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structure shall be designed and constructed in such a manner that its overturning moment is in
accordance with 3.2.2.2.2. When specified in the Detail Specification clear hardwood skids shall be
installed on selected trainer panels where required to facilitate handling. Materials used to fabricate
the skids shall be in accordance with 3.3.1.2.1.
All panel assemblies weighing in excess of seventy-five (75) pounds
3.7.2 Casters and jacks.
in transportation configuration shall be equipped with casters as specified in 3.7.2.1. All panel
assemblies which require Ieveling for proper operation, or which are equipped with casters shall also
reequipped with screw jacks as specified in 3.7.2.2.
3.7.2.1 Casters.
Each trainer panel assembly requiring casters shall be equipped with a
minimum of four (4) ball bearing, full swiveling, flat plate type casters which meet the requirements
of FF--C88. At least two (2) of the casters, one on each end of the trainer panel support frame,
shall be the locking type. Casters shall be fabricated of high-strength aluminum alloy and shall be
equipped with rubber or composition tread aluminum alloy wheels approximately six (6) inches in
diameter and one and one-half (1-1/2) inches in width. Extruded aluminum alloy caster mounting
plates, countersunk into the skid, or trainer base frame shall be provided on all trainers requiring
casters. Provisions shall be made for removing the casters from the metal support frame for shipping
purposes. The caster base plate shall be approximately five (5) inches wide, four (4) inches long, and
one-half (1/2) inch thick and shall be fitted with a spring loaded pin to retain the casters in a caster
storage rack on the trainer base or frame. The casters shall be capable of supporting the trainer
panel while in use for extended periods of time. Each caster shall not impose a concentrated single
point floor loading greater than 100 pounds-per-square-inch based on the following formula:
W
F=
CxN
=
Concentrated single point floor loading factor in psi
F
w
=
Total weight of trainer panel in pounds
c
=
Caster or jack pad foot print in square inches of floor area covered
N
=
Number of casters or jack pads on trainer panel
To determine floor loading without casters substitute square inches of trainer support structure in
floor contact for C x N in this formula.
Special casters. Casters shall be provided on auxiliary power-plants, engines, and
3.7.2.1.1
on trainers of special design, as directed by the Procuring Activity, and specified in the Detail
Specification.
56
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