Fuel Tank Inerting System (FTIS)

The Fuel Tank Inerting System (FTIS) includes two sub-systems:

 - The Conditioned Service Air System (CSAS),

 - The Inert Gas Generation System (IGGS). 

  The IGGS uses an Air Separation Module (ASM) to remove oxygen from the conditioned air stream. This makes and separates the Nitrogen Enriched Air (NEA) and the Oxygen Enriched Air (OEA). The OEA is sent overboard. The Dual Flow Shut Off Valve (DFSOV) controls the NEA flow to the center fuel tank, lets the system change between low/middle/high NEA flow and isolates the IGGS from the center fuel tank. The IGGS controller supplies system control and health monitoring/BITE. The IGGS isolation valve is a solenoid valve. It is spring-loaded closed. During operation, the IGGS Controller Unit (ICU) controls the valve to open, to let conditioned air from CSAS to the IGGS. It closes if too low a pressure and/or overtemperature air come from the heat exchanger.

The CSAS gets hot air from the Engine bleed air system and decreases its temperature to a level compatible with the IGGS sub-system.

 The CSAS includes:

 - The Conditioned service air system Controller Unit (CCU), which does the system control and health monitoring BITE and has interfaces with the FWS and CFDS,

 - A CSAS isolation valve, which is a protection of the system if there is low pressure, over pressure or over temperature,

 - A heat exchanger to decrease the air temperature.

TEMPERATURE AND PRESSURE CONTROL 

The bypass valve is installed in the heat exchanger bypass duct and is controlled by the CSAS. The bypass valve adds hot air downstream of the heat exchanger to maintain the temperature within limits. On the output duct, a dual element temperature sensor and a pressure sensor monitor the temperature and the pressure before they go into the IGGS. If there is over-pressure or over-temperature, the CSAS isolation valve closes to stop the system.



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