MIL-DTL-11891G(AT)
APPENDIX A
a.
Date received.
b.
Source address and code or compound number.
c.
Quantity of bushings.
d.
Conformance to Drawing No. 11678029.
e.
Comments regarding bushing condition.
NOTE:
If any nonconformance or unusual condition of the bushings is noted by test site
personnel, the information shall be provided to TACOM, AMSTA-TR-E/BLUE,
requesting disposition of the test samples.
A.3.3.3 Bushing sample insertion. Following a determination that all bushing samples
meet the requirements established in A.3.3.2, test site personnel shall select and insert nine (9)
bushings into simulated bores using the lubricant provided by the contractor or Flexon 845.
Insertion shall be accomplished using the MTS 321 machine or equivalent.
A.3.3.4 Bushing sample aging. Following insertion, the nine bushing samples shall be
aged for a minimum of 96 hours at an ambient room temperature of 75°F + 10°F.
A.3.3.5 Thermogravimetric analysis. Test site personnel shall select one (1) bushing
sample from the remaining six (6) samples to be submitted to an independent laboratory capable
of conducting thermogravimetric analysis (TGA). The results of the TGA must be closely
safeguarded and shall be provided with the results of the bushing endurance test for future
reference.
A.3.3.6 Bushing test machines. Following the 96 hour aging, the simulated bores shall be
placed into the bushing test machine(s). Three test machines are to be used if possible, equally
distributing the qualification samples (3 on each machine). The machine(s) will be calibrated and
zeroed prior to test initiation.
A.3.3.7 Load profile. The load profile and phase angle relationship of each test machine
shall be checked within the first hour of the initial bushing test, to ensure conformance to figures 1
and 2 (attached).
A.3.3.8 Cyclic compression. Cyclic compression load shall be from 0 to 5200 pounds
minimum at a frequency of 64 cycles per minute (cpm) +1 cpm. To ensure conformance to the
5200 pound minimum, the test machine shall be set to provide 5300 pounds of compression load.
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