FIRE PANEL Flashcards
OVHT DET Switch
NORMAL:
- detection loop A and B are active (makes both loops agree before overheat or fire alarm condition operates.
A: detection loop A active
B: detection loop B active
FIRE WARNING BELL CUTOUT Switch
- Push:
- Extinguishes BOTH MASTER FIRE WARN lights
- silences fire warning bell
- silences remote APU fire warning horn and the flashing APU light to go steady (on ground only)
- resets systems for addn warnings
EXTINGUISHER TEST Switch
- Spring-loaded to center
1 OR 2: Squib Test
- tests bottle discharge circuit continuity for all 3 extinguisher bottles
- 1 - Test FORWARD squib on the L & R bottle (#1 engine) AND the single APU squib
- 2 - tests REAR squib on the L & R bottle (#2 engine) AND the single APU squib
SQUIB TEST LIGHTS:
- Illuminated (green) - discharge circuits are normal
- green lights have a push to test feature
FAULT / INOP and OVHT/FIRE TEST Switch
- switch allows you to run 2 tests
- 1 test if for fault detection
- the other is for fire detector loops
- verify all 3 fire handles are DOWN and OVH DET in NORMAL
- spring loaded to center
FAULT / INOP TEST:
- tests fault detection circuits for both engines and apu
- look for 5 amber lights
- look for [FAULT] light to illuminate - if it doesnt the monitoring system is INOP
- do not operate the apu if the [APU DET INOP] light FAILS to ILLUMINATE
OVHT / FIRE TEST Switch:
- test overheat and fire detection loops on both engines, APU and the fire detector in the wheel well
- looking for either 10 or 11 lights (the wheel well light is AC powered so that is the 11th light as long as AC power is on the aircraft)
- Get 10 or 11 lights, alarm bell, APU horn (in wheel well), APU fire warning light flashing in the wheel well
- this test does NOT shut down the APU if its running
ENG FIRE Switch
What happens when you pull the fire handle? (1sp)
[1sp: SAFEHIDE
S - Silences Bell
A - Arms squibs
F - fuel/spar shutoff valve closes
E (electrics) - Generator trips off
H - Hyd shutoff valve closes (eng driven pump)
I - Inhibit HYD low pressure light (eng driven pump)
D - Disables thrust reversers
E - Eng bleed valve closes]
Illuminated (Red):
- indicates fire in related engine
- unlocks related engine fire switch (normally locked)
- Master Fire Warning lights illuminate and fire bell sounds
IN: normal position, mechanically locked if no fire signal
Indications of an Engine Fire:
- Both FIRE WARN lights
- fire bell
- related ENG FIRE Switch
- related ENG OVERHEAT light illuminates
Pulling Fire Switch:
- allow rotation for bottle
- arms one squib on each bottle
- GEN trips OFF
- Closes:
- SPAR FUEL SOV
- HYD EDP SOV and deactivates LOW PRESSURE light
- Bleed Air Valve (temp loss of wing ai to affected wing) and pack valve closes due to no air
- Thrust Reverser Deactivated
Rotating Fire Switch:
- fires a squib (discharging the agent (halon) into related engine)
- illuminates [BOTTLE DISCHARGE] light
- Eng 1: Clockwise turn - fires front squib on the R Bottle
- Eng 1: CCW turn - fires front squib on the L Bottle
- Eng 2: CW turn - fires REAR squib on R bottle
- Eng 2: CCW turn - fires REAR squib on L bottle
APU FIRE Switch
Illuminated (Red):
- indicates Fire in APU
- unlocks the APU fire switch
Indications of APU Fire:
- Master FIRE WARN lights
- Fire Bell
- APU fire horn (in main wheel well on the ground)
- APU fire warning light flashes (wheel well)
IN: normal position, mechanically locked if no fire signal
UP:
- arms APU squibs
- Closes:
- Fuel shutoff valve
- APU bleed air valve
- APU inlet door
- Trips Generator
- allows APU fire switch to rotate
-
Memory aid: 2 SOVs and BAD
- Fuel & APU Bleed air SOV
- B - Breaker A - Arms squib D - inlet Door
Rotate Left or Right: discharges APU fire bottle
ENG OVERHEAT Lights
Illuminated (amber):
- indicates overheat in related engine
- MC and OVHT/DET lights illuminate
WHEEL WELL FIRE WARNING Light
Scenario.
we but the battery on we try to do the fire test, when we do the fire test will we see a wheel well light? (1sp)
[1sp: no because its powered by ac transfer bu]
Illuminated (Red):
- indicates a fire in the MAIN gear wheel well
- Master Fire Warn and bell
- single loop system in the WW
- requires normal AC power (AC Transfer Bus)
FAULT Light
Illuminated (Amber):
- if OVHT detectors are in NORMAL - both detector loops have failed
- if in A or B - selected loop has failed
- if in Normal and single loop fails there is NO indication
* MC and OVHT/DET LIGHTS DO NOT ILLUMINATE (only amber that doesnt set it off)
-
2 SYSTEMS:
-
FAULT MONITORING
- see above - loops
- FAULT DETECTION
- checks the circuits - via the test
-
FAULT MONITORING
APU DET INOP Light
Illuminated (Amber):
- APU detector Loop has FAILED (will trigger MC and OVHT/DET lights)
- if you allowed the APU to run in this condition, an APU fire would not be detectable and the APU would continue to run.
APU BOTTLE DISCHARGED Light
Illuminated (Amber):
- indicates APU bottle has discharged and the bottle is empty
L / R BOTTLE DISCHARGED Light
Illuminated (Amber):
- related fire bottle has discharged or bottle pressure is low
