Spark Plug Not In Accordance With Specification; Non Compliance With Fuel Quality - Rotax 912 iSc Maintenance Manual

3.11) Spark plug not in accordance with specification

If by error any of the spark plugs were installed which are not according to
General note
specification of the engine manufacturer and/or not genuine ROTAX parts,
the following verification will be necessary.
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3.12) Non compliance of fuel quality
With the use of unsuitable fuel quality (e.g. low octane fuel), depending on
General note
the operating condition the knock control would activate itself. This control
should prevent damage by knocking combustion.
The use of unsuitable fuel quality has to be entered in the engine log book.
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Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Spark plug not in accordance with specification
Mark position of the spark plugs (e.g. cyl. 1 top) and remove all spark plugs.
Inspect the spark plugs for damage (formation of melt beads, burn off). At
heavy melt beads or bad burn off, inspect the piston dome and cylinder wall
by periscope. If parts are damaged, the engine must be inspected, repaired
or overhauled in accordance with the BRP-Powertrain instructions for contin-
ued airworthiness.
Inspect all systems for correct function.
Detailed inspection of affected engine components.
Inspect spark plug thread for damage (especially at bad burn off).
Differential pressure check. See chapt. 12-20-00 section: 4).
Change oil and oil filter.

Non compliance with fuel quality

Visual inspection of engine
Empty the fuel system according to the instructions of cell manufacturer
Replace fuel filter
Flush fuel system
Check differential pressure
Engine test run
Procedure
Procedure
05-50-00
page 20
January 01/2012