MIL-DTL-11891G(AT)
APPENDIX D
D.3.18.3 Visual inspection (break-in). Between each division of the break-in run, a visual
inspection shall be made of the track and the components parts. The inspection shall be in
accordance with the inspection and replacement criteria found in the table X. Hardware shall be
re-torqued if noticeably loose. After break-in, all hardware shall be torqued 100% to values as
specified in D.3.17.1.
D.3.18.4 Track pad failure (break-in). Any track pad failures which occur during break-
in do not count towards the failure criteria. Further, any failures during break-in do not reduce
the original sample size. Pads failed during break-in shall be replaced with spares and noted on a
Test Incident Report (TIR) or similar document. The pad assemblies comprising a strand after
break-in shall be denoted as the original strand sample at the start of test. Break-in mileage shall
be counted toward the qualification mileage requirement.
D.3.18.5 Spare pads. All spare pads shall be installed on a vehicle and broken in before
test start up. The break-in shall be performed in accordance with D.3.17. After completion of the
break-in run, the pads shall be removed from the vehicle and stored for future use during the
qualification test.
D.3.19 Test procedure. After completion of the break-in run, the vehicle shall be run to
the operational mode summary found in D.3.6 until the pads being tested for qualification have
met the failure criteria (see D.3.20) or have exceeded the qualification requirement of 800 miles
pad life.
D.3.19.1 Track switching. Upon completion of the first 500 mile mission scenario, the
track strands shall be removed from the vehicle, inspected for overall condition, and switched to
the opposite side. Unless otherwise specified by the Preparing Activity (see 6.2), the track pads
shall be removed from the vehicle at 800 miles.
D.3.20 Failure criteria. Failure of a contractor's pads will be established when 40% of the
original pad samples have reached wear-out and/or need replacement. For scoring purposes, the
test site shall not count multiple replacement of the same pad location.
D.3.20.1 Pad failure (break-in). Any pad failures which occur during break-in or start
damaged as a result of the following incidents will not be counted against qualification
requirements:
a. Mechanical failure of non-track parts resulting in track pad damage.
b. Sprocket damaged shoes.
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