Rev. 5
3-13
• Check fuselage pin latching mechanisms for security and proper operation. Test
warning circuit by moving each latch independently and verifying warning light.
• Inspect each fuselage pin and all wing
retention pin bushings for wear or
cracks. Inspect the center section area
around the bushings for deformation or
cracks. Use the Main Spar Bushing
Gauge Pin to check the wear of both
ends of all of the wing retention pin
bushings. Insert the Gauge Pin into the
bushing, then rotate the Gauge Pin.
The Gauge Pin is a 'go, no-go' device.
If the 'no-go surface' contacts the
bushing (or mounting surface), the
wing retention pin bushing must be
replaced. See Figure 7.
Figure 7: Wing Retention Pin Bushing
• Inspect the center section channel, bulkheads, fasteners and stiffeners for signs of
amage or fatigue. Check the center section left and right UHMW retainer block and
roller for security and wear.
• Check the fuselage pin latching mechanisms for security and proper operation. Test
the warning circuit by unlatching each pin individually to verify it causes the switch
panel warning light to illuminate.
REAR SPAR DOUBLER
• If the W-1207B rear spar doubler has been trimmed too much, the finished airplane
may exhibit some play at the rear spar junction. This is usually discovered by
hearing a “click” and detecting in/out movement when the wing is installed.
Increasing the length of the spar doubler is not possible, so it must be removed and
replaced with a different, slightly longer, part.
• To determine which part is required, measure the in/out movement of the wing. This
will require two people.
• Begin by chocking the tires firmly, so the fully assembled airplane rocks and moves
as little as possible.
• Attach a dial caliper to the inboard wing skin as shown below and adjust it so it just
touches the side of the fuselage. (Use a spacer between the caliper and the wing
skin, if necessary, to clear the rubber wing root seal). One person can rock the
wingtip forward and aft while the other checks the indicator, and measures the total
play.
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