XXII Water ......................................................................17-10 Cockpit and Cabin Interiors ...................................17-11 Extinguisher Types .............................................17-11 Installed Fire Extinguishing Systems.........................17-11 CO$_{2}$ Fire Extinguishing Systems............................17-11 Halogenated Hydrocarbons Fire Extinguishing  Systems...................................................................17-11 Containers...............................................................17-12 Discharge Valves....................................................17-12 Pressure Indication .................................................17-13 Two-Way Check Valve ..........................................17-13 Discharge Indicators...............................................17-13 Thermal Discharge Indicator (Red Disk) ...........17-13 Yellow Disk Discharge Indicator .......................17-13 Fire Switch .............................................................17-13 Cargo Fire Detection..................................................17-14 Cargo Compartment Classification ........................17-14 Class A................................................................17-14 Class B ................................................................17-14 Class C ................................................................17-14 Class E ................................................................17-14 Cargo and Baggage Compartment Fire  Detection and Extinguisher System .......................17-14 Smoke Detector System......................................17-15 Cargo Compartment Extinguishing System .......17-16 Lavatory Smoke Detectors.........................................17-16 Lavatory Smoke Detector System..........................17-17 Lavatory Fire Extinguisher System........................17-18 Fire Detection System Maintenance ..........................17-18 Fire Detection System Troubleshooting ....................17-20 Fire Extinguisher System Maintenance .....................17-20 Container Pressure Check ......................................17-20 Discharge Cartridges ..............................................17-20 Agent Containers....................................................17-21 Fire Prevention...........................................................17-21 Glossary ..............................................................G-1 Index ......................................................................I-1