Boeing 767 Cargo Fire Suppression
Thread Starter
Joined: May 2003
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From: Canada
Boeing 767 Cargo Fire Suppression
Hello;
On the B767 (200 or 300 series) when you push the DISCH AGENT 1 button in the cockpit following a cargo fire indication what systems are activated or deactivated ? Does the electrical cargo door opening mechanism affected ?
Thanks.
On the B767 (200 or 300 series) when you push the DISCH AGENT 1 button in the cockpit following a cargo fire indication what systems are activated or deactivated ? Does the electrical cargo door opening mechanism affected ?
Thanks.
Joined: Dec 2003
Posts: 214
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From: UK
On our 767s, pushing the FWD ARMED switch arms all cargo fire extinguisher bottles and turns off both recirculation fans. Subsequently pressing the BTL DISCH switch discharges the bottles into the FWD compartment. The books make no mention of the door being affected.
Hope this is of use to you.
G W-H
Hope this is of use to you.
G W-H
Joined: Feb 2002
Posts: 554
Likes: 0
From: The Sandpit
B767 cargo fire extinguishing systems are quite varied. None that I am aware of inhibit or alter in any way the cargo door operation.
Pressing the agent discharge button will do NOTHING unless the FWD or AFT cargo fire switch is first selected. This arms the bottles, closes the respective cargo heat valves, shuts down the recirc fans, sheds galley power aswell as silencing the fire bell. For the AFT cargo the lav galley vent fans are shut down and the packs inhibited from going to high flow mode.
On dual (bottle 1 and 2 discharge) a/c the bottles are fired individually by the crew. (I think these are non ETOPS)
On a/c with a single button, when the discharge button is pressed the first bottle is immediately discharged into the relevant cargo compartment and a 30 minute timer circuit is started after which time the second bottle (and 2A) is discharged into the compartment. Should the a/c land before the 30 minutes has expired then the second bottle will discharge on touchdown.
The extinguishant is halon (bromotriflouromethane) which is heavier than air, so be careful as you open the cargo doors as this will "fall" out. As a note the correct way to revive a person who has been overcome by halon is to invert them as much as possible so the inhaled halon literaly falls out of the lungs.
Pressing the agent discharge button will do NOTHING unless the FWD or AFT cargo fire switch is first selected. This arms the bottles, closes the respective cargo heat valves, shuts down the recirc fans, sheds galley power aswell as silencing the fire bell. For the AFT cargo the lav galley vent fans are shut down and the packs inhibited from going to high flow mode.
On dual (bottle 1 and 2 discharge) a/c the bottles are fired individually by the crew. (I think these are non ETOPS)
On a/c with a single button, when the discharge button is pressed the first bottle is immediately discharged into the relevant cargo compartment and a 30 minute timer circuit is started after which time the second bottle (and 2A) is discharged into the compartment. Should the a/c land before the 30 minutes has expired then the second bottle will discharge on touchdown.
The extinguishant is halon (bromotriflouromethane) which is heavier than air, so be careful as you open the cargo doors as this will "fall" out. As a note the correct way to revive a person who has been overcome by halon is to invert them as much as possible so the inhaled halon literaly falls out of the lungs.
