d05785.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 i Series
Edition 1/Rev. 2
75-00-00
Page 20
January 01/2014
4.2.1) General notes on the cooling air ducts
Front installa-
tion
For front installation in a closed cooling, ducting of cooling air to the cylin-
ders is available. This removes the need for costly horizontal partitioning
(baffles).
NOTE: It also means that the engine remains completely on the
warm side of the engine compartment and is very easy to
access. In special cases a separate cold air supply to the
air filters must be provided.
BRP-Powertrain has developed a non-certified cooling air duct especially
for this application. Cooling air ducts are not required if the cylinder tem-
perature is within limit, see section 4.2).
Selecting cool-
ing air ducts
The following recommendations should assist the aircraft or fuselage man-
ufacturer in selecting suitable cooling air ducts.
Non-compliance can result in serious injuries or death!
Certification according to the latest regulations, such
as FAR or EASA, must be conducted by the aircraft or
fuselage manufacturer.
Cooling capacity
The cooling air ducts must be designed such that they
transfer thermal energy of approx. 6 kW (5.7 BTU/s) at
take-off performance.
Cross section of air duct
Cross section of air duct under the airflow baffle min.
100 cm
2
(15.50 in
2
).
Material
Glass fibre reinforced plastic or heat and fire resistant ma-
terial.
Attachment options
Formlocking on engine block and mounting above the cyl-
inder and the crankcase.
HINWEIS: If formlocking attachment is not suffi-
cient, additional attachment is possi-
ble using two M8 threaded lugs on the
top of the engine block.
The stated maximum permissible loads (per screw)
are valid only if using the minimum specified thread
length, and must never be exceeded.
Thread height 18 mm (0.71 in.)).
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