MIL-DTL-3661D
4.6.17 Shock (see 3.5.14). Lampholders, indicator lights, and indicator-light housings, each with
appropriate lenses shall be tested as specified in 4.6.17.1 or, when specified (see 3.2) in accordance with 4.6.17.2.
4.6.17.1 Method I. Specimens shall be tested in accordance with method 213 of MIL-STD-202. The
following details shall apply:
(a) Mounting method - By normal mounting means. During this test, each specimen shall carry a suitable
lamp, not energized, and shall be fitted with its appropriate lens.
(b) Test-condition--B
(c) Number of blows-Three blows in each direction of the three principal axes (total of 18 blows).
(d) Measurement after shock (when applicable) contact spring pressure and contact resistance shall be
(e) Examination - After the test, lampholders, indicator lights, indicator light housings and lenses shall be
examined for chipping and cracking of materials, and loosening, bending, warping, and distortion of
parts. The lampholder shall be energized immediately after the test.
4.6.17.2 Method II. Specimens shall be tested in accordance with method 207 of MIL-STD-202. The
following details shall apply:
(a) Mounting method - By normal mounting means. During this test each specimen shall carry a suitable
lamp, not energized, and shall be fitted with the appropriate lens.
(b) Measurements after shock The specimen shall be energized immediately after the test.
(c) Examination-After the test, lampholders, indicator lights, indicator-light housings and lenses shall be
examined for chipping and cracking of materials, loosening, bending, warping, distortion of parts and
satisfactory operation.
4.6.18 Moisture resistance (see 3.5.15). Lampholders, indicator lights, indicator-light housings and lenses
shall be tested in accordance with method 106 of MIL-STD-202, except that steps 7a and 7b shall not be performed.
The following details shall apply:
(a) Mounting-Lampholders, indicator lights, and indicator-light housings shall be mounted by normal
mounting means on a noncorrosive panel positioned 15 degrees from the vertical, with the terminal end
of the lampholder, indicator light, or indicator-light housing higher than the lens end. No lens or cap
shall be installed on lampholders, indicator lights or indicator-light housings for this test. Lenses shall
be suspended by a nylon or wax string.
(b) Final measurements - Upon completion of a 24-hour drying period following step 6 of the final cycle,
the following measurement shall be made on lampholders, indicator lights, and indicator-light housings:
(1) Dielectric withstanding voltage in accordance with paragraph 4.6.2.
(c) Examination-After the test, lampholders, indicator lights, indicator-light housings and lenses shall be
examined for corrosion, removal of any material finish, decomposition, leaching out, and spreading of
constituent materials, and other defects.
4.6.19 Luminance (see 3.5.16). Indicator lights shall be tested under dark conditions using aged and
selected lamps with a 0.34 ± .02 mean spherical candlepower. An average of three readings shall be made across the
face of the lens when the unit is illuminated, except for nomenclature display types, a minimum of 10 readings shall
be taken.
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