
The coolant radiator may be declared as part of the cooling system on air- craft-side and so might not be a part of the Engine Type Design. Such a PAC part has been then tested and released by BRP-Rotax, but it might not be certified for the relevant engine type. In such a case the correct function in conjunction with the entire system is the responsibility of the aircraft manufacturer and must be carried out jointly with the aircraft.
SERVICE INSTRUCTION - PAC
In addition to this technical information refer to current issue of
- in general Illustrated Parts Catalog (IPC) and in particular: Chapter 75-00-00
- in general Operators Manual (OM)
- in general Installation Manual (IM)
- in general Maintenance Manual Line (MML) and in particular: Chapter 05-20-00 - section Maintenance Schedule, Chapter 12-20-00 - section Test run of engine
- in general Maintenance Manual Heavy (MMH) and in particular: Chapter 75-00-00
2.1) Material- cost and availability
Price and availability will be provided on request by ROTAX® Authorized Distributors or their independent Service Centers.
2.2) Company support information
- Any possible support by BRP-Rotax will be provided on request by ROTAX® Authorized Distributors or their independent Service Centers.
2.3) Material requirement per engine
Fig.no. | Part no. | Description | Application |
1 | 997086 | Coolant radiator |
General information on installation
The size and type of radiator should be adequate to transfer thermal ener- gy of approx. 30 kW (28.43 BTU/s) at take-off power. In an installation as depicted with the radiator (1) in a higher position than the standard supplied expansion tank (3), a water accumulator (2) has to be fitted instead of the expansion tank (3). Additionally a suitable expansion tank (3) has to be installed at the highest point of the cooling circuit.
NOTE: Experience has shown that with good airflow, a radiator with an area of 500 cm² (77.5 in²) is required for trouble-free operation.
Flow rate
The flow rate in the coolant circuit is approx. 70 l/min (18.49 USgal/min.) at 5800 rpm. At full throttle, an approximate value of around 0.75 m3/s (28.59 cu.ft/sec) can be assumed for the required cooling air flow.
Flow resistance
The flow resistance of the coolant in the optional ROTAX® radiator is correctly adjusted for the cooling system. If using other radiators, check the flow rate and cooling capacity.
Installation of the radiator
No provision has been made for attachment of the radiator(s) on the engine. The usage of rubber mounts is recommended. The radiator must be installed without distortion or stress and be free of vibrations. If a GENUINE ROTAX® radiator is not being installed, ensure sufficient cooling capacity. To attach the coolant radiator within the airframe design four fix- ation points are provided. M6 screws with a max 10 mm (0.394 in.) thread penetration must be used.
Operation - related information
The coolant flow is forced by a water pump, driven from the camshaft, from the radiator to the cylinder heads. From the top of the cylinder heads the coolant passes on to the expansion tank. Since the standard location of the radiator is below engine level, the expansion tank located on top of the engine allows for coolant expansion.