MIL-DTL-55288E
4.5.3.1.2 Subgroup II. For this subgroup, two units from the first 50 production units shall be selected for this
group C inspection. For subsequent group C inspections, two units from each successive 500, or two every two
months, if less than 500 are produced during a two month period.
4.5.3.1.3 Subgroup III. For this subgroup, two units from the first 50 production units shall be selected for the first
group C inspection. For subsequent group C inspections, two units shall be selected from each successive 600, or
two every three months, if less than 600 are produced during this three months period.
4.5.3.1.4 Subgroup IV. For this subgroup, two units from the first 50 production units only shall be selected.
Subsequently, 2 units shall be tested every six (6) months until completion of production.
4.5.3.2 Noncompliance. The contractor shall immediately report in writing each group C failure occurrence,
including details of the failure and characteristics affected. The contractor shall immediately investigate the cause of
failure and further report the results of investigation and details of the proposed corrective action on (a) the process
and material, as applicable, and (b) all units of production which were manufactured under the same conditions and
which the Government considers subject to the same failure. Reports shall be forwarded to the responsible technical
activity designated in the contract through the Quality Assurance Representative for evaluation. After corrective
action has been taken, additional sample units shall be subjected to group C inspection (all inspections or the
inspections which the sample failed, at the option of the Government) and groups A and B inspection may be
reinstituted; however, final acceptance and shipment will be withheld until the group C re-inspection results have
shown that the corrective action was effective (see 6.4).
4.5.4 Re-inspection of conforming group C sample unit. Unless otherwise specified, sample units which have
been subjected to and passed group C inspection may be accepted on the contract or order provided all damage is
repaired and the sample units are re-subjected to and pass group A and group B inspections.
4.6 Bounce preconditioning. The antenna base assembly shall be placed in its normal operation position on the
table of the package tester, type 1000-SC, as made by the L.A.B. Corporation, Skaneateles, NY, or equal. The
package tester, shafts in phase, shall have a speed such that it is just possible to insert a .031 inch (0.79 mm) strip of
material under one corner or edge of the unit to a distance of 3 inches (76.2 mm) as the unit bounces. The unit shall
be subjected to this preconditioning for 1 minute. After bounce preconditioning, the unit shall not be repaired,
aligned, cleaned, or otherwise changed prior to subjection to acceptance inspection.
4.7 Service condition tests.
4.7.1 Temperature test (see 3.7.1). The Antenna AS-1729/VRC shall be subjected to the temperature cycle shown
in MIL-STD-810 and in the temperature graph in 4.7.1.1.
4.7.1.1 Extreme temperature cycle.
2_____________________________3 STEP 6 77°F, ±3°F,
STEP 2 150°F, (+6 - 0)°F
STEP 3 150°F,
RELATIVE HUMIDITY
(+6 - 0) °F.
MINIMUM EXPOSURE 4 HOURS
LESS THAN 75 PERCENT
OR TO THERMAL EQUILIBRIUM,
-----6--
STEP 4 -40°F, (+0 -6)°F
---1----
STEP 1 77°F, ±3°F
STEP 5 -40°F
MINIMUM EXPOSURE 72 HOURS
(+0 - 6)°F
RELATIVE HUMIDITY LESS THAN
OR TO THERMAL EQUILIBRIUM.
75 PERCENT 4_________________________5
a.
Rate of temperature change: As rapidly as possible.
b.
When measurements are taken on any step, practical thermal equilibrium shall first be obtained. Practical
thermal equilibrium is attained when the temperature of any selected surface of the equipment changes
less than 1°F during a half-hour period while the ambient temperature is steady.
c.
Humidity is uncontrolled, except on steps 1 and 6,
4.7.1.2 Temperature tests (see 3.7.1). The following measurements shall be made on Antenna AS-1729/VRC
before and after the temperature test cycle:
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