Thrush Aircraft S2R-R1340 Maintenance Manual page 225

o Support the wings at the jack points located approximately 5 feet from the wing tips
and under at least two additional ribs inboard to prevent wing movement when the
attach bolts are removed.
o Back the locknuts off of the NAS bolts in the splice blocks (see Figure 7-12) until
the end of the bolt is flush with the nut. Spray the bolt shanks with WD-40 or
equivalent lubricant.
o Remove the AN5 bolts through the locking sleeves of the tube nuts on the inboard
bolts. Back the tube nuts off several turns and apply WD-40 or equivalent lubricant
to the bolt shanks.
o Starting with the smallest diameter bolts and working to the next-to-largest, drive
the nut end of the fasteners down until the nut touches the splice block. A 4X rivet
gun may be used for this, but place an aluminum block over the bolt end/nut to
protect it. For the largest bolts, with the tube nuts, place a metal spacer between
the upper and lower tube nut ends and back the lower tube nut off until the bolt is
protruding about as much as the rest of them.
o Remove all of the nuts from the bolts and drive the bolt ends flush with the splice
block, again using an aluminum block and 4X rivet gun.
o Pry the top half of the lower splice block off of the NAS bolts by tapping aluminum
wedges between the splice block and the lower spar cap. Remove the top half of
the splice block.
o Drive the bolts flush with the lower spar cap, again working from smallest to
largest, this time using a 2X rivet gun and aluminum block.
o Using aluminum wedges tapped between the lower spar cap and the bottom half
of the splice block, loosen and remove the lower half of the splice block.
Effective: 1/1/08
THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
If the inspection is to be done using eddy current
methods, only the two outboard 5/16" bolts on each
spar cap need to be removed, and the splice blocks
can remain in place.
Extreme care must be taken to avoid damaging the
spar cap or the surface finish inside the holes
through the spar cap.
Adjusting the wing supports may ease some binding
and thereby assist with bolt removal.
* NOTE *
CAUTION
* NOTE *
11 - 3