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B-777F Fire Protection
Southern Air B-777F Fire Protection
Terms in this set (20)
How many fire bottles are there for the engines & APU?
Three, 2 for the engines & 1 for the APU.
Is it necessary to test the fire detection/protection systems during preflight & why?
No, because they self test on power up & are constantly monitored.
How many fire detection loops does each engine have & what are their multipurpose rolls?
Two loops per eng & they detect an eng fire or o'heat condition.
What causes a fire or o'heat warning?
Detection of the condition by both loops is required unless one loop has failed. If one loop is failed, detection by the other loop alone triggers the warning.
How many fire loops does the APU have & what is detected?
Two loops that detect fire only, no o'heat conditions.
How many loops must detect a fire in order for the APU to automatically shutdown?
Only one on the ground. In flight, both loops must be function & sensing fire.
What happened if the eng fire switch is pulled?
-Fuel is shut off (eng & spar fuel valves)
-Bleed air is shut off
-Electrical is shut off (gen field & breaker)
-Hyd is shut off
-Hyd pump is depressurized
-Thrust reverser is disarmed
-Both fire bottles are armed for discharge
What type of fire detection is used in the cargo compartment?
How many fire bottles are in the cargo fire protection system?
Five, or six on the -300's.
What happens when you push either fwd or aft cargo fire arm switch?
-Fire bottles are armed for discharge
-Flow valves are selected to the chosen compartment
-Cargo heat is shut off
-Equipment cooling is overridden (if fwd compartment)
-Shuts off bulk ventilation & activates lower crew rest evac sys (if aft compartment)
When fighting a cargo fire, what is the bottle discharge sequence on the ground?
-2 bottles discharge immediately
-1 remaining bottle is discharged after a time delay
When fighting a cargo fire, what is the bottle discharge sequence in flight?
-2 bottles discharge immediately under high flow
-The other 3 bottles are discharged at a metered rate after a time delay. If the plane lands before these 3 bottles discharge, 1 of the 3 remaining bottles discharges at a metered rate on touchdown.
What does the equipment cooling system do when the fwd cargo fire switch is armed?
It goes into o'ride mode:
-Recirc fans are shut down
-Cargo heat flow & fans are shut down
-Packs go to min flow
-O'ride valves open to vent pressurized air o'board & draw air from the flight deck for equip cooling (With high diff press at cruise alt, there is sufficient cooling, but at lower alts air flow for equip cooling is decreased by lower diff press)
What caution should be noted when equipment cooling is in o'ride mode at low alts & high ambient temps?
Possible equipment failure from o'heat due to low air flow.
After fighting a cargo fire would you expect to see the EICAS msg go away?
Not immediately because the smoke detectors can't distinguish smoke from Halon.
What are eng fire warning indications?
-Aural fire bell
-Red light in fuel control switch
-Red light in eng fire switch
What are APU fire warning indications?
-Aural fire bell
-Red light in APU fire switch
What happens when the APU fire switch is pulled?
-Fuel is shut off
-Bleed air is shut off
-Electrical is shut off (gen field breaker trips)
-Air inlet door closes
-APU shuts down (if auto shutdown failed)
-APU fire bottle is armed for discharge
If APU fire is detected, will fire bottle automatically discharge?
Yes, but only in unattended mode (both engines shutdown). In attended mode (either eng running or starting), fire bottle must be discharged manually.
What happens when the APU FIRE SHUTDOWN switch is pressed on the nose gear APU control panel?
-Shuts down the APU if auto shutdown has failed
-Arms APU fire bottle
THIS SET IS OFTEN IN FOLDERS WITH...
B-777F Flight Mgt/Navigation
B-777F Electrical System
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