The function of the storage system is to keep the necessary quantity of oil for engine operation. It makes sure that sufficient oil is available for all components in the oil system. The storage system also holds the scavenged oil from the engine components.

The oil tank is an integral part of the accessory gearbox. It holds the engine oil supply and makes sure there is sufficient oil to the pressure pump. Venting is done by an internal opening between the accessory gearbox and the oil tank. A pressurization valve internal to the gearbox is in line with this opening to make sure there is sufficient internal pressure in the gearbox.

A sight gauge is attached to the side of the accessory gearbox. The sight gauge shows the quantity of oil that is in the tank. An oil filler port is found on the accessory gearbox. The oil filler port has a cap for oil replenishment.

The oil filler cap locks to the oil filler port. The oil filler port has a filter screen and a flap valve to prevent contamination. The flap valve holds the engine oil in the oil tank if the cap is not installed.

The magnetic drain plug is used to drain the oil from the accessory gearbox. There are four magnetic chip detectors in the forward and aft oil sump and oil lines for the scavenge port. The magnetic drain plug and the chip detectors collect metal particles from the oil. Small metal particles from gear wear will collect on the drain plug and the chip detectors. The metal particles can show if there is internal damage in the engine or the accessory gearbox. The material found in the particles can identify which section of the engine has internal damage. This gives a visual indication during servicing of the storage system.

The storage system has interfaces with the following systems/components:

• Oil Distribution System
• Electronic Chip Detector

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