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SIGNAL, PRACTICE BOMB, Mk 4 Mod 3 & 4 |
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| Description: |
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| Practice Bomb signals Mk 4 Mods 3 and 4 are essentially 10-gauge shotgun shells. They contain an expelling charge of smokeless powder and are primed with a commercial primer. A pyrotechnic or inert marker load is separated from the expelling charge by a disc and cardboard gun wad. Felt gun wads that are cemented to the cover close the end of the shell. |
| Use: |
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| The signals are used in either the miniature or the larger practice bombs. However, installed in the miniature practice bombs, the signals do not consistently produce a visible signal when dropped from an altitude of 10,000 feet or higher. Released from that heigh, the bomb enters the water or earth so quickly that the signal frequently does not have time to function. |
| Functioning: |
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| When the practice bomb in which the signal is installed strikes water or the earth, impact causes the firing pin in the nose of the bomb to impinge upon the primer of the signal. The primer ignites the expelling charge, forcing the marker load out through an opening in the bomb. The resulting flash and puff of white smoke permit observation of bombing accuracy. |
| Munition Components: |
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| Data Source: |
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| Munitions Tech Data Sheet: |
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| Bomb,Practice,Signal,MK4.pdf |
