CHAPTER 79
PAGE 4
MAINTENANCE MANUAL EXTRA 300LT
PAGE DATE: 7. July 2010
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 seperator
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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