panels beneath cab doors or along window frames of
some vehicles. The horizontal framework beneath
cargo and dump bodies are also sills. Sills may be
boxed-in areas or open-ended horizontal frameworks.
All sills are horizontal designs intended to bear the
upright portions of the vehicle's frame. Corrosion
protection of sill areas is essential.
Figure 2-11. Seams.
Preventive Maintenance for Rust-
a. With regard to the entire vehicle, but especially
rust-prone areas, several steps have been developed to
aid in rust prevention:
Figure 2-10. Sills.
(1) Operators should wash their equipment
daily with fresh water when operating in areas where
on the vehicle where separate pieces of metal come
salt is used to melt snow, or in areas where there is a
together. This is true whether the metals are welded
high salt concentration in the air.
together or simply in contact with one another. Aside
(2) Fiber or rubber floor mats should be
from seams working as areas where moisture collects,
permanently removed from all tactical vehicles to
the differing metals will tend to contain greater
prevent water from being trapped under mats. Such
variations of impurities with respect to one another than
trapped water will cause floor pans to rust. All mats
those found in a single casting. This greater variation of
should be removed and floorboards should be cleaned,
repaired if needed, and sprayed with nonslip flight deck
and the resultant rusting process.
covering compound, NSN 5610-00-782-5556.
b. Sections in this TB on rust-prone areas, general
(3) Drain holes, including drilled holes on the
preparation procedures, and all basic information on
underside of vehicles, should be kept clean and open to
corrosion prevention equipment and materials may also
prevent moisture accumulation.
be applied to nearly all vehicle rustproofing require-
ments. The additional objective of this TB, however,
(4) In areas with high salt concentration in the
does require good judgement and common sense on the
air, canvas covers should be placed on static vehicles in
part of rustproofers. This is especially true with regard
motor pools to reduce the amount of rain and mist
to drilling of access holes on heavy load-bearing areas
entering crew and cargo compartments.
of a vehicle. In such instances, comparable configura-
(S) Vehicles should be parked under shelter
tions within the vehicle-specific chapters of this TB
provide the best guidance.