MIL-DTL-11891G(AT)
APPENDIX B
B.3.7 Track delivery and storage. Track shoe/pad samples are to be delivered to the test
site by a date specified by the Preparing Activity. Adequate time must be allowed for test site
personnel to inspect, mark, and install the hardware so as not to impact the projected test start
date. A secured area must be made available during and after the test for each of the track
shoe/pad samples. The samples received will be placed in a shaded area that prevents direct
sunlight from shining on the track pads during storage and assembly operations. The reduction of
variables such as solar heating of the pads in a stack while other are shaded and, therefore, cooler
is mandatory. Any condition that might influence the relative performance of the track shoes/pads
are to be held as uniform as possible.
B.3.8 Contractor hardware requirements. For the qualification road test, the contractor
test sample shall consist of 74 complete T154 track shoe assemblies (see B.3.11 for strand
configuration). In addition, the following spare hardware shall be required: (a) 86 complete
T154 track shoe assemblies, to include all pads and connecting components. (b) 70 track shoe
pad assemblies (to include pad nut P/N 12268561).
B.3.8.1 Sample size. For a contractor attempting qualification of T154 pad assemblies
only, the sample size shall be 74 pads. In addition the contractor shall be required to provide 76
complete spare pad assemblies to include the pad nut.
B.3.9 Initial inspection/preparation for test. The test site shall perform a receiving
inspection of the M109 series vehicle(s) to be used for the test. The basic test vehicle(s) will be
visually and functionally checked with specific attention given to suspension, electrical systems,
hydraulic systems, and automotive controls and accessories. Any damage or improper operation
will be repaired/corrected to ensure the vehicle(s) will be capable of meeting the test requirements
defined by this appendix.
B.3.9.1 Inspection of track samples. Contractor supplied track qualification samples will
be inspected to ensure no physical damage has occurred in shipment, that the required number of
samples and spares have been provided and that all components are properly identified.
B.3.10 Track identification. To aid in failure and part life tracking, all track shoes,
including spares, shall be identified to a manufacturer by permanent sequential number/letter
codes applied to the metal portion of the shoe body. The test site shall apply the number/letter
codes to the test track shoes prior to vehicle installation.
B.3.10.1 Track assembly marking. All 160 contractor supplied track assemblies shall be
stamped with a lead designator alpha character only, prior to track break-in (see B.3.17).
Following break-in, any failed shoes shall be removed and the remaining shoes shall be
sequentially numbered. The track shoes shall be marked on both the inboard and outboard faces,
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