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Typical center electrical lead wire connection (5.0-inch motor) - 14024_66
NOZZLE AND FIN ASSEMBLIES - 14024_68

Aviation Ordinanceman 1 - Aviation theories and other practices
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Figure 2-5.—Fin protector in place. either one of the nozzles (fig. 2-3, view A) or the fin-actuating piston (fig. 2-3, view B) to the contact disc (fig. 2-3, views A and B) on the fin retainer. In the Mk 66 Mod 2, both lead wires are connected directly to the HERO filter wires which extend out of the forward end of the stabilizing rod. When the rocket is placed in the launcher, the contact disc is automatically in contact with an electrical terminal that transmits the firing impulse to the rocket. The igniter in the 5.0-inch motor (fig. 2-4) has an electrical lead wire post that protrudes through the forward bulkhead closure. The electrical lead connects the igniter to the contact band. When the rocket is placed in the launcher, the contact band is automatically in contact with an electrical terminal, which transmits the firing impulse to the rocket. Both the 2.75-inch and 5.0-inch rockets are susceptible to radio-frequency energy when they are not installed in the launchers. When stowed and shipped separately from the launcher, the Mk 4 and Mk 40 motor fins are covered with a fin protector (fig. 2-5), which is an elongated steel can. A conical-coiled steel spring riveted to the center of the base inside the fin protector makes contact with the insulated contact disc at the aft end of the fins. This shorts out the igniter firing circuit to prevent accidental firing of the motor. If Mk 16 and Mk 71 motors aren’t shipped and stowed in a launcher, they are shipped and stowed in individual, padded, wooden crates. Fin protectors are not used. Until actually loaded into a launcher, a metal shielding band (fig. 2-6) is always in place over the ignition contact band. Figure 2-6.—Shielding band for 5.0-inch FFAR. 2-5







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