Part B: HORIZONTAL EMPENNAGES INSTALLATION
WARNING
Be careful not to damage both halves-stabilator
during their reinstallation.
NOTE
During re-assembling procedure apply MIL-PRF-
8116C (Mastinox D40, or equivalent) anticorrosive
compound to all bolt shanks.
NOTE
During re-assembling procedure install the safety
wires as applicable, using stainless steel wires with
0.8mm (0.03in) diameter.
NOTE
During re-assembling procedure install the ground
leads as applicable.
1) Refer to Figure 2 for horizontal empennages installation.
2) Gently withdraw from the container and from the concerned packing boxes, if not already
done, all the items necessary to perform the horizontal empennages re-installation. Discard
and replace the damaged items, as appropriate.
3) Ascertain that the fuselage is solidly positioned.
4) Carefully raise each half-stabilator and push it onto the torque tube, checking a clearance of
approximately 12mm to 3mm (0.47in to 0.12in) between the root chord (set in the horizontal
attitude) and the fuselage.
5) Install the attaching bolts, washers and nuts through stabilator, tie-clamp and torque tube,
without tightening the nuts (use new provided attaching items).
6) Connect half-stabilators to each other by means of the bolt to be installed coupling link-plates
at the rear spar with the plate for tail surface gust lock. Torque to 0.47÷0.52 Kgm
(40.79÷45.13 lb.in).
7) Check for a full engagement of tie-clamps on the external diameter of the torque tube and then
torque the nuts to 2.565÷2.835 Kgm (222.63÷246.07 lb.in).
8) Check for absence of horizontal and vertical backlash of the stabilator: for this check, shake
lightly each half-stabilator longitudinally, up and down and along its hinge bearings axis.
WARNING
No stabilator backlash is permissible.
9) Connect the trim tab halves to each other by means of bolt, washer and nut, interposing the
spacer. Torque the nuts to 0.47÷0.52 Kgm (40.79÷45.13 lb.in).
10) Connect the 2 (two) trim tab control rods to trim tab brackets by means of bolts, washers and
nuts, interposing, if necessary, washer p/n NAS1149F0332P or NAS1149F0316P as shims
between bracket and control rod head. Torque to 0.5±5% kgm.
11) Check that trim tab control rods are set to proper length ensuring that both ball joint ends have
the same number of engaged threads.