MIL-DTL-11891G(AT)
requirements established in Appendix C. A minimum of 1200 miles demonstrated track durability
at 20% replacement must be achieved for a track system to be considered qualified and a
contractor to be listed on the QPL.
3.5 Production requirements. Following qualification and prior to any production, the
contractor's Process Fingerprint Plan (see 3.3) with the predicted and actual target values and
ranges shall be reviewed by the contractor with the Government QAR to determine whether any
adjustments are required and the extent of any adjustments. All data generated during the
qualification of track bushings, track pads, and full track assemblies as required and in accordance
with 3.3 shall be used in the assessment of any changes to the contractor's Process Fingerprint
Plan. This final plan shall be approved by the Government, signed by the QAR and an authorized
contractor representative, and dated. This plan will then be put in place at the contractor's
plant/facilities and/or subcontractor's plant/facilities and utilized for the production of all
subsequent parts/assemblies as described in the plan. During production, the contractor shall
maintain values within the tolerances specified in the Process Fingerprint Plan.
3.5.1 First article. When specified (see 6.2), a sample shall be subjected to first article
test/inspection in accordance with 4.4.
3.5.2 Workmanship. Workmanship shall be of such quality as to assure that track
pin/bushing assemblies, track shoe pads and track shoe assemblies furnished under this
specification are free from defects that compromise, limit or reduce performance in intended use.
The bushing holes of the shoes shall be free from foreign substances that will adversely affect
bushing installation and endurance. The shoe shall be free from sharp edges, concave roadwheel
path surfaces, or other irregularities which may adversely affect operation. Molded elastomeric
components shall be free from blisters, cracks, folds, porosity, backrinding, flash, and non-fill (air
check), voids, cuts, foreign material, separation, off-register, undercure, overcure, and improper
dimensions. Bushing rubber shall be free from installation cuts and tears. Additional information,
guidance and a listing of unacceptable defects are shown in table VI. Note that no defects are
allowed on bushing assemblies.
3.5.3 GC mass spec. The Government may perform spot inspections for the purpose of
obtaining samples for pyrolysis-gas chromatography/mass spectrometry analysis. Up to five
samples may be taken at any time during a production contract. Samples will be taken from end
item cured parts. The initial part of the method will thermally desorb the additives, which are then
analyzed by gas chromatography/mass spectrometry. Following desorption of the additives, the
remaining sample will be pyrolyzed and analyzed by gas chromatography/mass spectrometry. A
baseline scan will be performed on the material submitted for qualification. Future results will be
compared with the baseline to determine that there are no new peaks appearing, no ingredients
missing, and no substitutions in subsequent production runs.
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