Fire Protection Flashcards
Describe the the Engine Fire Detection
- DC ESS BUS 1 and 2
- 2 fire loops per engine (gaseous-type)
- Both loops must detect overheat to get a fire indication unless one loop is inop
- 2 LH/RH FWD Tube, 1 AFT Helium Tube, Pylon Tube (8 total or 4 per loop)
Describe the Engine Fire Protection
- HOT BATT BUS 1/2 powered
- 2 fire bottles (1 shot per bottle)
- Fire Handle (FSOV, HYD SOV, BLD SOV, X-BLD)
- Fire Handle and ITT Warnings will stay illuminated until no indication of fire exists
Describe the APU Fire Detection System
- DC ESS BUS 1 and 2
- 1 fire bottle
- APU Fire EXT button illuminates when APU EMER STOP button is pressed or 1 min after alarm if no action is taken
- Red Light in APU FIRE EXT button extinguishes when fire is no longer detected
APU Fire
Memory Item: APU EMER STOP - Push In (WHITE light illuminates and RED light extinguishes)
Describe the Cargo Smoke Detection System
- DC ESS BUS 2
- FWD Cargo - (3) smoke detectors (2 must be in agreement
- AFT Cargo (2) smoke detectors (both must be in agreement)
- After smoke is detected, recirculation fan automatically turns off and the ventilation outflow valve closes
Why do you think the system is designed to automatically turn off the recirculation fan and the ventilation outflow valve to the cargo compartment when smoke is detected?
- Keeps halon foam from entering the cabin
2. Stops oxygen being provided to the compartment to continue further combustion (fire ∆)
Describe the Cargo Compartment Protection
- 2 fire bottles
2. Able to extinguish fire in either compartment but not both
Which systems have fire detection and protection?
- Engines
- APU
- Cargo
- Lavatories
Cargo fire bottle deployment in-flight no smoke indication
- First push = high rate bottle arms
- Second push = high rate fires, low rate arms, then fires after 60 secs
- Third push = low rate fires immediately rather than after 60 secs
Cargo fire bottle deployment in-flight smoke indication
First push = high rate fires and then low rate arms and fires after 60 secs
Cargo fire bottle deployment on-ground smoke indication
- First push = high rate bottle fires, low rate arms
2. Second push = low rate bottle fires
Cargo fire bottle deployment on-ground no smoke indication
- First push = high rate arms
- Second push = high rate fires, low rate arms
- Third push = low rate fires
Describe the Fire Detection System Test
6-2-2-7 Rule Overhead Panel: 1. Fire Handle 1 2. Fire Handle 2 3. Cargo Smoke (FWD) Extinguisher Button 4. Cargo Smoke (AFT) Extinguisher Button 5. APU Extinguisher Button 6. APU EMER STOP Glareshield 1. Master Warning light (left) 2. Master Warning light (right) Aural 1. Fire Bell 2. Triple Chime EICAS 1. ENG 1 FIRE (CAS message) 2. ENG 2 FIRE (CAS message) 3. CARGO FWD SMOKE (CAS message) 4. CARGO AFT SMOKE (CAS message) 5. APU FIRE (CAS message) 6. FIRE (Engine 1 ITT gauge) 7. FIRE (Engine 2 ITT gauge)
How are the cockpit and cabin protected from fire?
Cockpit has 1 PBE and 1 Halon
Cabin has 3 PBE and 3 Halons (1 FWD, 2 AFT) , 1 Water FE (AFT A/C right)
What is the power source for engine and APU fire detection and protection?
- Engine Detection DC ESS BUS 1 and 2
- Engine Protection HOT BATT BUS 1/2
- APU Detection DC ESS BUS 1 and 2
- APU Protection DC ESS BUS 2
What are the 3 indications of an APU fire?
- Fire bell
- EMER STOP button Upper Half Illuminates Red
- APU FIRE displayed on EICAS
When will the APU shut down automatically for fire?
Only on the ground
What happens if the APU EMER STOP button is pushed after fire has been detected?
- APU shuts down without 1 min cooldown
- APU FSOV closes
- APU FIRE EXTG button illuminates
Will the APU fire extinguisher auto discharge?
No, per the QRH you will be instructed to press the Firex Button
What happens to the forward cargo compartment in the event smoke is detected?
- Cargo fan shuts off
2. Ventilation OFV closes
Can the cargo fire bottles be used for fires in both compartments?
No, but technically you can hit the test button and reset the arming sequence
What happens if you hold the fire test button for more than 10 secs?
APU auto shuts down
When a fire loop detects a fire, where does the signal go first?
The signal goes to MAU 1 or MAU 3 then to the EICAS
What is the temp that the wax melts and deploys fire bottle in lav?
78˚ C
How many lbs of Halon for high rate and low rate cargo fire bottles?
high rate = 13 lbs
low rare = 22 lbs
Halon 1301 Agent
What is the type of Halon used?
Halon 1301
