B737 Fire Detection And Protection

Front 1

Which Lights illuminate during the Fault/Inop Test

Back 1

Five lights: 2 MC, OVHT/DET, FAULT, APU DET INOP

Hint 1

Front 2

Which lights illuminate during the OVHT/FIRE test? How many lights?

Back 2

11 COCKPIT Lights: 2 FIRE WARN, 2 MC, OVHT/DET, ENG 1 OVERHEAT, ENGINE 2 OVERHEAT, WHEEL WELL, FIRE HANDLE 1, APU FIRE HANDLE, FIRE HANDLE 2,
FIRE BELL
1 EXTERIOR APU RED FLASHING LIGHT AND WARNING HORN

Hint 2

Front 3

What happens if you perform the FIRE/OVHT test with DC power only? (not on AC power)

Back 3

you will only see 5 lights illuminate on the fire protection panel and the test will need to be performed again when on AC power

Front 4

Whatbis indicated if the FAULT light illuminates during the FIRE/OVHT test?

Back 4

Indicates a fault of at least one detector loop is indicated. The FAULT light should not illuminate during this test.

Front 5

Extinguisher Test: What is tested and what should illuminate?

Back 5

The 1 and 2 position tests the circuitry for one discharge circuit on each fire extinguisher and the circuitry for the APU fire extinguisher.

Hint 5

Front 6

Cargo compartment fire test?
What will illuminate? How many lights?

Back 6

Seven lights total. 2 Master Fire Warn lights. On Panel Five lights, 2 EXT TEST LIGHTS, FWD AND AFT, and DISCH.
.tests the continuity of the fire bottle squib circuitry

Hint 6

Front 7

How does the cargo fire detection work?

Back 7

dual detector loops, same logic as engine fire detector loops, powered by DC BUS 1 AND DC BUS 2

Front 8

Cargo fire extinguishing system
how many bottles, how do they discharge,
what is the power source for extinguishing.

Back 8

two fire extinguishing bottles, one high rate and one low rate. crew must select which compartment to discharge to, first bottle knocks down the fire, second discharges automatically after 60 minutes and maintains extinguishing level.
Powered by HOT BATTERY BUS

Front 9

Cargo DETECTOR FAULT light, when will it illuminate?

Back 9

Illuminates if one or more detectors in the selected loops have failed.

Front 10

APU Ground Control Panel

Back 10

APU FIRE CONTROL HANDLE
-Arms bottle discharge switch
-closes APU fuel and bleed air valves, APU inlet door
-trips generator control relay

APU BOTTLE DISCHARGE SWITCH
if APU FIRE CONTROL HANDLE is pulled, switch discharges APU extinguisher

APU Fire Warning Horn Cutout
silences fire bell, APU WARNING horn, stops APU fire warning light from flashing but remains illuminated

APU Fire warning light
red flashing indicates fire in APU

Front 11

Some simple faults will not illuminate the MC light and a system annunciator until RECALL. How can you reset the annunciator and system light?

Back 11

press MC light

Front 12

What is the power source for fire detection?

Back 12

battery bus

Front 13

What is the power source for fire protection?

Back 13

hot battery bus

Front 14

What is the power source for wheel well fire detection?

Back 14

#1AC transfer bus

Front 15

What happens when you pull an engine fire handle?

Back 15

-arms one discharge squib on each engine fire extinguisher
-closes the fuel (spar and engine), hydraulic, and engine bleed air valves
-disables the thrust reverser
-trips generator control relay and breaker.
-deactivates ENG HYD low pressure light
-allows rotation of the fire switch

Front 16

Where are the engine fire bottles located?

Back 16

Left wheel well

Front 17

What are the indications of an APU fire?

Back 17

-fire warning bell sounds
-both fire warning lights illuminate
-APU fire warning switch illuminates
-APU shuts down automatically
-Wheel well fire warning horn sounds, and wheel light flashes

Front 18

Where is the APU fire bottle located?

Back 18

in the APU compartment

Front 19

What happens when you pull the APU fire switch?

Back 19

-arms the APU extinguisher circuit
-closes the fuel shutoff valve, APU bleed air valve, and APU inlet door
-Trips the Gen control relay and breaker
-allows the APU fire switch to rotate

Front 20

In flight, if a detector fault light illuminates, what has happened?

Back 20

both loops in one or both cargo compartments have failed

Front 21

What if a detector fault light illuminates during a test.

Back 21

one or more detectors in the loop(s) has failed