d04924.fm
INSTALLATION MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2/Rev. 0
75-00-00
page 14
August 01/2012
The measurement is based on the maximum coolant temperature and cyl-
inder head temperature according to the current requirement.
Refer to the flight test example that follows.
c) Cooling capacity of the installation too low.
Flight test exam-
ple
Calculated values (maximum values found for coolant temperature and
cylinder head temperature. Refer to the current specification of the FAA
and/or EASA).
Coolant temperature .................................. 102 °C (216 °F)
Cylinder head temperature ........................ 110 °C (230 °F)
The cylinder head temperature is 8 °C (46 °F) higher than the coolant tem-
perature.
Thus:
Coolant temperature .................................. ................ 120 °C (248 °F)
Difference cylinder head and coolant temperature ..... +8 °C (46 °F)
Total........................................................... ................ = 128 °C (262 °F)
The highest cylinder head temperature permitted is 128 °C (262 °F), so
that the max. coolant temperature is kept.
With this special application, safe operation of the engine that prevents
boiling of the coolant is possible up to a cylinder head temperature of
128 °C (262 °F).
In no case a cylinder head temperature higher than the
limit of 150 °C (300 °F) (for ROTAX 912 A/F/UL) and
135 °C (275 °F) (for ROTAX 912 S/ULS) can be de-
fined because detonation could not be sufficiently pre-
vented.
This cylinder head temperature with the limit found for
this type must be displayed constantly in the cockpit.
The indicating instrument and the Manuals must be
changed to cylinder head temperature max. 128 °C
(262 °F) geändert werden.
The design of the radiator installation must be changed
(example: cowl modifications), if the operating temper-
ature exceeds the specified limits.
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