RAND KAR s.a. ASSEMBLY MANUAL XAIR HANUMAN 2007 October, 15
Page 74 / 88
I/ FINAL TUNING OF CONTROLS AND CONTROL SUR-
FACES.
This stage is all too often neglected. Yet, these adjustments make all the difference
between an aircraft that gives smooth, coherent response, and a cantankerous, even
dangerous beast.
1) The elevator:
Make sure the pivot bolts are not too tight against the washers.
.Elevator trim tab: first of all, check it responds in the right direction! Push the trim
lever forward: the tab should move up (so as to push the elevator down, for a nose
down response).
Second, adjust the cables so that
the trim tab is in line with the elevator
when the lever is vertical.
The trim cables must be tight, but not in excess;
number of turns wrapped on the pulley: three. Do not apply any lubricant:
here, the more friction, the better! You also need a small screw to stop the ca-
ble from slipping.
2) The ailerons:
-Get two straight tubes or rulers, about 2m (6ft) long. Two helpers will
make things easier.
-The turnbuckles must be adjusted so that:
The aileron tips are in contact with the two rulers held tight against the lead-
ing
edge and trailing edge, lying parallel to the keel, level with the inboard, wider ends
of the ailerons.
(Caution: if you place the rulers elsewhere along the wing, aileron angle will be set
differently due to wing twist).
Both control sticks in vertical position.
NOTE:
It is not a good idea to have the cables too tight; a reasonable amount of
play is preferable, so that the ailerons are not too « stiff », due to excessive friction.
When you are satisfied, do not forget to safety wire the turnbuckles and to
torque the nuts of the rod ends.
Also check that the sticks do not bind on the pitch axis: the bolts must be free.
3) The rudder:
First of all, and once again, because this bears repeating, make sure that:
THE RUDDER CABLES ARE CROSSED!!
The cables will be under slight tension when the rudder is centered; slack in all other
positions is normal. To eliminate any possibility of the cables jamming over the bolt
that ties the two rear support tubes, next to the stainless plate, it is a good idea to
make two simple leads using plastic ties and pieces of gas hose, tied to the leading
edge of the stabilizer. (D7A)
When the pedals are lined up, the rudder should be in line with the longitudinal axis
of the aircraft: the easiest way to get this is to clamp the rudder between two cleats
and set the adjustable links so that:
- the nose wheel is in line with the longitudinal axis
- the pedals are lined up
- the cables are slightly taut
Watch out those pulleys! The pulleys at the after end of the keel must be installed so
that they cannot move off of their bearings: the red mark must be visible from out-
side, (only this way will the bearing keep the pulley in place).
4) Rudder tab
(N°146) it corrects engine torque effects. Mount it on the rudder
after the first trial flights if necessary.
I4
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