B-737 Ng - Fire Systems

Front 1

What does Pulling the Engine Fire Switch do? (6)

Back 1

Arms the squibs

Closes the two fuel SOVs

Closes hydraulic SOV on associated engine and deactivates engine LOW PRESSURE light

Closes bleed air SOV

Closes RT SOV

Trips associated generator

Front 2

What does pulling the APU Fire Switch do? (5)

Back 2

Arms the squib

Closes fuel SOV

Closes Bleed Air SOV

Trips APU generator

Closes the APU air inlet door

Front 3

How many fire extinguisher bottles do the engines have?

Back 3

2 bottles

Front 4

What detection does the engine have?

Back 4

Fire and Overheat detection using two loops

Front 5

What detection does the APU have?

Back 5

Fire detection ONLY

Front 6

How many fire bottles does the APU have?

Back 6

1

Front 7

How many loops are required to detect an Engine Fire/Overheat?

Back 7

2 if both loops are operating. If system is functioning in single loop mode a single loop will trigger the Engine Fire/Overheat

Front 8

If both loops are detected to not be working what light on the engine fire panel will illuminate?

Back 8

FAULT

Front 9

What does the APU DET INOP light mean?

Back 9

APU Fire detection is not working in the single loop

Front 10

How do you know a bottle has been discharged?

Back 10

The associated bottle discharge light will illuminate

Front 11

How is fire detected in the cargo compartments?

Back 11

Smoke detectors on both main and lower decks using the same dual loop sensing method as the engines

Front 12

How many fire bottles in the cargo compartment fire system?

Back 12

Depending on the airplane, 2 or 1

Front 13

After pressing the DISCHARGE switch what happens assuming cargo compartment bottles were armed?

Back 13

First bottle will rapid discharge, it can take upto 30 seconds as it is pressurising. The second bottle will automatically discharge over a 60 minute period into the selected compartment.

If airplane lands, discharge will stop

Front 14

How is fire extinguished on the main deck?

Back 14

Suppression (Depressurization)

Front 15

How is the cargo Fire system powered?

Back 15

DC Battery bus, so as soon as the battery switch is on. However the bottles are are powered by hot battery bus

Front 16

What cargo compartments use fire bottles to extinguish a fire?

Back 16

Lower FWD and AFT

Front 17

What parts of the aircraft have extinguishing systems?

Back 17

Engines

APU

Lavatory

Lower Cargo Compartments

Front 18

What fire protection system does the main gear wheel well have?

Back 18

Fire Detection ONLY

Front 19

Does the lavatory have fire detection and extinguishing?

Back 19

Yes, lavatory smoke detector and a heat activated fire extinguisher

Front 20

If there is smoke detected in the lavatory and the bottle is discharged is there an indication in the flight deck?

Back 20

No indication to flight deck on smoke detected or bottle discharged

Front 21

How many loops does the APU have for Fire Detection?

Back 21

1 ONLY

Front 22

What happens when you select the MAIN ARMED Cargo Fire switch?

Back 22

Energizes power to the Main Deck shutoff valves and mix manifold exhaust shutoff valve

Front 23

Where is the APU ground control panel located?

Back 23

Right gear wheel well

Front 24

When does the ENGINE OVERHEAT light extinguish following an overheat condition?

Back 24

It drops when the tempreture drops below the onset tempreture

Front 25

Is there a flight deck indication of an engine single loop failure?

Back 25

No, perform the SP to check for the individual loop

Front 26

If an engine fire condition exists does the associated ENGINE OVERHEAT light also illuminate?

Back 26

Yes

Front 27

Does the airplane need to have power applied to blow an engine or APU bottle?

Back 27

No, both extinguishing systems (squibs) are powered from the HOT BATTERY BUS

Front 28

Before doing the FIRE test why must the ground crew be made aware?

Back 28

With the APU running, the APU Fire warning horn sounds and warning light on the ground flashes

Front 29

What occurs when smoke is detected in the lavatory?

Back 29

Aural warning sounds and red alarm indicator light in the lav illuminates

Front 30

During a cargo Fire test when does the DETECTOR FAULT light illuminate?

Back 30

One or more detectors in the loops has failed

Front 31

If you complete the Fire test on DC power will the WHEEL WELL light illuminate during the test?

Back 31

No, you need AC power to test the loop in the wheel well

Front 32

Where are the engine fire bottles located?

Back 32

Left main wheel well