MIL-DTL-62478C(AT)
3.6.7 Fungus (nonoperating). The optical coupler shall be operational after being
exposed to a fungus inoculation for 90 days at a relative humidity of 95% at 84F (29C)
(see 4.9.7).
3.6.8 Vibration (nonoperating). The optical coupler shall not be damaged, nor
experience performance degradation, after being exposed to vibration levels as shown in
Figure 3, with sinusoidal cycling time of 3 hours per axis, in accordance with the following
schedule. The sweep time shall be 15 minutes from 5 to 500 to 5 Hz (see 4.9.8).
Frequency
Vibration level
5 to 5.5 Hertz (Hz)
1 inch double amplitude
5.5 to 30 Hz
1.5 gravity (g)
30 to 50 Hz
0.033 inch double amplitude
50 to 500 Hz
4.2 g
3.6.9 Shock (nonoperating). The optical coupler shall not be damaged nor experience
performance degradation after exposure to severe shock levels with an 11 millisecond (ms)
sawtooth pulse of 40 g (peak) shock applied (see 4.9.9).
4. VERIFICATION
4.1 Classification of inspections. Inspections shall be classified as follows:
a. First article inspection (see 4.2).
b. Conformance inspection (CI) (see 4.3).
1. Examination (see 4.3.2).
2. Acceptance tests (see 4.3.3).
4.2 First article inspection. The first article inspections shall be performed on
preproduction or initial production samples as specified herein (see 3.1). Approval of the first
article sample by the Government shall not relieve the contractor of the obligation to supply
optical coupler assemblies that are fully representative of those inspected as a first article sample.
Any changes or deviation of the production units from the first article sample shall be subject to
the approval of the contracting officer.
4.2.1 In-process inspection. During fabrication of the first production optical coupler,
in-process inspections will be conducted by Government representatives to evaluate
conformance of materials and workmanship to requirements of specified documents. The
coupler and all components shall be available for inspection. These inspections shall be made at
the contractor or subcontractor s facilities prior to application of primer and paint. Processing
and welding procedures, quality system, inspection records, calibration procedures, radiographic
procedures and welder certifications will be reviewed and evaluated during the in-process
inspections.
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