MIL-DTL-11891G(AT)
6.3.1.3 Style. A style A track shoe does not have a detachable pad and the style B
incorporates detachable pad.
6.3.2 Definition of defects.
a. Blister. Void or hole in item; causes protrusion on surface when hot; may not
show on surface when cold; may be covered or open.
b. Crack. Failure of material to join together properly.
c. Nonfill. Air checks; depressions due to trapping of air at corners and edges.
d. Light stock. Insufficient material to fill mold.
e. Fold. Lapping or doubling of material resulting in crease or pleat.
f. Backrinding. Distortion at the mold line, usually in the form of wrinkles, folds,
tears, or indentations.
g. Flash rubber. Spew-out of material at mold parting line.
h. Porosity. Presence of numerous minute voids in cured material.
i. Non-knit. Weakness where rubber flows together during molding.
6.3.3 Definitions for process control.
a. Process parameter. Process parameters are associated with the process used for
the manufacture of material. Typical parameters include; time, temperature, feed
rate, pressure, etc.
b. Product characteristic. Product characteristics include: hardness, length,
diameter, specific gravity, tensile strength, concentricity, etc.
c. Control techniques. Control techniques are used for either process or product
purposes as applicable. Examples of control techniques include: Statistical
Process Control, first and last piece verifications, temperature monitoring devices
with warnings or auto processing stops, detection inspections, etc.
d. Analysis methods. Analysis methods are used for the identification of process
parameters and product characteristics. Typical analysis methods include: Design
of Experiments, Regression Analysis, Failure Modes Effect Analysis, Quality
Functional Deployment, etc.
e. Process fingerprint. Documented and detailed information that thoroughly
describes the entire process used to produce the final product. This documentation
includes: test, process parameter and product characteristic target values and
tolerances, in-process materials and process settings, and all other important and
relevant information.
6.3.3.1 Preparing activity. The military activity responsible for the preparation and
maintenance of this document and the associated Qualified Products List. The preparing activity
is responsible for qualification, and is the qualifying activity and authority.
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