STEMME S12 User Manual

DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: 
CHAPTERPAGE 313
MAINTENANCE MANUAL STEMME S12
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 is cooled by liquid cooled cylinder heads, ram air cooled cylinders 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 ap. The rell container is installed on the forward left side of the upper re
wall. A thin tube links the relief valve in the rell container with the overow container, which is
installed in the LH landing gear bay. The quantity of the coolant can be checked at the scale on
the overow container and must be between min and max markings.
The coolant lines consist of exible coolant hoses and aluminum tubes.
RAM AIR CYLINDER COOLING
Ram air for cylinder cooling is guided from the RH cowl ap through a duct to a distribution
plenum on the engine upper side. The distributor is made of special heat-resistant GFRP.
INLET COWL FLAPS
Oil cooler, radiator, inter-cooler, ram air cylinder cooling and the carburetors are supplied with
ram air from the LH and RH cowl aps in the lateral engine cowlings. To avoid low engine tem-
peratures during high cruising speeds or descents from high altitudes, the cowl ap aperture
can be reduced with a handle on the instrument panel. During T/O, climb and at high OAT´s, the
cowl aps should be fully open. Five reduced apertures can be set for dierent conditions. It is
not possible to close the cowl aps completely as long as the nose-cone is open. The cowl ap
control is linked to the nose-cone operation: closing of the nose-cone also closes the cowl aps
and opening of the nose-cone opens the cowl aps to the position set by the cowl ap handle.
OUTLET COWL FLAP
The warmed air streams exit the engine compartment via the lower outlet cowl ap. The aperture
of the outlet cowl ap, like the inlet cowl aps, is controlled by the nose-cone operation as well as
by the cowl ap handle on the instrument panel. The shape of the small fuselage fairing behind
the outlet cowl ap maintains a slot when the cowl ap is closed with the nose-cone, to allow a
permanent ventilation of the engine compartment.

STEMME S12 Specifications

General

Brand	STEMME
Model	S12
Category	Aircrafts
Language	English