Flashcards in Fire and Overheat Protection Deck (28):
Which areas have fire detection and extinguishing provided?
- Left and Right Nacelles
- APU areas
The fire detection system for the nacelles uses how many loops?
a dual-loop sensing element mounted in parallel
The cargo compartment has __ smoke detectors installed in the ceiling.
When smoke density exceeds a predetermined level in the cargo compartment, a signal is sent to:
EICAS, power is removed from the cargo compartment fan, heater, and the cargo compartment air is shut off. Becomes ISOLATED.
The engine fire bottles are charged with what? Where are they located?
- Halon 1301
- Located in the Aft Equipment Bay
The cargo compartment FIREX bottles are designed to allow a quick discharge of Halon, followed by a slow metered discharge of approximately ___ minutes duration.
The lavatory FIREX bottle is discharged by:
a heat sensitive capsule
When an engine fire is detected, the Master Warning Switch light flashes, a fire bell sounds, an EICAS message appears and the appropriate Engine Fire push light illuminates red. Pushing the Engine Fire push light does what?
- Arms the squibs dedicated to the affected engine
- Closes the fuel, hydraulic and bleed air SOV’s
- Engine-driven generator is tripped offline
Prior to starting the APU what message must not be displayed?
APU FIRE FAIL caution message
An APU fire on the ground will cause what?
- An automatic APU shutdown
- Automatic discharge of the APU FIREX bottle
- An external horn to sound
How can the fire bell be silenced?
Press the MASTER WARNING switch lights
How can you determine that the MLG loop has shorted?
MLG OVHT FAIL caution message
Which areas have only a single loop system?
14th stage bleed air
When the L or R ENGINE FIRE PUSH switch is pressed the master warning is canceled
On a dual loop detection system, which combinations would generate a FIRE FAIL indication?
The FFOD FIREX monitor test must be accomplished prior to every flight.
False, FFOD only
You complete the TEST/WARN and one of the messages is missing. What does this mean?
One of the loops has failed the continuity test.
Loop A shows normal, Loop B shows fire. What indication, if any, is presented on EICAS?
What happens when the ENG FIRE PUSH light is pressed?
- Shuts off fuel, hydraulics, bleed air SOVs
- Trips off generator
- Arms the squibs on the firex bottles
What areas have fire detection only, no extinguishing?
- Jetpipe/ pylons
- MLG bays
- Bleed Air Duct (fuselage up to wing root)
Can an open loop detect any sort of fire?
Yes, but not in the place where it’s open.
When you push the L ENG FIRE PUSH switch, do any other switches light up? What does the indication mean?
Both BOTTLE 1 and BOTTLE 2 PUSH TO DISCH light up green.
The bottles are armed and have sufficient pressure.
Fire detection is powered by which bus? How about Fire protection?
- Detection on DC BATT BUS
- Protection on DC EMER BUS
MLG bay overheat detection is __ loop.
14th stage bleed air overheat detection is __ loop.
Engine, jetpipe, and pylon fire and overheat detection is __ loop.
APU fire detection is __ loop