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| Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines,
Grenades, Firing Devices and Sabotage Devices |
| Chapter 2 – Section 2 |
| Navy Bomb Fuzes |
| A-5 (a) Nose Fuze |
| Bombs in which used: 1-kg. practice bomb. |
| Color: Black, may have brass band. |
| Over-all length: 2 13/16 inches (less booster). |
| Over-all width: 3 inches (including fuze housing). |
| Material of construction: Cast iron. |
| Position and method of fixing in bomb: Fixed in the nose of the bomb. |
| Components of explosive train: A primer and a booster are present. |
| Fuzes likely to be found with: None. |
| Delay times: None. |
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Description: The fuze body is inside the nose of the bomb and cannot be seen; it is part of the nose of the bomb. The striker head is attached to the spindle which has an inte-gral firing pin. In the unarmed position the striker is held away from the detonator by a safety screw pin and a shear wire. When the bomb is attached to the bomb rack a small arm depresses a spring-loaded safety plunger, the shaft of which fits into a hole in the striker spindle. The safety screw pin is the withdrawn. |
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Operation: On release from the plane the spring-loaded safety plunger is forced out of the striker spindle and the fuze is armed. On impact the striker assembly is driven inward shearing the shear wire and the firing pin pierces the primer. |
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Figure 122 – A-5 (a) Bomb Fuze. |
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