Copyright of RotorSport UK Ltd
Document number RSUK0060
Page 85 of 101 Page issue 5.1, dated 10.06.14
The locking pin bush The hinge mounting
Bushes are available with outside diameter nominally 12.0, 13.0, 13.5mm and mounting
shims nominally 0.5, 1.0 and 2.0mm thickness.
If changing the former ensure that the bush rotates freely on the inner steel bush (a light
film of LM grease should be applied) and that the bush is not pinched when the nyloc nut
is tightened.
Cabin heater.
The optional cabin heater takes warm air from the engine radiator into the cabin via a
butterfly valve operated by a pull knob on the instrument panel. Temperature is controlled
by mixing this air with the cooler air coming through the front vents.
Because the warm air is not circulating around the hot exhaust there is no risk of carbon
monoxide entering the cabin.
Alternatively, under MC-259, a radiator matrix is installed in the nose of the aircraft with a
heater fan. This unit takes hot water from the engine, and circulates cabin air through the
matrix in order to warm that air. This is then blown into the demist vent and into the area
between the inner and outer body skins, and back through side vents to the occupants.
Control is via the same push/pull knob on the panel, which initially operates a microswitch
to turn on the fan, and then opens the water valve.