Fire Protection

Question 1

Which systems have fire detection and protection?
A
Which systems have fire detection and protection?
1. Engines
2. APU
3. Cargo
4. Lavatories
–

2
Q
What is the power source for engine and APU fire detection
and protection?
A
What is the power source for engine and APU fire detection
and protection?
1. Engine Detection DC ESS BUS 1 and 2
2. Engine Protection HOT BATT BUS 1/2
3. APU Detection DC ESS BUS 1 and 2
4. APU Protection DC ESS BUS 2
–

3
Q
Describe the the Engine Fire Detection
A
Describe the the Engine Fire Detection
1. DC ESS BUS 1 and 2
2. 2 fire loops per engine on each side, 4 total8 (gaseous-type)
3. Both loops must detect overheat to get a fire indication unless one loop is inop
–

4
Q
Describe the Engine Fire Protection
A
Describe the Engine Fire Protection
1. HOT BATT BUS 1/2 powered
2. 2 fire bottles (1 shot per bottle)
3. Both shots to one engine or one shot to each engine
3. Fire Handle (FSOV, HYD SOV, BLD SOV, X-BLD)
4. Fire Handle and ITT Warnings will stay illuminated until no
indication of fire exists
–

5
Q
Describe the APU Fire Detection System
A
Describe the APU Fire Detection System
1. DC ESS BUS 1 and 2 powered
2. 2 loops,
3.Both loops must detect overheat to get a fire indication unless one loop is inop
4. APU Fire EXT button illuminates when APU EMER STOP
button is pressed or 1 min after alarm if no action is taken
4. Red Light in APU FIRE EXT button extinguishes when fire is no longer detected
–

6
Q
APU Fire Protection
A
APU Fire Protection
1. DC ESS BUS powered
2. 1 fire bottle
APU FIRE EXTINGUISHER button illuminates when APU EMER STOP button is pressed or one minute after.
alarm if no further action is taken
The red light in the APU FIRE EXTINGUISHER button extinguishes when fire is no longer detected
–

7
Q
What is the sequence of events during an APU fire:
A
What is the sequence of events during an APU fire:
APU EMER STOP button RED light illuminates
Memory item completed - APU EMER STOP BUTTON…PUSH IN (WHITE light illuminates and RED light extinguishes)
APU FIRE EXTINGUISHER button illuminates
In the event the memory item is NOT completed, the APU FIRE EXTINGUISHER button will illuminate after 60 seconds of having an APU fire indication
–

8
Q
Will the APU automatically shut down if a fire is detected?
A
Will the APU automatically shut down if a fire is detected?
Only on the ground
–

9
Q
Describe the Cargo Smoke Detection System
A
Describe the Cargo Smoke Detection System
1. DC ESS BUS 2
2. FWD Cargo - (3) smoke detectors (2 must be in agreement,
Fan shuts off for 60sec, 45sec time for them to find a agreement.
3. AFT Cargo (2) smoke detectors (both must be in agreement)
4. After smoke is detected, recirculation fan automatically turns off
and the ventilation outflow valve closes
–

10
Q
What happens if smoke is detected in the recirculation bay?
A
What happens if smoke is detected in the recirculation bay?
* Both recirc fans deactivate
* Cargo recirc fan deactivates
* Cargo Outflow Valve closes
–

11
Q
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?
A
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?
1. Keeps halon foam from entering the cabin
2. Stops oxygen being provided to the compartment to continue
further combustion (fire ∆)
–

12
Q
Describe the Cargo Compartment Protection
A
Describe the Cargo Compartment Protection
1. 2 fire bottles 1 HRD Bottle 13 lbs Halon 1301, LRDBottle 22lbs 1301
2. Able to extinguish fire in either compartment but not both
–

13
Q
Cargo fire bottle deployment in-flight no smoke indication
A
Cargo fire bottle deployment in-flight no smoke indication
1. First push = high rate bottle arms
2. Second push = high rate fires, low rate arms, then fires after 60
secs
3. Third push = low rate fires immediately rather than after 60
secs
–

14
Q
Cargo fire bottle deployment in-flight smoke indication
A
Cargo fire bottle deployment in-flight smoke indication
First push = high rate fires and then low rate arms and fires after
60 secs
–

