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Functional Description - 14024_20
Identification of a Fully or Partially Armed Fuze - 14024_22

Aviation Ordinanceman 1 - Aviation theories and other practices
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Figure 1-5.—Mechanical long-delay fuze Mk 346 Mod 0. setting shaft rotate past the minimum or maximum delay setting without further rotation of the indicator dial or damaging the mechanism. The base end of the fuze houses the timer, firing pin, detonator-rotor, lead-in, arming shaft, and the functioning delay indicator dial. On the face of the base end plate is the toothed cam, which operates as an antiremoval device. The arming shaft moves forward at impact to initiate the timer mechanism; this allows the detonator-rotor to align with the firing pin and release the antiremoval cam. Operation After the bomb is released from the aircraft, the arming assembly is freed from the arming wire and allowed to rotate. After approximately 45 revolutions of the input shaft at 1,200 rpm or more, first stage arming is complete. Usually this takes about 1.5 to 2 seconds. Upon impact, the second stage arming is initiated, which aligns the fuze firing train, starts the delay-to-burst timer, and releases the antiremoval cam. After the preselected time on the delay-to-burst timer has expired, the bomb detonates. NOTE: First stage arming must be completed before impact, and impact must be sufficient to initiate second stage arming. Arming Assemblies Mk 3, 4, and 5 Mods Mk 3, 4, and 5 arming assemblies are used with the tail assemblies of LDGPs (except Mk 84) and Snakeye weapons. They provide arming action for the Mk 346 fuze. The arming assemblies consist of a Mk 5 Mod 1 or Mod 2 fuze drive, an adapter, an appropriate drive shaft, which couples to the input shaft of the fuze, and a funnel guide. The Mod of the drive unit denotes the Mod of the assembly. 1-11







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