MIL-PRF-49176B(CR)
4.2.3.1 Inspection level.
· Temperature: +50°C, (+5 -0)°C
· Temperature cycle: none
· Vibration: 2.2 g's, ±10 percent peak acceleration value at any nonresonant
frequency between 20 and 60 Hz measured at the mounting points of the
equipment. The duration of vibration shall be at least 10 minutes during each
hour of equipment operating time. The vibration shall be perpendicular to the
plane of the printed circuit board.
· Equipment on-off cycling: turn on and let temperature stabilize, hold for 3
hours, then turn off and let temperature stabilize. This cycle shall continue
throughout this requirement verification.
4.2.3.2 Parameters. The discrimination ratio θ0/θ1 shall be 3.
4.2.3.3 Failure criteria and test length. The inspections of Table III shall be performed at
least once prior to and once after the inspection of 4.2.3.1. Additional inspections of Table III may
be selected by the contractor. The results of all Table III inspections and any physical damage shall
be used to determine the success or failure of the reliability requirement. In the event of a Table III
inspection failure, the time interval between the preceding successful inspections and the failure
shall not contribute to the total cumulative hours. Verification shall continue until the total unit
hours together with the total count of relevant equipment failures permit either an accept or reject
decision in accordance with Figure 5. Only equipment "ON" time shall contribute to the total unit
hours. No single equipment's "on" time shall be less than one-half of the average operating time
of all equipment "ON" inspections.
4.2.4 Disposition of first article samples First article samples shall not be considered as part
of the procurement quantities (see 6.2.c).
4.3 Inspection procedures for quality assurance provisions. Unless otherwise specified
herein, the regulator shall be operated at +23°C, ±5°C. The input voltage shall be +9.5 to +10.0
Vdc. Unless otherwise specified, all inspection set-up and load resistor tolerances shall be ±5
percent.
4.4 Conformance inspection.
4.4.1 Group A inspection. Group A inspection shall be conducted at an ambient temperature
of +23°C, ±5°C on all regulators following the preconditioning of 3.9 and the inspection of 4.2.1.
Group A tests listed in Table III may be performed in any order. Failure of any test shall be cause
for rejection of that unit.
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