page 42
May 01/2009
Effectivity: 912 Series
Edition 1 / Rev. 1
d04634
INSTALLATION MANUAL
BRP-Powertrain
11.3) General directives for exhaust-system
See Fig. 15.
A exhaust system, especially for universal application has been developed by
BRP-Powertrain. Certification to the latest requirements such as FAR or EASA
has to be conducted by the aircraft manufacturer.
The following recommendations should help the aircraft manufacturer to plan a
suitable exhaust system.
◆ NOTE: These recommendations derive from years of experience and
the results achieved are generally very good.
- A common transversal muffler serving all 4 cylinders and positioned under
the engine is favourable.
◆ NOTE: Equal length of pipes from the cylinder to muffler is recom-
mended for better tuning.
Distribution of the exhaust gases into 2 separate systems is not recom-
mended. Single mufflers on either side cause power loss and increased noise
emission.
- The 4 ball joints must be used to avoid damage due to vibration.
Be aware that locked up stresses cause cracks!
Attachment of exhaust bends by springs!
Springs to be secured with safety wire to prevent FOD!
All ball joints have to be greased regularly with heat resistant lubricant (e.g.
LOCTITE ANTISEIZE) to avoid gripping and seizing of the joints.
■ CAUTION: Vibrations due to improper installation and maintenance is the
most common reason for damage of the exhaust system.
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