page 52
May 01/2007
Effectivity: 912 Series
Edition 1 / Rev. 0
d04054
INSTALLATION MANUAL
BRP-Rotax
12.5) Determination of operating limits, Coolant and necessary modifica-
tion on radiator installation
Depending on the achieved maximum values of the cylinder head temperature
and the coolant temperature following action are necessary.
1)
engine type 912 ULS/S
2)
engine type 912 UL/A/F
a)
Maximum cylinder head temperature is below operating limit. Operating with
waterless coolant, is permissible without modification to the installation.
b)
Maximum cylinder head temperature and coolant exit temperature is below
operating limit.
For operating with conventional coolant it is necessary to monitoring
constantly cylinder head temperature and coolant exit temperature.
◆
NOTE:
For detection of possible indication error an additional monitor-
ing of the cylinder head temperature is necessary which shows
an exceedingin case of coolant loss.
The aircraft manufacturer has the option of converting the coolant temperature
and the cylinder head temperature to an aircraft specific cylinder head tem-
perature. This is possible by calculating the difference between the head
material and the coolant temperature.
This is done by following the flight test procedure on page 53.
Coolant
temperature
Cylinder head
temperature
Additional instruments for
displaying coolant
temperature is necessary
b)
more than
135 °C
1)
(275 °F)
150 °C
2)
(300 °F)
Modifications to the instruments
or limit not necessary
a)
Cooling capacity too low. Check
of the installation necessary
c)
Cooling capacity too low.
Check of the installation
necessary
c)
more than
135 °C
1)
(275 °F)
150 °C
2)
(300 °F)
less than
135 °C
1)
(275 °F)
150 °C
2)
(300 °F)
less than
135 °C
1)
(275 °F)
150 °C
2)
(300 °F)
less than
120 °C (248 °F)
more than
120 °C (248 °F)
less than
120 °C (248 °F)
more than
120 °C (248 °F)
maximum values for
Conventional coolant
Waterless coolant
coolant used for tests
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