To remove stabilator’s torque tube, disconnect electric actuator frame assembly
(7) from support (6), release control shaft from aft bellcrank assembly (3) then re-
lease horn assembly (2) from brackets (6).
3.1. STABILATOR BALANCE
If it becomes necessary to verify stabilator balance (repairs etc.) proceed as fol-
lows:
* Remove the tail fairing;
* Disconnect the moving surface from its control rod. To avoid interference
with the free rotation of the tailplane, temporarily secure control rod to the stabi-
lator support assy;
* Disconnect the trim-tab control rod;
* Secure trim-tab to stabilator to avoid any relative movement. Use adhesive
tape to avoid any influence on balance;
* Check for excessive friction or lock-ups in the moving parts;
The stabilator is balanced when the application of an 800 gr. weight at point (1)
in figure above brings stabilator to horizontal position.
If the stabilator should result “trailing-edge-heavy” it is necessary to add a few
small weights to the leading edge near the root.
A slight imbalance towards the leading edge is acceptable as it is deemed con-
servative with respect to stability.
4. VERTICAL TAIL
The vertical tail consists of an all-metal light alloy structure (fig. C-9). Vertical
stabilizer tip is made of two pieces: one fixed to the fin and the other as a part of
the rudder. The rudder composite tip can accommodate navigation and strobe
lights.
The vertical stabilizer consists of a twin spar with wrap-around stressed skin
paneling. An attachment plate (1) secures the vertical stabilizer’s front spar to the
penultimate tailcone frame while the rear spar is extended to attach directly onto
the last tailcone ordinate (2).
The rudder consists of an aluminium alloy torque box made of formed sheet
metal ribs (4) and sheet-metal skin (5).
The rudder rotates via two, specially designed, hinges (parts 6 and 7). At the top
a ball bearing (6) let the rudder to rotate. The bottom hinge pin rotates about a
bushing (8) embedded within a support flange attached to vertical stabilizer aft
spar. A bellcrank (9) secured to the rudder's lower hinge converts the rudder ped-
als cable commands.
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