CHAPTER 79
PAGE 5
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 16. June 2008
Any oil in the lines which fails to return to the sump during
the transition between normal and inverted flight drains into
the oil separator. This oil then returns to the sump from the
bottom of the oil separator during periods of normal flight.
Figure 2 Inverted Oil System, Inverted Flight
Maintenance Practices
The inverted oil system normally requires no maintenance.
During major overhauls or when repairs require sump re-
moval, inspect sump for excessive deposits of sludge, var-
nish, or foreign material. If sump is dirty, remove and
thoroughly clean all hoses and components; then use com-
pressed air blast for drying and cleanout before reassembly.
Cleaning
The inverted oil system must be flushed with a suitable
petroleum solvent, such as varsol, every 300 (three hundred)
hours of engine operation or when there is evidence of the
loss of oil through the breather line after normal flight.
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