Tecnam P92 Echo Super - 4.3 Aileron Control System

P92 Echo Super
Maintenance Manual
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4.3 Aileron control
Aileron control system uses push-pull rods and bellcranks inside wing and steel cables and pulleys inside fuselage.
Layout of flight control system inside cabin includes three pairs of pulleys which transmit movement from the two control
sticks (1), linked in parallel by a rod (2), to a small bar (3) located in cabin overhead in correspondence with main
pushrod s
issuing from half-wings. Main rods are connected to the small bar using two pins (4). The two main rods (5), are routed
through the ribs and are attached at opposite end to a bell crank (6) and a push-pull rod (7). The push-pull rod then crosses
the
wing ‟ s fake spar to transmit motion. Linkage length is adjustable.
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Figure 4-4 Aileron
control
To remove aileron, disconnect one end of push-pull rod and remove pins from hinges.
Reverse above procedure to reinstall aileron insuring that, with stick vertical, the aileron ‟ s trailing edge is aligned with
wing ‟ s trailing edge.
Through access panels located on
wing ‟ s bottom, check that the bellcrank lever is in neutral position, i.e. the inside arm at
right angle with spar axis. To remove half-wings, release pins (4) that secure short bar (3) to main rods (5). The steel cable
system is designed to insure proper cable tension without the need to check whenever the half-wings are removed. It is
however recommended that periodic checks be carried out and proper tension applied by acting on the two
tur nbuckles (8)
located behind the
cabin ‟ s aft panel.
Also check periodically that pulleys rotate freely and tolerance for entire linkage is within standards (ref. Section B).
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If control stick should feel unusually hard, reduce cable tension as this may be the primary cause for malfunction; also
check that pulleys and other parts of the link system positioned under seats are properly greased.
If control stiffness persists, check integrity of bellcranks and pulleys and insure that cable has not come off pulleys.
Alignment of moving surfaces with wing must be done using outboard trailing edge as reference. Further lateral corrections
(aircraft leans to one side) may be carried out adjusting trim tab located on left aileron trailing edge.
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Revision Date:
10-29-2007
Revision Number: 3.01