DRAINS SYSTEMThe drains system has the following functions: - To remove and discard fuel and/or oil if a leak occurs from an internal seal in specified primary components. The drains system can be used to monitor the condition of these seals. - To remove and discard all unwanted liquids collected in the pylon, cowls and fairings - To collect unburned fuel from the combustion chamber following an engine shut down or a start procedure not completed. Leaks from the accessories are drained overboard via a drains mast. The items that are connected to the drains mast are: - the Air Oil Heat Exchanger (AOHE) - the hydraulic pump number 1- the hydraulic pump number 2 - the LP/HP fuel pumps - the Fuel Metering Unit (FMU) - the pneumatic starter - the IDG - the VSV actuators - the drain collector tank - the oil tank.NOTE:the two VSV actuators, the AOHE and the FMU are connected to the same drain outlet at the drains mast, as well as the IDG and the starter. But the drain tube from each actuator, the AOHE and the IDG have a sump for better source leak detection. Other tubes in the drains system remove unwanted fluids from the pylon primary structure, from the area behind the core fairings and from the LP turbine area.