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The Mk XI nose fuse contains the initiating explosive charge or detonator. The detonator is shipped separately from the rest of the fuze and is assembled before the bomb is secured to the bomb rack. When the bomb is released the loop end of the arming wire is retained by the bomb rack. This permits the compressed arming pin spring to eject the arming pin, thus allowing the detonator spring to force the detonator into contact with the detonator stop plug. On impact the firing pin retainer carrying the firing pin is forced out of the groove provided for its retention in the fuze body. The firing pin is driven back, thereby puncturing the detonator casing, which is only about 0.02 inch thick, made of soft copper, and firing the detonator charge. The detonation is transmitted to the extrusion, booster, and explosive charge within the bomb.
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