MIL-DTL-3661D
4.5.4.2 Noncompliance. If a sample fails to pass group C inspection, the manufacturer shall take corrective
action on the process and on all units of product which can be corrected and which were manufactured with the
same conditions, materials, and processes, and are considered subject to the same test failure. Conformance
inspection shall be discontinued until corrective action has been taken. After the corrective action, sample units shall
be subjected to the necessary group C inspection (all inspections, or the failed inspections, at the option of the
Government). Groups A and B inspection may be reinstituted; however, final acceptance shall be withheld until the
group C inspection has shown that the corrective action was successful.
4.6 Methods of examination and test.
4.6.1 Visual and mechanical examination. Lampholders, indicator lights, indicator-light housings and
lenses shall be examined to verify that the materials, design, construction, physical dimensions, marking, and
workmanship are in accordance with the requirements of this specification and the applicable specification sheet.
4.6.2 Dielectric withstanding voltage (see 3.5.1). Lampholders, indicator lights and indicator-light
housings shall be tested in accordance with 4.6.2.1, and when specified, in accordance with 4.6.2.2 (see 3.2).
4.6.2.1 At atmospheric pressure. Lampholders, indicator lights and indicator-light housings shall be tested
in accordance with method 301 of MIL-STD-202. The following details shall apply:
(a) Test voltage: 1,000 volts, unless otherwise specified (see 3.2).
(b) Nature of potential: A.C.
(c) Duration of application: One minute for qualification and group C inspection, 5 seconds for other tests.
(d) Points of application (with specimen properly mounted on a metal panel with all associated hardware) :
(1) Between all unground, terminals and ground (with dummy lamp) .1
(2) Between lamp circuit terminals (with no lamp) . 2
4.6.2.2 At reduced barometric pressure. Lampholders, indicator lights and indicator-light housings,
designed for operation above 10,000 feet shall be tested as specified in 4.6.2.1 and in accordance with method 105
of MIL-STD-202. The following details and exceptions shall apply:
(a) Test voltage : 250 volts, unless otherwise specified (see 3.2).
(b) Test-condition letter - - -C.
4.6.3 Terminal strength (see 3.5.2). Lampholders, indicator lights and indicator-light housings shall be
4.6.3.1 Solder and screw terminals. Lampholders, indicator lights and indicator-light housings shall be
tested as follows:
(a) Test-Condition letter:
(1) Solder terminals - A.
(2) Screw terminals - E.
(b) Applied force: Solder: 2 pounds.
1
Dummy lamp means no filament.
2
For non-removable lens type design and electronically controlled indicator lights, the point of application
shall be from each terminal to ground.
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