Grob Acro II, Rigging Instructions

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3 Wing Control Connectors:
3.1 Whilst knelt in the rear fuselage facing rearwards, reach into the fuselage below the
baggage deck and connect the two aileron connectors (rear) and two airbrake
connectors (front). This is accomplished by pressing the slider on the top of each arm
and sliding it back so that the pin underneath can be lifted up into the respective ring
bearing on the wing side of the control arm. Once released the slider should move
forward to prevent the pin from disengaging with the bearing.
3.2 Get a qualified person to independently check the four wing and four control
connections before closing the baggage deck access panel and refitting the side and
front pads on the rear seat.
4 Fitting the Horizontal Stabiliser/Elevator:
4.1 Use three individuals to install the horizontal stabiliser.
4.2 Remove the horizontal stabiliser from its location in the trailer ceiling. Ensure that the
locking bolt at the front of the horizontal stabiliser is pulled completely forward.
4.3 Position the horizontal stabiliser above the fin and lower with the elevator angled
upwards. Lower the whole assembly with one person watching and guiding the elevator
housing onto the roller bearing at the top of the fin (Figures 8 & 9).
4.4 Gently lower and push back the stabiliser until it engages with the spigots in the fin. It is
in the correct position when the red line on the left side of the fin aligns with the red line
on the underside of the stabiliser (Figure 10).
4.5 Engage and wind in the locking bolt using its wingnut until it is fully in and just finger
tight (Figure 11). The wing nut should be horizontal thus allow the fibreglass cover to be
hinged up over it.
4.6 Place one finger vertically on the end of the stabiliser and gently rock it up and down to
ensure there is no movement.
4.7 Get a qualified person to independently check that the elevator connection housing is
properly located on the roller bearing. The tailplane is now securely in place.
5 Completion Activities:
5.1 Tape up the wing roots and tailplane/fin joints.
5.2 Fit the pitot tube (top) and total energy tube (bottom) on the front of the fin. Use wing
tape to secure the joint on the pitot, the total energy tube has a rubber seal.
5.3 Get a qualified person to help you do positive control checks then note the logbook that
a rig and positive check has been conducted.
5.4 Lower the belly dolly and slide the glider backwards to clear it.
5.5 Put the belly dolly in the trailer and secure.
CONGRATULATIONS, RIGGING COMPLETE