CHAPTER 79
PAGE 4
MAINTENANCE MANUAL EXTRA 330LX
PAGE DATE: 1. March 2011
Normal flight
During normal flight, the weighted ball valve at the top of the
oil separator is open, allowing blow-by gases from the
engine crankcase to be vented from the breather port to the
top of the oil separator and out through the overboard
breather line. The top ball valve of the oil valve is closed and
the bottom ball valve is open, allowing oil to flow from the
sump fitting to the oil pump and out to the engine lubrication
points.
Figure 1 Inverted Oil System, Normal Flight
Inverted flight
When the aircraft is inverted, engine oil falls to the top of the
crankcase. The weighted ball valve in the oil separator closes,
preventing overboard loss of oil through the top of the oil
separator. Blow-by gasses from the engine crankcase are
vented from the sump to the bottom of the oil separator and
out through the overboard breather line. The top ball valve of
the oil valve is open, and the bottom valve is closed, allowing
oil to flow out from the breather port to the oil valve to the
oil pump and out to the engine lubrication points.
INVERTED OIL SYSTEM
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