STEMME S12, Maintenance Manual

Page: 44 / 290

DOCUMENT NUMBER:
L500-912.820 ISSUE JUL 20, 2016
AMENDMENT: 00
DATE: --
CHAPTER- PAGE 3-10
MAINTENANCE MANUAL STEMME S12
3.3.5 CONTROL OF AIR BRAKES
The air brake-levers are coupled by means of a connection tube. Travel of the levers is transmitted
via push rods and bell-crank levers to a driving lever (over-center strut) in the center fuselage,
from which it is transmitted via push rods and quick release couplings to push-pull rods in the
wing, which then move the air brakes. The push rods in the wing are supported by linear motion
ball bearings.
The air brakes are locked in retracted position by over-center-locking of the over-center strut.
The locked position can be adjusted by a stop screw at the over-center strut. The fully extended
position is determined by a fixed rubber stop, which one end of the driving lever butts upon when
this position is reached.
3.3.6 DIRECTIONAL CONTROL
From the LH and RH rudder pedal supports, control cables are led through the center fuselage to
the tail boom behind the luggage compartment, where the control cables of the left pedals and
the right pedals meet to be directed further to the rudder driving lever. The rudder driving lever
is connected to the tail wheel by a spring assy. The stops for the directional control are mounted
on the lower rudder support, the pertinent adjustment screws are located at the rudder on the
drive fitting.