MIL-DTL-25707F
TABLE IV. Group B inspection.
Inspection
Requirement
Test method
paragraph
paragraph
Radiation pattern - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Polarization - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
High temperature - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Temperature altitude - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Shock - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Vibration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Humidity - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Salt fog - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Seal test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
4.4.2.1.1 Sampling plan. Unless otherwise specified by contract, sampling shall consist of one unit per contract.
4.4.2.1.2 Noncompliance. If a sample fails to pass group B inspection, the manufacturer shall notify the acquiring activity
of such failure and take corrective action on the materials or processes, or both, as warranted, and on all units of product which can
be corrected and which were manufactured under essentially the same conditions with essentially the same materials and
processes, and which are considered subject to the same failure. Acceptance and shipment of product shall be discontinued until
corrective action, acceptable to the acquiring activity, has been taken. After the corrective action has been taken, group B
inspection shall be repeated on additional sample units (all inspections, or the inspection which the original sample failed, at the
option of the acquiring activity. Group A inspection may be reinstated; however, final acceptance and shipment shall be withheld
until the group B re-inspection has shown that the corrective action was successful. In the event of failure after re-inspection,
information concerning the failure and the corrective action taken shall be furnished to the cognizant preparing activity (see 6.4).
4.5 Methods of inspection.
4.5.1 Visual and mechanical. Antennas shall be examined to verify that the materials, design construction, physical dimensions,
marking, and workmanship are in accordance with applicable requirements (see 3.1).
4.5.2 VSWR (see 3.6.2). The VSWR of the antenna shall be measured as specified in 4.5.2.1. The antenna shall be mounted
in the center of a four foot diameter circular ground plane, in its normal mounting configuration, assuming the ground plane
represents the aircraft skin. In order to mount a curved antenna on a ground plane (which is flat), an intermediate fixture may be
used which mounts to the flat ground plane on its one side and simulates curved aircraft skin (matching the antenna curvature) on
its opposite side. Precautions shall be taken to insure that the reflected energy does not effect the VSWR measurements greater
than 4 percent of the maximum specified VSWR (see 3.1). The overall accuracy of VSWR measurements shall be such that the
(absolute VSWR) = (measured VSWR) ± 0.08 (maximum specified VSWR-1). VSWR measurements shall be made before and
after each environmental test specified in 4.5.7.
4.5.2.1 Network analyzer method. Measurements shall be made using a network analyzer or equivalent.
4.5.3 Sampling probe VSWR (see 3.6.3). The VSWR of the sampling probe shall be measured in accordance with 4.5.2 over
the specified frequency range (see 3.1).
4.5.4 Sampling probe attenuation measurements (see 3.6.4). Attenuation measurements shall be made using a network
analyzer or equivalent Each antenna shall be subjected to the attenuation tests both before and after completion of the
environmental tests.
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