Refer to figure.
DRY-SUMP LUBRIFICATION SYSTEMS
Many reciprocating and turbine aircraft engines have dry sump lubrication systems. The oil supply in this type of system is carried in a tank. It includes a stack pipe at the bottom of the tank which will supply the main feed system via a pressure pump which will then circulate the oil through the engine. Scavenger pumps then return it to the tank as quickly as it accumulates in the engine sumps. A second stack pipe is generally fitted at the bottom of the tank to supply and emergency supply system. The need for a separate supply tank is apparent when considering the complications that would result if large quantities of oil were carried in the engine crankcase.
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