Honda Aircraft Company
HA-420
SYSTEMS
POM
DESCRIPTION
HJ1-29000-005-001
October 30, 2016
1-81
Engine Oil System
The engine oil system is completely self-contained and separate from any
other aircraft fluid system. The oil system provides lubrication for the
engine bearing elements and also assists in providing engine cooling.
The engine oil system is designed to allow the engine to operate
satisfactorily with no detrimental effects during short periods of zero
gravity operation, negative gravity operation, or low oil pressure caused
by maneuvers. The engine oil tank capacity is approximately 6.1 quarts.
The engine incorporates an integral Fuel Oil Heat Exchanger (FOHX)
that provides cooling for the oil system while simultaneously heating the
fuel to prevent fuel filter icing. Heated fuel is then used by the engine.
No heated fuel returns to the fuel tanks.
An oil pressure sensor is located on the engine accessory gearbox to
measure the supply oil pressure. The engine low pressure and high
pressure warning level is a variable value continuously calculated by the
FADEC. An Engine Oil Temperature Sensor is also provided.
The engine incorporates an electronic oil level sensor which is the
primary means of sensing oil level. Level is displayed on the STATUS
synoptic page as amber LOW or green NORM whenever on the ground
with the engine shut down (decluttered at other times). A higher
resolution reading of oil quantity can be achieved by means of a sight
glass on the outboard side of the engine visible through the oil service
door.
The oil is electrically monitored by a chip detector which detects metallic
debris in the lubrication system. The engine also incorporates an
electronic sensor which indicates impending and actual oil filter bypass.
The indication of both impending and actual filter bypass is suppressed if
the engine oil is extremely cold to preclude nuisance bypass indications.
FOR TRAINING PURPOSES ONLY
