09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
64
WING SKIN INSTALLATION
PRE-SKIN CHECK LIST
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FWD wing truss doubler is riveted to the front spar.
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AFT truss doubler is riveted to the rear spar.
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Wing truss is bolted in the correct orientation using the appropriate hardware and
lexan anti-corrosion shims in the front.
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FWD spar FWD attach doubler is riveted in place.
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FWD spar AFT attach doubler is riveted in place.
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Wing ribs are in the proper locations and flanges are orientated the correct
directions.
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All ribs are riveted to the spars (excluding rivets shared with the gap seals on the
rear spar and the root rib).
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All flap hinge arms are in the proper locations and riveted to the ribs.
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All aileron hinge arms are in the proper locations and riveted to ribs.
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AFT rib attach angles are in place and upper hole on the spar side is left open for
gap seals.
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Aileron bellcrank outer rib support and the flap bellcrank mount rib support are
riveted in place.
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Aileron bellcrank is assembled and bolted into the wing in the proper location
using blue thread lock, safety wire, and lock washers where necessary.
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Flap bellcrank is assembled and bolted into the wing in the proper location using
blue thread lock, safety wire, and lock washers where necessary.
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Aileron cable is correctly routed, secured through the aileron cable guide, and
secured on the aileron pulley using safety wire.
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Flap teleflex is pressed into the flap bellcrank mount rib support and safety wired
in place.
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Flap teleflex is attached to the bellcrank using rod ends and appropriate
hardware. The rod end is threaded on at least 10 turns.
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Ribs have been fluted properly and they are straight enough that the skin can be
clecoed to the ribs with ease. Each rivet hole should be in a high point in the rib.
If the rivet is located in a flute or a deformity is higher than the rivet, the skin will
wrinkle.
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Remove any scratches from the skins on the side that will be inaccessible after
the skin is riveted to the wing. Use 600 or 800 grit sand paper to sand the area of
the scratch until it is no longer visible. For deeper scratches, courser grit can be
used and then finish with finer grit.
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Run wires for the desired wing tip lighting system.
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Run tubing for the pitot tube.
