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13.6.1. Ordnance Initiating Device General Design Requirements
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13.6.1.1. The explosive or pyrotechnic mix shall not degrade, decompose, or change chemically over its service life, causing a more sensitive device.
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13.6.1.2. Periodic testing of ordnance to verify that no sensitivity changes have occurred shall be in accordance with DoD-E-83578, Explosive Ordnance for Space Vehicles, General Specification for, unless it can be shown that sensitivity with aging is not a credible concern with the specific explosive composition.
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13.6.1.3. Ordnance should be designed for a service life of at least 10 years with a design goal of 15 years.
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13.6.1.4. The decomposition, cook-off, and melting temperatures of all explosives shall be at least 30oC higher than the maximum predicted environmental temperature to which the material will be exposed during storage, handling, transportation, and launch.
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13.6.2. Low Voltage EEDs
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13.6.2.1. One amp/one watt no-fire survivability of low voltage EEDs is required, as determined from the 0.1 percent firing level of the EED with 95 percent confidence using the Bruceton test or other statistical testing methods acceptable to the PSWG and Range Safety.
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13.6.2.2. EEDs shall be designed to withstand a constant DC firing pulse of one ampere and one watt power for a period of five minutes without initiation or deterioration of performance.
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13.6.2.3. The EED main body shall not rupture or fragment when the device is fired. Displacement or deformation of the connector and main housing is permissible; rupture or deformation of the outer end is permissible.
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13.6.2.4. The auto-ignition temperature shall not be less than 150oC.
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13.6.2.5. Carbon bridgewires and conductive mixes without bridgewires are prohibited.
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13.6.2.6. EEDs shall not fire or deteriorate in performance (if failure can create a hazard) as a result of being subjected to an electrostatic discharge of 25 kV from a 500 picofarad capacitor applied in the pin-to-case mode without a series resistor, and in the pin-to-pin mode with a 5 kilo-ohms resistor in series.
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13.6.2.7. The EED shall not initiate and will perform to specification (if failure can create a hazard) after being subjected to a 6-foot drop on to a steel plate.
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13.6.2.8. The EED shall not initiate or be damaged to the extent it is unsafe to handle after being subjected to a 40-foot drop on to a steel plate.
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13.6.2.9. Insulation resistance between pin-to-case shall not be less than 2 mega-ohms at 500 Vdc.
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13.6.2.10. The outer case of the EED main body shall be made of conductive material, preferably metal.
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13.6.2.11. RF survivability shall meet the testing criteria described in MIL-STD-1576, Electro-explosive Subsystem Safety Requirements and Test Methods for Space Systems.
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13.6.2.12. Shielding caps shall be provided and placed on the EED during shipment, storage, handling, and installation up to the point of electrical connection.
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13.6.2.12.1. The shielding cap shall have an outer shell made of conductive material that provides an RF shield and makes electrical contact with the EED case.
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13.6.2.12.2. There shall be no RF gaps around the full 360-degree mating surface between the shielding cap and EED case.
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13.6.2.12.3. The shielding cap shall be designed to accommodate the torque tool during installation.
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13.6.2.12.4. Shorting plugs (caps) shall not be used as a substitute for shielding caps.
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13.6.3. High Voltage Exploding Bridgewires
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13.6.3.1. Explosive materials shall be secondary explosives.
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Examples of secondary explosives include pentaerythritoltetranitrate (PETN) or cyclotrymethylenetrinitramine (RDX).
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13.6.3.2. Insulation resistance pin-to-case shall be designed to not be less than 50 mega-ohms at 500 Vdc.
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13.6.3.3. A voltage blocking gap shall be provided.
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13.6.3.3.1. The gap breakdown voltage shall not be less than 650 Vdc when discharged from a 0.025 +10 percent microfarad capacitor.
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13.6.3.3.2. The nominal gap breakdown voltage tolerance shall be specified and approved by the PSWG and Range Safety.
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13.6.3.4. The EBW shall not fire or deteriorate in performance (if failure can create a hazard) upon being subjected to a voltage of 125 to 130 volts root mean square (Vrms) at 60 Hz applied across the terminals or between the terminals and the EBW body for 5 minutes +10 sec.
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13.6.3.5. The EBW shall not fire or degrade to the extent that it is unsafe to handle when 230 +10 Vrms at 60 Hz is applied across the terminals or between the terminals and EBW body for 5 minutes +10 sec.
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13.6.3.6. The EBW shall not fire or deteriorate in performance (if failure can create a hazard) upon being subjected to a source of 500 +25 Vdc having an output capacitance of 1.0 +10 percent microfarads applied across the terminals or between the terminals and the EBW body for 60 to 90 seconds.
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13.6.3.7. The EBW shall not fire or deteriorate in performance (if failure can create a hazard) after exposure to that level of power equivalent to absorption by the test item of 1.0 watt average power at any frequency within each RF energy range, as specified in Table 13.1. The frequency shall be applied across the input terminals of the EBW detonator for 5.0 to 6.0 seconds.
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Table 13.1. RF Sensitivity.
Frequency (in Mhz)
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5 – 100
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Continuous Wave
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250 – 300
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Continuous Wave
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400 – 500
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Continuous Wave
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800 – 1,000
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Continuous Wave
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2,000 – 2,400
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Continuous Wave
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2,900 – 3,100
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Continuous Wave
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5,000 – 6,000
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Continuous Wave
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9,800 – 10,000
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Continuous Wave
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16,000 – 23,000
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Pulse Wave *
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32,000 – 40,000
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Pulse Wave *
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* Pulsed repetition frequency shall not be less than 100 Hz and the pulse width shall be a minimum of 1.0 microseconds.
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13.6.3.8. The EBW shall not fire or deteriorate in performance (if failure can create a hazard) as a result of being subjected to an electrostatic discharge of 25 kV from a 500 picofarad capacitor applied in the pin-to-case mode without a series resistor and in the pin-to-pin mode with a 5 kilo-ohm resistor in series.
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13.6.3.9. The autoignition temperature of the EBW shall not be less than 150oC.
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13.6.3.10. The EBW shall not initiate and shall perform to specification (if failure can create a hazard) after being subjected to a 6-foot drop on to a steel plate.
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13.6.3.11. The EBW shall not initiate or be damaged to the extent it is unsafe to handle after being subjected to a 40-foot drop on to a steel plate.
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13.6.4. Laser Initiated Devices
Note: Laser initiated devices are not anticipated to be used. If they are used they must comply with AFSPCMAN 91-710, Volume 3 section 13.6.4.
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13.6.5. Percussion Activated Devices
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13.6.5.1. Stab initiation of percussion activated devices (PADs) is prohibited.
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13.6.5.2. Each initiator shall have a positive safety interrupter feature that can be mechanically locked in place.
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13.6.5.3. The initiator and its interrupter shall be designed to withstand all transportation, handling, and installation environments.
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13.6.5.4. The interrupter safety lock shall be designed to remain in place during and after installation.
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13.6.5.5. The interrupter safety lock shall be designed to be removed after installation.
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13.6.5.6. The design shall ensure the PAD cannot be assembled without the interrupter.
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13.6.5.7. Percussion initiators shall be designed so that the operating energy is at least twice the all-fire energy.
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13.6.5.8. Percussion initiator no-fire energy shall be such that the percussion initiator shall not fire when subjected to an energy of 50 percent of the all-fire energy.
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13.6.6. Non-Explosive Initiators. Non-explosive initiators (NEI s) shall be handled on a case-by-case basis to ensure safety of the system design and shall be classified as either category A or B.
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