8 Fire Protection

Question 1

Bell cutout switch

Answer 1

cuts of: master fire warn, fire bell, remote APU fire warning horn (only on GND), resets system for more fire detections

Question 2

FAULT/INOP
OVHT/FIRE

Answer 2

ENG and APU
ENG, APU, Wheel well

Question 3

APU fire switch
- pull
- HORN

Answer 3

Pull
- arms APU extinguisher circuit, the squib
- closes fuel shutoff valve, APU bleed air valve, APU inlet door
- trips generator control relay + breaker
- provides back up for auto shutdown

Horn sounds on GND only, only for APU fire

Question 4

ENG fire switch
- puil

Answer 4

Pull
- arms discharge on each fire extinguisher
- disable thrust reverser
- closes fuel (SU+spar), hydraulic shutoff, ENG bleed air valves closes
- trips generator control relay + breaker
- deactivates ENG driven hydraulic pump “LOW PRESSURE” light

Question 5

🟧 L/R BOTTLE DISCHARGE

Answer 5

bottle discharged OR low pressure

Question 6

🟧 DETECTOR FAULT

Answer 6

ONE or MORE of selected loops in either cargo bay failed

Question 7

CARGO FIRE DISCHARGE SWITCH
- when armed

Answer 7

1st discharge when pushed, 2nd bottle will automatically discharge with a timer set for 60min [if still armed]

Inhibits seconds discharge upon landing

Question 8

APU BOTTLE DISCHARGE SWITCH [in main gear well]
-when armed:
- pulled down gives:

HORN CUTOUT PUSH

Answer 8

Armed when APU fire control handle is pulled
Pulled gives
- closes apu fuel shutoff, bleed air valve and APU inlet door
- arms APU bottle DISCHARGE
- trips generator control relay and breaker

PUSH - makes light from blinking to steady

Question 9

Lavatory extinguisher
- temp indicator placard

Answer 9

white - normal temp
black - high temp

Question 10

ENG FIRE PROTECTION SYSTEM
- loops
- rotating ENG FIRE SWITCH
- ENG OVHT/DET powered
- ENG FIRE EXTINGUISHER powered

Answer 10

L - 2 in each engine, each overheat and fire detection
R - electrically fires a squib
E - powered by BATT BUS
E - powered by HOT BATT BUS

Question 11

APU FIRE DETECTION
- APU FIRE detection powered
- APU FIRE extinguisher powered
- loops
- protection

Answer 11

A - powered by BATT BUS
A - powered by HOT BATT BUS

Question 12

MAIN WHEEL WELL
- FIRE detection powered
- sensing of fire

Answer 12

F - powered by AC transfer bus 2 and BATT bus
S - as temp increases to predetermined limit, detector senses fire condition. 🛑 WHEEL WELL light illuminates until temperature below predetermined temp

Question 13

CARGO COMPARTMENT FIRE PROTECTION/DETECTION
- CARGO compartment smoke detection powered
- CARGO compartment fire suppression powered
- Loop configuration
- fire extinguisher bottles
- cargo fire 🟧 DISCH

Answer 13

C - powered by DC BUS 1 AND DC BUS 2
C - powered by HOT BATT BUS
L - DUAL loop through both compartments. In normal: both loops must indicate smoke, power failure/detector failure: one loop indicate smoke.
F - 2 fire extinguisher bottles installed in air conditioning mix bay on forward wing spar.
C - DISCH light may take 30 sec to illuminate. When cargo fire DISC pushed: aircraft has total time of 195 minutes to suppress the fire (180min to airport, 15min of GA)

Question 14

LAVATORY FIRE PROTECTION AND SMOKE DETECTION
- Detection
- Reset
- Extinguisher operation
- Flight deck indication

Answer 14

D - detection system monitors for presence of smoke, when detected:
- aural warning sounds
- status indicator light on lavatory smoke detection panel illuminates 🟧.
- 🟧 lavatory SMOKE light on FWD overhead panel
R - automatical reset when smoke is gone
E - operates automatically [beneath sink area in each lavatory].
F - flight deck has no indication of discharge

Question 15

🟧 OVERHEAT
🛑 FIRE

Answer 15

MASTER CATUION
MASTER FIRE WARNING