MIL-DTL-3661D
4.6.3.2 Wire - lead terminals. Indicator lights having permanently set wire-lead terminations shall be tested
as specified in 4.6.3.1 with the following exception:
(a) Test-condition letter - C.
(b) Load: 2-1/2 pounds.
4.6.4 Solderability (see 3.5.3). Lampholders, indicator lights and indicator-light housings shall be tested in
accordance with method 208 of MIL-STD-202. The following detail shall apply:
(a) Number of terminals to be tested:
Minimum of two terminals per unit.
4.6.5 Temperature cycling (see 3.5.4). Lampholders, indicator lights and indicator-light housings mated
with an applicable lens shall be subjected to the temperature cycling test in accordance with method 102 of
MIL-STD-202. The following details and exceptions shall apply:
(a) Test-condition letter-D.
(1) Steps 2 and 4 shall be omitted.
(2) Test conducted with lamp installed but not energized.
(3) Lenses shall be tested separately at the temperature specified (see 3.2), if the lens temperature
exceeds that of the applicable lampholder or indicator-light housing.
(b) Measurement after test - with an appropriate lamp installed when applicable. The specimens shall be
energized and observed for any visual electrical malfunction; that is, low light output or intermittency.
The lens shall be observed for any visual color discrepancy ; that is, lack of color uniformity, hot spots,
or faded coloring (washout).
(c) Examination-After the test, lenses shall be examined for looseness of parts, chipping and cracking of
material, discoloration, and other damage.
4.6.6 Sand and dust (see 3.5.5). Indicator lights shall be tested in accordance with Method 110, test
condition A, of MIL-STD-202 and as follows:
(a) The indicator light shall be mounted on a rigid metal panel in such a way that the sand will not impinge
directly on it.
(b) During the test the indicator light shall not be energized.
4.6.7 Circuit continuity (see 3.5.6). Indicator lights shall be tested to determine conformance of the actual
circuit.
4.6.8 Contact resistance (see 3.5.7). The contact resistance of the lamp electrical circuit shall be tested in
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