Maintenance Manual STEMME S10-VT
Date of Issue: Jan. 01, 1998
Page 3-19
Amendment Nr. 14
Date: Nov. 30. 2007
A4011121_B23.doc
Doc. No. A40-11-121
3.4.2 Lubrication System
System description:
Refer to "Maintenance Manual (Heavy Maintenance) for ROTAX Engine Types
ROTAX 912 and 914 Series”, section 79
The ROTAX 914 is equipped with a dry-sump pressure lubrication system. The pumps are part of the engine.
It was necessary to modify the routing of the oil pipes between oil pump and turbocharger.
The oil tank is standard from ROTAX. It is installed behind the fire-wall on the LH side of the fuselage frame.
The oil filler cap is below a service access in the upper centre fuselage fairing.
Oil is taken in flexible pipes from the oil tank through the fire wall to the engine bay. Any flexible oil lines in the
engine compartment are shrouded by fire protective sleeves.
The oil cooler is installed on the RH side of the fuselage frame and supplied by air from the RH cowl flap.
3.4.3 Cooling System
System description:
Refer to "Maintenance Manual (Heavy Maintenance) for ROTAX Engine Types
ROTAX 912 and 914 Series”, section 75
Engine cooling is attained by liquid cooled cylinder heads, ram air cooled cylinder straight shanks and by
cooling the oil.
Liquid cooling
The radiator for the coolant is installed on the LH side of the fuselage frame, supplied by ram air from the LH
cowl flap. The refill container is installed on the forward left side of the upper fire wall. A thin tube links the
relief valve in the refill container with the overflow container, which is installed in the LH landing gear bay. The
quantity of the coolant can be checked at the scale on the overflow container and must be between min and
max markings.
The coolant lines consist of flexible coolant hoses and aluminium tubes. To allow relative movements, the
rigid components of the system are connected by flexible hoses.
Ram Air Cylinder Cooling:
Ram air for cylinder cooling is guided from the RH cowl flap through a duct to a distributor on the engine
upper side. The distributor is made of special heat-resistant GFRP.
Inlet Cowl Flaps
Oil cooler, radiator, intercooler, ram air cylinder cooling and carburetor are supplied with ram air from the LH
and RH cowl flaps in the lateral engine cowlings. To avoid low engine temperatures during high cruising
speeds or descents from high altitudes, the cowl flap aperture can be reduced with a handle on the
instrument panel. During T/O, climb and at high OAT´s, the cowl flaps should be fully open. Five reduced
apertures can be set for different conditions. It is not possible to close the cowl flaps completely as long as
the propeller-dome is open. The cowl flap control is linked to the propeller dome operation: closing of the
propeller-dome also closes the cowl flaps and opening of the propeller dome opens the cowl flaps to the
position set by the cowl flap handle.
Outlet Cowl Flap
The warmed air streams of the engine compartment via the lower outlet cowl flap. The aperture of the outlet
cowl flap, like the inlet cowl flaps, is controlled by the dome operation as well as by the cowl flap handle on
the instrument panel. The shape of the small fuselage fairing behind the outlet cowl flap keeps a slot when
the cowl flap is closed with the propeller dome, to allow a permanent ventilation of the engine compartment.
