Fire Detection / Protection Flashcards
Engine Fire Detection
- DC ESS powered
- 2 fire loops in each engine
- Both loops must detect an overheat to get a fire indication unless one loop is inop
How is Engine Fire Protection powered?
-HOT BATT BUS powered (2 bottles)
How many engine fire bottles? How many shots per bottle?
2 fire bottles, 1 shot per bottle
-Both shots to one engine or one shot to each
What happens when fire handle is pulled?
- Fuel valve is closed
- Hydraulic valve is closed
- Bleed valve is closed
How long does fire handle and ITT warnings stay illuminated?
Until no indication of fire exists
APU Fire Detection
- DC ESS powered
- 2 fire loops
- Both loops must detect an overheat to get a fire indication unless one loop is inop
How is APU fire protection powered (1 fire bottle)?
DC ESS powered
APU Fire
APU EMER STOP button RED light illuminates
APU EMER STOP button………PUSH IN
When does the APU FIRE EXTINGUISHER button illuminate?
When APU EMER STOP button is pressed or one minute after alarm if no further action is taken?
When does the APU FIRE EXTINGUISHER button extinguish?
When fire is no longer detected
How is Cargo smoke detection powered?
ESS powered
How many smoke detectors do the cargo compartments have?
- FWD cargo has 3
- AFT cargo has 2
2 in in both must be in agreement in order for a FWD/AFT CARGO warning
What happens after smoke is detected in cargo compartments?
Circulation fan automatically turns off and the ventilation outflow valve closes
How many cargo compartment fire bottles?
2 (able to extinguish fire in either compartment)
Cargo smoke INDICATION in flight
Push button 1 time
-High rate bottle fires, low rate bottle arms and fires after 60 seconds
Cargo smoke INDICATION on ground
Push button 2 times
- 1st push–high rates bottle fires, low rate bottle arms
- 2nd push–low rate bottle fires
Cargo smoke, NO INDICATION in flight
Push 3 times
- 1st push, high rate bottle arms
- 2nd push, high rate bottle fires
- 3rd push, low rate bottle fires (after 60 seconds if not pushed 3rd time)
Cargo smoke, NO INDICATION on ground
Push 3 times
- 1st push, high rate bottle arms
- 2nd push, high rate bottle fires, low rate bottle arms
- 3rd push, low rate bottle fires
How long does the high rate bottle last?
1 minute
How long does the low rate bottle last?
60 minutes
Lavatory Protection
1 fire bottle in waste container
-wax plug melts at a given temperature to discharge the bottle
FIRE DETECTION SYSTEM TEST
“6-2-7” Rule
Overhead panel- 6 lights
Overhead Panel (6 lights)
- Fire handle 1
- Fire handle 2
- Cargo smoke FWD extinguisher button
- Cargo smoke AFT extinguisher button
- APU extinguisher button
- APU EMER STOP (top half of button)
FIRE DETECTION SYSTEM TEST
“6-2-7” Rule
Glare shield (2 lights)
Aural (2)
- Master Warning light (left)
- Master Warning light (right)
- Fire bell
- Triple chime
FIRE DETECTION SYSTEM TEST
“6-2-7” Rule
EICAS (7)
- ENG 1 FIRE
- ENG 2 FIRE
- CARGO FWD SMOKE
- CARGO AFT SMOKE
- APU FIRE
- FIRE on engine 1 ITT gauge
- FIRE on engine 2 ITT gauge
What engine systems have fire detection and protection?
- Engines
- APU
- Cargo compartments
- Lavatories
How many fire extinguishers in cockpit and cabin?
Cockpit, 1 halon
Cabin, 3 halon (2 fwd, 1 aft), 1 water (aft)
How are the engines and APU protected from fire?
Engines, 2 halon bottles
APU, 1 halon fire bottle
Can both engine fire bottles be used for one engine?
Yes
Describe engine and APU fire detection system?
8 engine pneumatic fire detectors (2 loops) per engine, 2 APU pneumatic fire detectors (2 loops)
What happens when an engine fire handle is pulled?
- Closes respective engine fuel SOV
- Closes respective engine hydraulic SOV
- Closes respective engine bleed SOV
What is the indication of an APU fire?
- Fire bell
- Red stripe in the EMER STOP button
- APU FIRE is displayed on EICAS
Is the APU automatically shut down if a fire is detected?
Only on the ground
What happens when the APU EMER STOP button is pushed after a fire has been detected?
- APU shuts off immediately (no cool down)
- APU fuel SOV closes
- APU FIRE EXTG button illuminates (will illuminate after one minute if fire detected and APU EMER STOP button not pushed)
Will the APU fire extinguisher automatically discharge?
No
How many smoke detectors in the cargo compartments?
3 detectors in FWD
2 detectors in AFT
What happens to the FWD cargo compartment in the event smoke is detected?
- Recirculating fan shuts off (prevents oxygen from entering the compartment)
- Ventilation outflow valve closes (prevents halon from escaping into the passenger cabin)
How many extinguishing bottles are installed for the cargo compartments?
2 bottles for both compartments
- 1 high rate
- 1 low rate
Can one bottle be used for one compartment and the other bottle for the other compartment?
No. Only one compartment may be selected (FWD or AFT).
