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|  MIL-L-27160 (USAF)
d. Lamp circuit.
e. Dielectric.
4.4.3 Rejection and retest. When one system selected from a production run fails to meet
the specification, no systems still on hand or later produced will be accepted until the
extent and cause of failure are determined and appropriately corrected. The contractor
shall explain to the Government representative the cause of failure and the action taken to
preclude recurrence. After correction, all tests shall be repeated.
4.4.3.1 Individual tests may continue. For operational reasons, individual tests may be
continued pending the investigation of a sampling test failure. But final acceptance of
systems on hand or later produced shall not be made until it is determined that all systems
meet all requirements of the specification.
4.4.4 Defects in items already accepted. The investigation of a test failure could indicate
that defects may exist in systems already accepted. If so, the contractor shall fully advise
the procuring activity of all defects likely to be found and the method of correcting them.
4.5. Test methods
4.5.1 Examination of product. The lighting system shall be examined to determine
compliance with the requirements that can be checked visually.
4.5.1.1 Light leakage. The instrument shall be checked to assure conformance to 3.3.7.
Light or reflections emitted from the edge of a coverglass or from around the dial or
between openings in counters and warning flags shall not be visible when viewed from any
point on a 36-inch line. The line shall be determined by the intersection of a plane parallel
to and 18 inches from the front surface of the instrument coverglass and a horizontal plane
12 inches above the geometric center of the instrument coverglass.
4.5.2 Operation. the lighting system shall be excited with 5.0V and examined to
determine that all lamps function properly.
4.5.3 Lamp circuit. The instrument shall be opened and the lamp circuit checked as
follows. The examination shall be made prior to sealing.
a. Determine if lamps are connected in parallel.
b. Determine if the lighting circuit is connected as indicated on the wiring diagram.
c. Determine if any resistances are used to drop the input voltage to the lamps, or if any
transformers are used to vary the voltage to the lamp terminals.
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