Embraer EMB145, Operation Manual

Page: 1880 / 2662

AIRPLANE
OPERATIONS
MANUAL
POWERPLANT
DECEMBER 20, 2002
2-10-15
Page
3
Code
01
ENGINE SUMPS
There are four engine sumps that encompass five main-shaft bearings,
four bevel-gear bearings, and six carbon seals. These sumps are as
follows: fan sump, front sump, center sump and aft sump.
LUBRICATING OIL SCAVENGE SYSTEM
Air and oil are removed from each of the sumps and directed to
individual scavenge inlets on the oil pump. The scavenge section of
the pump includes five pumping elements and has separate inlets for
each of the engine sumps and the accessory gearbox. Each of the
sump inlets to the pump includes a debris monitor with magnetic chip
collector and screen in order to protect the pumping elements. The
gearbox sump inlet to the pump contains only a screen.
LUBRICATING OIL VENT SYSTEM
All the engine sumps are vented to the accessory gearbox. The oil tank
also vents to the gearbox through a core-external line that contains a
tank-pressurizing valve. A Tank Vent Valve is located upstream of the
pressurizing valve and is vented to the atmosphere.
The gearbox acts as an air/oil separator removing any oil contained in
the vent air. The air vented by the gearbox breather is conducted
through a transfer tube and dumped to the core exhaust.