MIL-DTL-62548C(AT)
3.6 Operating environment requirements. The ignition lead shall operate under the
following environmental conditions without damage of materials or degradation of performance.
3.6.1 Temperature stability. The ignition lead shall meet the requirements of 3.3.2 and
3.3.3 after exposure to a temperature range of 65 °F (54 °C), 77 °F (25 °C), and 212 °F
(100 °C) (see 4.2.7.1 through 4.2.7.3).
3.6.2 Operational altitude range. The ignition lead shall meet the requirements of 3.3.2
and 3.3.3 within a range of altitude between 1300±5 percent (%) feet below sea level and
10 000 ±2% feet above sea level (see 4.2.7.4).
3.6.3 Humidity. The ignition lead shall meet the requirements of 3.3.2 and 3.3.3 during
and after being subjected to a relative humidity of 0 to 100% for a 15 day period. Upon
completion, there shall be no corrosion or degradation in the strength of the lead (see 4.2.7.5).
3.6.4 Salt spray. The ignition lead shall meet the requirements of 3.3.2 and 3.3.3 after
being exposed to a salt fog (5% NaC1 and 95% distilled water by weight) at 90 to 95 °F (32 to
35 °C) for a minimum of 48 hours (see 4.2.7.6).
3.6.5 Sand and dust. The ignition lead insulation resistance and maximum voltage
performance shall not be deteriorated by exposure to sand and dust (see 4.2.7.7).
3.6.6 Fungus. The ignition lead insulation resistance and maximum voltage performance
shall not be deteriorated when exposed to a fungus environment (see 4.2.7.8).
3.6.7 Chemical resistance. The ignition lead shall meet the requirements of 3.3.2 and
3.3.3 when exposed to the following materials in operating, non-operating and transit conditions
(see 4.2.7.9):
a. Fuel vapors per A-A-52557, ASTM D4814, MIL-DTL-5624, and MIL-DTL-16884,
or equivalents.
b. Hydraulic fluid per MIL-PRF-6083, or an equivalent.
c. Lubricating oil per MIL-PRF-7808 and MIL-PRF-23699, or equivalents.
3.6.8 Vibration. The ignition lead shall meet the requirements of 3.3.2 and 3.3.3 after
being exposed to vibration levels up to 5 gravity units (g) from 5 to 2000 to 5 hertz (Hz) for a
period of 20 minutes (see 4.2.7.10).
3.6.9 Shock.
3.6.9.1 Gun firing shock. The ignition lead shall be capable of sustaining shock
impulses of 100±10 g intensity for a 1.5±0.2 milliseconds (ms) duration in any direction without
malfunction (see 4.2.7.11.1).
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