Hydrostatic tail fuze AN-Mk 230 is vane operated and requires from 300 to 400 feet of air travel to arm. It is bottle shaped in appearance and has a 16 blade arming-vane assembly attached to its head. This type of fuze is sometimes used in conjunction with a nose fuze. Water pressure operates the hydrostatic mechanism that detonates the fuze. The depth at which detonation will occur can be controlled by presetting the depth setting knob. This knob, located on the side of the fuze, is marked with five possible depth settings: 25, 50, 75, 100, and 125 feet. Mod 5 and Mod 6 differ from Mod 4 by having the accuracy of their 25 foot depth setting emphasized. Mod 4 has the accuracy of the 50 foot setting emphasized. The booster of Mod 5 differs from that of Mod 4 and Mod 6 in that the firing pins of Mod 5 are welded to the booster cap and its booster charge is smaller.
The explosive components of this fuze consist of the detonator, the lead out charges, the lead in charges, a relay, and a booster charge. The detonator and lead out charges are in the firing plunger. The booster charge, the relay, and the lead in charges consist of approximately 25.5 grams (0.9 oz) of Tetryl.
Booster Mk 20 Mod 0 (22 gm Tetryl)
MIL-HDBK-146, Fuze Catalog (1982)
TM 9-1325-200, Bombs and Bomb Components (1966)
OP 2216, Volume 1 - Aircraft Bombs, Fuzes, and Associated Components (1960)
OP 1664, Volume 2 - US Explosive Ordnance (1947)
USNBD - Bombs and Fuzes, Pyrotechnics (1945)
TM 9-1904, Ammunition Inspection Guide (1944)