d04926.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2/Rev. 0
78-00-00
page 3
August 01/2012
1) General notes on the exhaust system
Certification An exhaust system especially designed for universal application has
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.
Damping element The ideal is a common transversal damping element serving all 4 cylin-
ders, positioned under the engine.
NOTE: Equal length of pipes from the cylinder to damping ele-
ment is recommended for better tuning.
Distribution of
the exhaust sys-
tem
Distribution of the exhaust system into 2 separate systems is not recom-
mended. Individual mufflers on either side cause power loss and
increased engine noise.
Ball joints The 4 ball joints must be used to avoid damage due to vibration.
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 Fig. 2.
The sketch illustrates a possibility how to interconnect the exhaust
springs to prevent the vibration of these springs and thus premature
wear.
Vibrations due to improper installation and mainte-
nance is the most common reason for damage of the
exhaust system.
Be aware that locked up stresses cause cracks!
Appropriate to the installation a vibration damping sup-
port for the exhaust system has to be provided on the
airframe manufacturers side.
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