15
Q
Cargo fire bottle deployment on-ground smoke indication
A
Cargo fire bottle deployment on-ground smoke indication
1. First push = high rate bottle fires, low rate arms
2. Second push = low rate bottle fires
–

16
Q
Cargo fire bottle deployment on-ground no smoke indication
A
Cargo fire bottle deployment on-ground no smoke indication
1. First push = high rate arms
2. Second push = high rate fires, low rate arms
3. Third push = low rate fires
–

17
Q
What is the difference between the high-rate bottle and the low-rate
bottle? (cargo compartment)
A
What is the difference between the high-rate bottle and the low-rate
bottle? (cargo compartment)
-High-rate bottle saturates the compartment immediately (13lbs Halon 1301)
-Low-rate bottle maintains saturation over 60 mins(22lbs Halon 1301)
–

18
Q
Can cargo extinguishing be used if no smoke is detected?
A
Can cargo extinguishing be used if no smoke is detected?
Yes. The high rate bottle extinguishing button must be pushed twice: -
once to arm the bottle and once to discharge the bottle. -The low-rate
bottle automatically discharges after one minute if in flight.
–

19
Q
Describe the Fire Detection System Test
6-2-2-7 Rule
A
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)
–

20
Q
How are the cockpit and cabin protected from fire?
A
How are the cockpit and cabin protected from fire?
Cockpit has 1 PBE and 1 hand held Halon fire extinguisher
Cabin has 3 PBE and 3 Halons fire extinguisher
(1 FWD, 2 AFT) , 1 Water fire extinguisher (AFT A/C right)
–

21
Q
How are the engines and APU protected from fire?
A
How are the engines and APU protected from fire?
Engines 2 Halon fire bottles -
APU 1 Halon fire bottle dedicated to the APU only
–

22
Q
What is the power source for engine and APU fire detection
and protection?
A
What is the power source for engine and APU fire detection
and protection?
1. Engine Detection DC ESS BUS 1 and 2
2. Engine Protection HOT BATT BUS 1/2
3. APU Detection DC ESS BUS 1 and 2
4. APU Protection DC ESS BUS 2
–

23
Q
What are the 3 indications of an APU fire?
A
What are the 3 indications of an APU fire?
1. Fire bell
2. EMER STOP button Upper Half Illuminates Red
3. APU FIRE displayed on EICAS
–

24
Q
What happens if the APU EMER STOP button is pushed after
fire has been detected?
A
What happens if the APU EMER STOP button is pushed after
fire has been detected?
1. APU shuts down without 1 min cooldown
2. APU FSOV closes
3. APU FIRE EXTG button illuminates
–

25
Q
Will the APU fire extinguisher auto discharge?
A
Will the APU fire extinguisher auto discharge?
No, per the QRH you will be instructed to press the Firex Button
–

26
Q
What happens when a cargo extinguishing button is pushed and smoke
has been detected?
A
What happens when a cargo extinguishing button is pushed and smoke
has been detected?
* High-rate bottle discharges immediately
* Low-rate bottle discharges after 1 minute if the airplane is in flight
* if airplane is on the ground (WOW) the Low-Rate bottle will not
automatically discharge
–

27
Q
During flight can the low-rate bottle be discharged before the minute is
up?
A
During flight can the low-rate bottle be discharged before the minute is
up?
Yes by pushing the extinguishing button again.
–

28
Q
What happens to the forward cargo compartment in the event
smoke is detected?
A
What happens to the forward cargo compartment in the event
smoke is detected?
1. Cargo fan shuts off
2. Ventilation OFV closes
–

29
Q
Can the cargo fire bottles be used for fires in both
compartments?
A
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

30
Q
Can one bottle be used for one compartment and the other bottle for the
other compartment? (cargo compartment)
A
Can one bottle be used for one compartment and the other bottle for the
other compartment? (cargo compartment)
No. Only one compartment may be selected (FWD or AFT)
–

31
Q
What happens if you hold the fire test button for more than
10 secs?
A
What happens if you hold the fire test button for more than
10 secs?
APU auto shuts down
–

32
Q
When a fire loop detects a fire, where does the signal go
first?
A
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
–

33
Q
What is the temp that the wax melts and deploys fire bottle in
lav?
A
What is the temp that the wax melts and deploys fire bottle in
lav?
78 ̊ C
–

34
Q
How many lbs of Halon for high rate and low rate cargo fire
bottles?
A
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