MIL-DTL-24749B(SH)
4.4.1 Inspection lot. An inspection lot is defined as items of the same type, size, material, and style produced at
the same facility using the same purchased components, production processes and equipment, and being offered for
delivery at one time.
4.4.2 Conformance inspection sampling. As a minimum, a sample quantity of completed bond straps shall be
randomly selected for inspection and testing in accordance with the sampling plan, tables V and VI, defined herein.
Sample size depends on the classification of the defect characteristic as shown in table V. The sample size for each
characteristic is shown in table VI. As an example, for a lot size of 75 Type I bond straps use table VI to determine
the number of random samples to be tested for both major and minor defect characteristics. Return to the table V
defect characteristic column to determine if the results of a particular test are considered major or minor. If the
defect is considered "major", 20 random samples, as determined from table VI, should be selected for test and
inspection. If the defect is considered "minor", then only 6 random samples, as determined from table VI, need to
be selected for test and inspection. If one or more defects are found in any sample, then the entire lot shall be
rejected.
4.4.2.1 Test criteria. Conformance testing of Type I bond strap bosses shall be in accordance with 4.5.2.
4.5 Methods of test.
4.5.1 Visual inspection. A visual inspection shall be performed on all samples prior to testing. The inspection
shall determine that all samples are acceptable products for testing and that obvious defects are identified prior to the
start of tests. The visual inspection shall determine conformance to, but shall not be limited to, the requirements
specified in 3.2, 3.3, 3.5, and 3.7. Sample products having defects that may affect the result of testing shall be
rejected.
4.5.2 Bimetallic joint.
a. For every 400 items, or portion thereof, of a bimetallic boss production run, four specimens shall be
randomly selected for testing.
b. Two of the specimens shall be sectioned, polished, etched, and metallographically examined at 100x
magnification. Weld Heat Affected Zone (HAZ) shall be uniform across the bond line. The bond shall be uniform
and free of any indications of unbonded areas, or inclusions that exceed the acceptance standards of the base metal
specifications of ASTM B928/B928M for Aluminum, or SAE-AMS-QQ-S-763 for CRES 316L.
c. The remaining specimens shall be subjected to the bend test and the as-clad ram tensile test in accordance
with MIL-J-24445.
d.
If any specimen fails, the entire lot of 400, or portion thereof, shall be rejected.
4.5.3 Pull test. Type I and IV bond straps shall be placed in a tensile testing configuration with the load
distribution from lug to lug. The load shall be 300 pounds and maintained within ±50 pounds for 3 minutes. The
strap shall meet the requirements specified in 3.4.3.
4.5.4 Conformability and flexibility. Type I and Type IV straps shall be placed over a 1-inch diameter pin and
subjected to bending the strap 180 degrees back and forth over the pin for fifty cycles. The bending force shall be
no greater than 5 pounds. The strap shall meet the requirements specified in 3.4.4.
4.5.5 Electrical resistance. Type I and IV bond straps shall be tested for DC resistance from lug hole to lug
hole end. The strap DC resistance shall be no greater than the requirements specified in 3.4.5.
4.5.6 Permeability. Type I bond straps shall be subjected to the test method in ASTM A342/342M. The strap
permeability shall be no greater than the requirement specified in 3.4.6.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these
personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging
requirements are maintained by the Inventory Control Point s packaging activities within the Military Service or
Defense Agency, or within the military service s system commands. Packaging data retrieval is available from the
managing Military Department s or Defense Agency s automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
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