MIL-DTL-38195D
4.5.1 Table V. Unless otherwise specified (see 6.2), the test schedule shall be as shown in Table V.
4.5.2 Table VII. Schedule of optional tests as indicated in Table VII shall be conducted to determine set
compliance subsequent to changes in parts or material. All quality assurance provisions of Section 4 shall apply.
4.6 Test procedures. Test shall be conducted as specified herein. Test instruments shall be of the laboratory type
and shall have been calibrated within 30 days of the start of testing and at 6-month periods thereafter. Instruments
used in calibration should have at least five times the accuracy (see 6.3.12) of the instrument being calibrated.
Calibrated reference instruments of lesser accuracy than standard and which are not used for any other purpose may
be used for the required periodic check of test instruments. Instruments shall be calibrated at the frequencies at
which they are going to be used. Direct-reading instruments shall have at least 0.5 percent instrument manufacturer's
accuracy and shall be connected to indicate in the most accurate portion of their range. On DC instruments, the
readings shall not be made on the lower 15 percent of the scale. On AC instruments, the readings shall not be made
on the lower one-third of the scale. When the test methods call for the use of recording-type meters, the Texas
Instrument Company Model PDRHXFHXVA-Al6-XT or equal shall be used. Oscillograph galvanometer frequency
response shall be not less than 3,000 Hz. When recording meters are specified for any part of a test, turn on the
recording meters prior to starting the warm-up period of the set and record continuously for the test. The recording
meters shall be operated at a minimum speed of 6 inches-per-hour during the portions of the test where steady-state
loading conditions exist and shall be operated at a minimum speed of 6 inches-per-minute at least 30 seconds before,
during and after a load change.
4.6.1 Government performed tests. It shall be the option of the Government to perform the first article reliability
test, altitude operation (after reliability), road test, and railroad hump test at government expense at a government
installation.
4.6.2 Audio noise test. Except as specified herein, the instrumentation and procedures for the audio noise test
shall conform to MIL-STD-1474. When any component is changed, which may affect the noise limits, the number
of feet to be specified in the caution notice as required in MIL-STD-1474, shall be determined by selecting the
measurement position with the highest sound pressure levels and repositioning the microphone outward to a point
where the measured sound pressure levels fall within the specified limits. Measure the distance from the set to the
new microphone position and repeat the test for the eight positions at the new distance (see 3.5.5 and 4.5.2).
4.6.3 Railroad humping test. The railroad-humping test shall be performed in accordance with (IAW) Method
740.5c of MIL-STD-705 (see 3.4.3.1 and 4.5.2).
4.6.4 Drop test. The drop test shall be performed in accordance with (IAW) Method 740.3c of MIL-STD-705
(see 3.4.3.1 and 4.5.2):
4.6.5 Electromagnetic interference test. The electromagnetic interference test shall be performed in accordance
with (IAW) MIL-STD-461 (see 3.14 and 4.5.2).
4.6.6 Air transportability test. The set shall be tested to determine compliance with the air transportability re-
quirements (see 3.4.3.1; 3.6; and 4.5.2) (reference MIL-HDBK-1791).
4.6.7 Mobility test. The set shall be subjected to and shall pass all tests specified in SAE AS8090 for type II
mobility. After each test, the set shall be examined for wear and any other fault, and shall then perform a simulated
aircraft start. Any malfunction shall be cause for rejection (see 3.7 and 4.5.2).
4.6.8 Maintainability demonstration test. The maintainability demonstration shall be performed in accordance
with (IAW) current industry practices (reference Method 1B of MIL-HDBK-470) with assigned risk of 10 percent (φ
= 1.28) (see 3.3 and 4.5.2).
4.6.9 Endurance-reliability test. Except as specified herein, the endurance reliability test shall be conducted in
accordance with (IAW) Test Method 690.1d and 695.1a of MIL-STD-705 (reference MIL-HDBK-781) (see 3.3.1;
3.3.2; and 4.5.2).
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