MIL-DTL-9129G
3.5.1.1 Adhesives. Dischargers depending upon adhesives for attachment to the aircraft shall be so designed that
the tip or body assemblies may be replaced without detachment or replacement of the mounting bracket or base.
3.5.2 Screw threads. Screw threads on removable parts shall be in accordance with FED-STD-H28.
3.6 Performance. Unless otherwise specified (see 3.1), static dischargers shall meet the following performance
requirements.
3.6.1 Discharge current. Unless otherwise specified (see 3.1), the discharge current shall be not less than 10
microamperes at a potential difference of 40 kV, applied across 6 inch spacing between the discharger tip and the
3.6.2 Radio frequency discharge noise. Unless otherwise specified (see 3.1), the radio frequency total noise
voltage (root mean square (rms) value of radio frequency generated and coupled by a discharger while it is
discharging current at a rate of 50 microamperes shall be a minimum of either 40 dB (for trailing edge types) or 30 dB
(for wing tip types) below the simulated trailing edge when measured in accordance with paragraph 4.6.2.2.
3.6.2.1 Noise voltage peaks. Any peaks of noise voltage at discrete frequencies within the passband shall not
exceed the mean noise voltage by more than 20 dB, nor shall this level be permitted to occupy more than 10 percent
of total passband width.
3.6.3 Continuous discharge. Continuous discharge capability shall be a minimum of 50 microamperes for a period
of not less than 24 hours without material breakdown or other damage, and shall be capable of meeting the discharge
current, radio frequency noise and direct current resistance requirements subsequent to the continuous discharge
3.6.4 Power Dissipation (see 3.1). The discharger shall withstand a continuous power of 5 watts for a period of 15
seconds without excessive heating (refer to figure 2 for applied current requirement). The discharger shall be
considered to have failed if:
a. The post test discharger resistance exceeds the limits specified in 3.6.6.
b. The temperature rise of the discharger during the 15 second application of power exceeds 25°C.
c. The current flow, as indicated by the oscilloscope in figure 4, shows irregularities of "noise", other than
that directly due to power supply output voltage ripple.
d. The post test RF discharge noise exceeds the limits specified in 3.6.2.
3.6.5 Electrical flashover. The discharger resistance shall remain within specified resistance limits when tested in
accordance with 4.6.3. The dischargers shall be capable of meeting the discharge current and radio frequency
3.6.6 Direct current resistance. The resistance of dischargers measured from discharge points to discharger
mounting base shall be at 25°C (see 4.6.4):
a. Trailing edge mounted = 6 to 200 megohms.
b. Tip mounted = 6 to 120 megohms.
c. Resistance shall be measured with a 500 volt minimum megohmmeter.
3.6.6.1 Resistance (-60°C to +45°C). The resistance of dischargers shall remain within specified limits when
measured at the extreme temperatures of -60°C and +45°C, compared to the resistance measured at 25°C (see
4.6.4).
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