General Notes On The Exhaust System - Rotax 912 Series Installation Manual

1) General notes on the exhaust system

An exhaust system especially designed for universal application has
Certification
been developed by BRP-Powertrain. Certification according to the latest
regulations, such as FAR or EASA, must be conducted by the aircraft or
fuselage manufacturer.
1.1) The following recommendations should help the aircraft or fuse-
lage manufacturer to select a suitable exhaust system.
The ideal is a common transversal damping element serving all 4 cylin-
Damping element
ders, positioned under the engine.
NOTE:
Distribution of the exhaust system into 2 separate systems is not recom-
Distribution of
the exhaust sys-
mended. Individual mufflers on either side cause power loss and
tem
increased engine noise.
The 4 ball joints must be used to avoid damage due to vibration.
Ball joints
All ball joints have to greased regularly with heat resistant lubricant (e.g.
LOCTITE ANTISEIZE) to avoid gripping and seizing of the joints.
Vibration
Springs to be secured with safety wire to prevent FOD! See
The sketch illustrates a possibility how to interconnect the exhaust
springs to prevent the vibration of these springs and thus premature
wear.
Effectivity: 912 Series
Edition 2/Rev. 0
BRP-Powertrain
INSTALLATION MANUAL
Vibrations due to improper installation and mainte-
NOTICE
WARNUNG
nance is the most common reason for damage of the
exhaust system.
Equal length of pipes from the cylinder to damping ele-
ment is recommended for better tuning.
Be aware that locked up stresses cause cracks!
NOTICE
WARNUNG
Appropriate to the installation a vibration damping sup-
NOTICE
WARNUNG
port for the exhaust system has to be provided on the
airframe manufacturers side.
Fig. 2.
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August 01/2012