You have a bad loop in one of the two engines.

Front 35

Which of the following should be done if a FAULT light illuminates when the Test switch is at Ovht/Fire?

Back 35

Take the Ovht Det switches, one at a time, to A then B. When you hit the bad loop, the FAULT light will illuminate, hence showing which loop is bad.
Take the overheat detector switch on the bad loop engine to the good loop - put the other engine overheat detector switch to NORMAL. This deselects the bad loop.
Redo the Ovht/Fire test. The fire test should now be normal. Get a dispatch release to operate the flight.

Front 36

The APU loop monitors the APU for fires only.

Back 36

False.

Front 37

Will the FAULT light cause the MC annunciator light to illuminate?

Back 37

No.

Front 38

The engines have ________ fire detection loop(s); the APU has _______; the wheel well has _______.

Back 38

2, 1, 1.

Front 39

What is the normal engine fire bottle pressure?

Back 39

760 +/- 4 PSI @ 70F

Front 40

What is the normal APU fire bottle pressure?

Back 40

540 +/- 4 PSI @ 70 F.

Front 41

What happens when you pull the engine fire switch?

Back 41

Closes the engine bleed air, hydraulic and fuel valves.
Disarms the thrust reverser and engine hydraulic pump low pressure light.
Arms the fire extinguisher and opens the associated generator field relay.

Front 42

What is the power source for the engine detection and protection fire circuits ?

Back 42

Battery bus for the detection circuit, hot battery bus for fire protection.

Front 43

The APU has two disks - A red one and a yellow one. If the red one is missing, it indicates that the APU fire bottle has thermally discharged.

Back 43

True.

Front 44

The wheel well loop monitors the wheel well continuously.

Back 44

False.

Front 45

The wheel well loop monitors the wheel well for fire and fault.

Back 45

False

Front 46

Pulling the Fire Handle will open the associated generator field relay.

Back 46

True.

Front 47

The APU has _____ fire bottles.

Back 47

1

Front 48

What do the engine loops monitor and when are they monitored?

Back 48

Overheat, Fire or faults - continuously.

Front 49

In the engine, if one loop malfunctions, you can still get a fire warning. The malfunctioning loop is deselected and the other one takes over.

Back 49

True.

Front 50

What would cause a FAULT light to illuminate in flight?

Back 50

Both loops have failed.

Front 51

What is the power source for the wheel well detection circuit?

Back 51

AC.

Front 52

What is the power source for the detection and protection circuits of the APU?

Back 52

Battery Bus; Hot battery bus.

Front 53

How many lights you should see during a fire test (test switch to the fault/inop position)?

Back 53

5

Front 54

You place the test switch to the fault/inop position. The fault/inop light does not illuminate. Is this normal?

Back 54

The fault monitoring circuit is not functioning.

Front 55

What is the significance of an illuminated FAULT light when the test switch is placed to the OVHT/FIRE position?

Back 55

There is a bad loop in one of the engines.

Front 56

The FAULT light illuminates in flight. What does this indicate?

Back 56

Both loops have failed.

Front 57

During preflight, you notice that the R bottle discharge light is illuminated.How can you tell if the bottle was fired or thermally discharge?

Back 57

Test the squib lights. If one green squib light does not illuminate, then the bottle was dscharge

Front 58

What happens when you pull the fire handle?

Back 58

1-Closes the engine bleed air
2-Closes the hydraulic valve
3-Closes the fuel valve at the tank
4-Disarms the thrust reverser
5-Disarms the Engine Hyd Low Pressure
6-Arms the fire extinguiser
7-Opens the genrator field relay

Front 59

How many fire botles are available for the APU?

Back 59

ONE

Front 60

How many fire detection loops has the APU?

Back 60

ONE

Front 61

What does the wheel well loop monitor?

Back 61

Fire, only when test conducted

Front 62

Does the APU loop monitors for overheats?

Back 62

NO

Front 63

During the preflight, the first officer notices that the yellow APU disk is missing, What does this indicate?

Back 63

The APU fire bottle was discharged into the APU.

Front 64

During the preflight, the first officer notices that the red APU disk is missing, What does this indicate?

Back 64

The APU fire bottle was thermally discharged.

Front 65

What is the difference between the engine and APU fire protection systems?

Back 65

The APU fire protection system does not have an overheat detection capability.

Front 66

What is the source of power for the fire detection loops?

Back 66

The BATT BUS

Front 67

Loop A is selected. Which of the following is true?

Back 67

Only loop A needs to sense a fire or overheat to trigger a warning.

Front 68

What does not happen when you pull an engine fire switch?

Back 68

Automatically discharges the fire bottle.

Front 69

What is required in order to fire the bottle?

Back 69

28 Volts DC

Front 70

Which of the following is false concerning the APU fire protection system?

Back 70

The APU does not automatically shutdown in the event of a fire.

Front 71

What happens when you pull the APU fire switch?

Back 71

The APU fuel shutoff valve closes.

Front 72

What is the purpose of the APU fire bottle discharge discs on the exterior of the aircraft?

Back 72

A missing yellow disk indicates that the APU has been intentionally discharged.

Front 73

Which is not an indication there is smoke or fire in the lavatory?

Back 73

The fire warning aural warning sounds in the cockpit.

Front 74

Which of the following is true concerning the fire detection fault protection system?

Back 74

If either loop A orB fails, the fault detection system will automatically deactive the defective loop.

Front 75

What is the difference between the engine and APU fire protection systems?

Back 75

The APU fire protection system does not have an overheat detection capability.