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In the flight deck, cargo fire arming switches set the discharge to the forward or aft compartment. The discharge switch starts the fire bottle discharge sequence. A line pressure switch turns on the DISCH indication to show that the discharge sequence has started.
The two dump bottles discharge into the selected compartment as soon as you push the discharge switch. The bottles discharge quickly to extinguish the fire.
After a time delay, the metered bottles discharge slowly and at a controlled rate through the filter regulator. Halon from the metered bottles replaces the extinguishing agent leakage. This keeps the correct concentration of extinguishing agent in the cargo compartment to keep the fire extinguished for 180 minutes.
The metered bottles operate differently in flight and on the ground. If the airplane is on the ground when you push the discharge switch, one metered bottle starts to discharge after a twenty-minute delay. The discharge continues until the bottle is empty. The other metered bottles do not discharge.
If you push the discharge switch in flight, none of the metered bottles start to discharge immediately. If the airplane lands in less than twenty minutes, one metered bottle starts to discharge when the airplane lands. The other metered bottles do not discharge. If the airplane does not land in twenty minutes, all three metered bottles start to discharge twenty minutes after you push the discharge switch. The discharge continues until the bottles are empty.
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LOWER CARGO FIRE EXTINGUISHING -INTRODUCTION

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LOWER CARGO FIRE EXTINGUISHING -INTERFACES

General
The lower cargo fire extinguishing system has these interfaces:
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Cargo fire/engine control panel (P5)

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Overhead panel ARINC 629 system (OPAS)

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AIMS

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ELMS

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Cabin temperature controllers

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Left and right ASCPCs

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Left and right ECS miscellaneous cards.

Cargo Fire Extinguishing System Interfaces
These are the results when you push the FWD or AFT arm switches on the P5 panel:
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The circuit for the forward or aft flow valve arms

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The circuit for the two dump bottles arms

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The switch gives OPAS a FWD or AFT ARMED signal

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OPAS transmits the ARMED signal on the 629 buses

These are the results when you push the DISCH switch on the P5 panel:
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The selected flow valve opens

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The dump bottles discharge

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The DISCH switch gives the OPAS a DISCH signal

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OPAS transmits the DISCH signal on the 629 buses

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The in-line pressure switch turns on the DISCH light on the P5 overhead panel

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ELMS discharges the metered bottles after a delay

As the pressure in each bottle decreases, a pressure switch on the bottle sends a signal to the ELMS. The ELMS sends this data to the AIMS. The AIMS shows advisory and status messages to show that the bottle pressure is low.
Environmental Control System Interfaces
These are the results in the environmental control system when OPAS transmits the FWD ARMED signal:
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Lower recirculation fans -off

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Air conditioning packs -flow schedule 2

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Pressurization air outflow -50 percent forward, 50 percent aft

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Equipment cooling system -override mode

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Galley chiller boost fan -off

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Equipment cooling vent valve -closed.

These are the results in the environmental system when OPAS transmits the AFT ARMED signal:
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Lower recirculation fans -off

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Air conditioning packs -flow schedule 2

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Pressurization air outflow -50 percent forward, 50 percent aft

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Lav/galley vent fans -off

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Aft cargo heat valves -closed

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Bulk cargo vent fan -off

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Bulk cargo heat valves -closed.

These functions change the air flow around and through the cargo compartments. This keeps the fire extinguishing agent in the cargo compartment and keeps smoke out of the passenger compartment and flight deck.
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LOWER CARGO FIRE EXTINGUISHING -INTERFACES

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LOWER CARGO FIRE EXTINGUISHING -COMPONENT LOCATIONS

Flight Deck
The cargo fire/engine control panel is in the flight deck on the P5 overhead panel.
Lower Forward Cargo Compartment
　
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