TECHNICAL DESCRIPTION, OPERATING, MAINTENANCE AND REPAIR MANUAL
It is recommended to empty oil immediately after engine test run or a flight when is
warm and better escape the engine and the oil tank. For further information see the
maintenance manual for ROTAX Engine Type 912 Serie.
3.7.2 Coolant
Refer to the Operator’s Manual for all versions of ROTAX 912 engine for recommended
coolant sorts. Manufacturer recommends 50% antifreeze concentrate with additives
against corrosion and 50% pure water, or use of an equivalent premixed coolant.
Information concerning used coolant and its characteristic is noted on fire wall. Total
coolant quantity is about 1.5 litre. The coolant level in the overflow bottle should be
between min. and max. mark. In case of the coolant emptying disconnect hose leading
coolant from the radiator into the pump ( on the lowest part of the cooling system ) to
empty coolant into a suitable bottle. The liquid coolant fills into the expansion tank ( the
highest point of the cooling system ) located in the engine compartment. In addition to
that an overflow bottle is attached on the firewall to absorb coolant in case engine
overheating. Run engine to operating temperature and allow engine to cool down before
checking coolant level. Replenish as necessary. Oftentimes make checking coolant level
during the first 10 operation hours as far as the last pneumatic blebs are removed.
3.7.3 Brake fluid
Only brake fluid of J 1703c classification should be used for hydraulic brake system (
sort for middle hard or hard operation ). In general the certify automobile brake fluid
meet needed requirements. Brake fluid refilling is necessary when a low brake system
efficiency occurs due to fluid leak. The wheel brake system is filled with the brake fluid
into the tank which is located on the main brake hydraulic face ram located beyond the
rear frame of the baggage compartment.
Brake fluid gets thick during aeroplane operation and absorb air humidity. This is the
most important condition, which causes brake system failures. There is not possible to
determine time when it occurs. The best way is to precede any troubles and change brake
fluid every 2 years with new one.
3.7.4 Fuel
Recommended fuel brands are listed in a table on the page 1-24.
AVGAS 100 LL use places greater stress on the valve seats due to its high lead content
and forms increased deposits on the combustion chamber and lead sediments in the oil
system. Thus it should only be used in case of problems with vapour lock or when other
fuel types are unavailable. When the engine operating primarily (over 30% of engine
operating time) on AVGAS fuel, the Rotax engine producer recommends to make a
change of engine oil every 25 operation hours. (see List of periodical inspections of
ROTAX 912 engine and Operator’s Manual for ROTAX 912 engine)
Due to ethanol presence in E10 and its specific features it is recommended in case of
expected long period aircraft sitting to drain E10 out from a tanks, refuel them with non-
ethanol blended fuel and run the engine long enough to burn off E10 remaining in the
fuel supply system. In the case of the long time aircraft sitting with ethanol blended fuel
in the tanks, drain them out, fuel with fresh fuel and and run the engine long enough to
burn off E10 remaining in the fuel supply system. Inspect the in-line fuel filter. (see
Service instruction SI-912-016 R1 and R2 issued by Rotax engine producer)
Date: 05.10.2009 Rev. 4 WT-9 Dynamic Section 3 Page 3 - 14
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