LANCE II SERVICE MANUAL
4-26. CONTROL
SURFACE BALANCING.
4-27.
CHECKING CONTROL SURFACE
BALANCE. The movable control surfaces
have
been
statically balanced at the time of installation
at the factory and normally
should not
require rebalancing. Where possible the control surfaces where set with the balance weight
on the heavy side of
the limits, to permit limited repair or
paint touch-up without adjusting
the balance weight. It should be noted however, that spar control surfaces are delivered
unpainted and the static balance will not necessarily fall within the limits provided, this is
more pronounced on the stabilators and rudders. The completed control surface, including
paint, should be within the limits given in Table IV-II. If the surface is not to be painted, the
balance weight will probably require adjustment. All replacement control surfaces, or
surfaces that have been repainted or repaired, should be rebalanced according to the
procedures given in Paragraphs4-27 thru 4-32. The static balance of the surfaces must be as
specified in Table IV-I.
Before balancing any control surface, it must be complete including tip, trim/servo tabs
and tab actuating arms or push rods with bearings as applicable, and all optional equipment
which is mounted on or in the control surface when it is flown, including paint, static wicks,
etc.
If optional equipment is added or removed after balancing, the control surface must be
rebalanced. During balancing, trim/servo tabs must be maintained in their neutral positions.
0.
4-28. CHECKING CONTROL
SURFACES FREE PLAY. The
following checks are
recommended before balancing to ascertain the amount of "freeplay" in the stabilator trim
tab
and
aileron:
a. Stabilator: Check
the stabilator for any "free play"
at its attachment points by
grasping each half near the tip and gently trying to move it up and down, fore and aft, and
in and out. No play is allowed.
b. Stabilator Trim Tab: Set the stabilator trim tab in neutral position. This neutral
position is determined
with the airplane properly
rigged per instructions given in Section
V
of this Service Manual and the trim indicator at its neutral position. Obtain a straightedge
long enough to extend from the ground up to a few inches above the trim tab trailing edge.
Place the straightedge next to the trim tab inboard (center) trailing edge, secure the
stabilator in neutral and grasping the tab, gently move it up and down, mark the limit of tab
free play on the straightedge. The overall travel (free play) must not exceed 0.15 of an inch.
The use of a dial indicator
and fixed stand
is recommended.
c. Aileron: Set the aileron in its
neutral position and secure. Obtain a
straightedge long
enough
to extend from the ground up to
a few inches above the aileron trailing
edge. Place
the straightedge next to the
aileron trailing edge and gently move
the aileron up and down,
mark the limit
of travel (free play) on the straightedge.
The overall travel (free play) must
not exceed 0.24 of an inch. Should
free play exceed the limit stated make
necessary repairs
as required to eliminate excessive free play. Grasp the aileron and move it spanwise
(inboard/outboard)
to insure maximum
end play of .035 is not exceeded.
Issued: 1/3/78
STRUCTURE
1F5
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