Spark Plug Not In Accordance With Specification; Non Compliance Of Fuel Quality - Rotax 915 i A SERIES Maintenance Manual

Step

SPARK PLUG NOT IN ACCORDANCE WITH SPECIFICATION

General note If by error any of the spark plugs were installed which are not according to specification of
the engine manufacturer and/or not genuine ROTAX® parts, the following verification will
be necessary.
Step

NON COMPLIANCE OF FUEL QUALITY

General note With the use of unsuitable fuel quality (e.g. low octane fuel), depending on 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.
Independent of subsequent following inspections are required:
Step
05–50–00
Page 28
December 01 2017
BRP-Rotax
MAINTENANCE MANUAL
Procedure
11 Purge air from oil system.
See Chapter 12-20-00 section Purging the oil
12 Run engine for approx. 1 hour and replace oil and oil filter once more, as
stated above.
Spark plug not in accordance with specification
Procedure
1 Mark position of the spark plugs (e.g. cylinder 1 top) and remove all spark
plugs.
2 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-Rotax instructions for continued
airworthiness.
3 Inspect all systems for correct function.
4 Detailed inspection of affected engine components.
5
Inspect spark plug thread for damage (especially at bad burn off).
6 Differential compression check.
See Chapter 12-20-00 section Checking the compression.
7
Change oil and oil filter.
Non compliance with fuel quality
Procedure
1
Visual inspection of engine.
Oil specification not respected
system.
Effectivity: 915 i A Series
Edition 0/Rev. 0