9-11. ADDITIONAL INSPECTION CRITERIA (CONT).
MORE THAN 3/4 IN. (19 mm)
BOTTOM SIDE RAIL
Figure 9-8. Unacceptable Crossmember Damage
h. Non-Primary Components. For purposes of this criteria, non-primary components are all items such as
wall panels or hardware that are not otherwise specifically identified as primary (main) structural components
(1) Serviceability of Panels. Normal wear including oxidation (rust), slight dents and scratches and other
damage that does not affect serviceability or the structural integrity of the flatrack is permissible.
(2) Acceptable Patching. See Figure 9-9. Repairs (patches) in wall panels are permissible and may either
be an overlapping lap-welded type, an overlapping buck-riveted type or inserted butt-welded type of repair.
Lap-welded patches should overlap existing panel by at least 1/2 in. (12.7 mm). Riveted patches should overlap
existing panel by at least 2 in. (5 cm). Butt-welded patches should be flush fitting. All repairs on corrugated
sections must be neatly made, have a similar cross sectional profile and not affect the structural integrity of the
flatrack. All repairs, regardless of size, must be of a permanent nature. Rivets, or other special fasteners used for
affixing patches to panels, should be of a closed or blind mandril design. If hollow core pop rivets are used, holes
must be caulked. There is no limit on the number of patches on a wall panel provided the structural integrity of the
flatrack is not impaired. Patches must not overlap other patches.
End Wall Panels. A flatrack is unacceptable if a wall panel has any of the following deficiencies:
Any hole, tear, puncture or corrosive failure in the panel, regardless of the material of construction;
Any broken weld at juncture with main structural rail or corner post;
Inward bulging of the panel that reduces cargo space by more than 1-1/2 in. (3.8 cm) in any
direction or that restricts cargo loading;
Outward bulging of the panel that extends beyond the outside surfaces of the corner fittings.