ZZ-T-391E
The
apparstus shall consist of l rotating steel drum, having a
3.6.7.1 A p p a r a t u s .
The steel drum shall have a diameter of either 36 or 67.23
smooth flat faced rim.
inches, with a rim width sufficient to provide full
support to the one or more tires
being tested under the
loads
specified
herein.
D u r i n g the test, the apparatus shall be
located in an air space controlled at a temperature of 100° ± 5°F.
Each
sample tire shall be loaded against the drum and run con-
Procedure.
3.6.7.2
t i n u o u s l y for 48 hours at 5 miles per hour.
The rated load capacity shall conform to
loads shown in the T&RA, Inc. Y e a r b o o k .
At the conclusion of the test operation, each
tire shall be examined externally and then internally.
3.7. I d e n t i f i c a t i o n
Marking.
Unless otherwise specified (see 6.2), each tire shall
have
the
following information legibly molded or branded on or into
the
outboard
sides
of types I and III tires and on either side of type 11 tires in symbols or letters not
less than l/4-inch high; manufacturer's name or trademark, nominal tire size, date of
manufacture
of
recognizable
and
commonly
used
date
code, type, style, and compound code
(see 1.2).
Workmanship.
on the tires and on their components shall be in
All
workmanship
3.8
accordance
with
the
manufacturing
and
production standards
of
the
industrial
tire
and
industry.
component
Tires shall be correctly fabricated and quality shall be consistent
within
the
tire
manufacturer's"
or the T&RA tolerance limits, whichever arc the closer
All
corrections
and
repairs shall be within those limits of acceptability
limits.
imposed
by
the
original
equipment
manufacturer' s of the materials handling equipment
industry.
The tires and their components shall conform to the quality and grade
established by this specification, with no sharp edges, burrs, slivers, metal defect,
cracks,
blisters,
gouges,
splits,
porosity,
damage, o r permanent deformation.
Overspray
of
primer or paint on rubber shall not be considered a defect; h o w e v e r , o v e r s p r a y shall
be avoided.
4.
QUALITY
ASSURANCE
PROVISIONS
4.1
Lot
Purchases.
4.1.l
Responsibility
for
Inspection.
If
specified
in the
contract
or
purchase
order
To require inspection,
the
purchasing
agent
or
contracting
officer
should
(Note:
consider the number of tires being purchased.
A sample size is 4 tires), the supplier
responsible f o r
performance of
is
all
inspection
requirements
as specified
herein
(see
Unless
otherwise
specified in the contract or order, the supplier may use his own
6.2).
or any o t h e r facilities
suitable
for
the
performance
of
the
inspection
requirements
herein, unless
disapproved
by
the
Government.
speccified
The
Government
reserves
the
right to perform any of t h e
inspections set
forth
in
the
specification
where such
inspections
are
deemed
necessary to assure the supplies and services conform to
prescribed requirements.
I n s p e c t i o n shall be performed throughout the manufac-
4.1.2
In-Process
Inspection.
turing process
to
assure
that
no
deviation
is
made
from
the
indicated
requirements.
These shall include all processes such as preparation of chemicals for compounding, com-
Wherever a deviation is
pounding
of
rubber,
tire
assembly,
forming,
and
vulcanizing.
noted, correction shall be made.
Failure to make immediate correction may cause rejec-
tion of the affected lot of tires.
In accordance with (4.1.1), the contrac-
inspection
of
Component
and
Material.
4.1.3
tor is r e s p o n s i b l e for
insuring t h a t
components and
materials
used
are
manufactured,
sampled, examined,
and
tested in accordance with the requirements of this specification.
Te St S.
4.1.4
Material
Furnished
for
Tires and all related
materials used for
or
in
tests shall be furnished by the manufacturer without cost to
the
Government.
Sampling
for
inspection
and
acceptance
4.1.5
Sampling
for
Inspection
and
Acceptance.
shall be performed in accordance
with the provisions set
forth
in
MIL-STD-105.
A
sample
consist of 4 tires (2
size shall
tires
for
physical
examinations and
adhesion
test, and
hidden
defects)
for
each
type, in style 2 being tested.
2 tires for indoor endurance and
The inspection lot shall consist of all complete tires
of
the
4.1.6
I n s p e c t i o n Lot.
same type, style, compound
code, and size offered for acceptance at one time.
8
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