rear,  and  the  bombs/bomblets  spread  in  free-fall trajectories. To  stabilize  the  weapon  after  release  from  the aircraft, a tail cone assembly is attached to the aft end of the cargo section. The tail cone assembly houses four, spring-actuated folding fins. The fins are spring-loaded to the open position and secured in the closed position during ground handling by a fin release-band assembly. The fin release band is secured in the closed position by a safety cotter pin and by the fin release wire. The  explosive  content  of  the  weapon  is  indicated  by a yellow band around the forward end of the cargo section. The Mk 7 Mods 3,4, and 6 bomb dispensers differ from the Mk 7 Mod 2, but the physical appearance of the dispenser remains basically the same. The most significant change incorporated on Mod 3 and later Mods is the Mk 339 Mod 1 fuze, which provides the pilot with in-flight selection of the fuze function time. The Mk 7 Mod 4 bomb dispenser differs from the Mk 7 Mod 3 by modifying the dispenser and giving interface capabilities with a wider range of military aircraft. The Mk 7 Mod 6 bomb dispenser is the same as the Mk 7 Mod 3 except that the outside of the Mod 6 cargo section is coated with a thermal protective coating and has an additional yellow band around the forward end of the cargo section. The addition of the thermal coating increases the overall weight of the Mod 6 to 505 pounds. Mk 339 Mods 0 and 1 Mechanical Time Fuze The  purpose  of  the  Mk  339  Mods  0  and  1 mechanical time fuze is to initiate the linear-shaped charges located in the cargo section walls. Mk 118 Mod 0 and Mod 1 Antitank Bomb The  antitank  bomb  Mk  118  Mod  0  (fig.  1-39) consists   of   a   Mk   1   Mod   0   fuzing   system,   a shaped-charge warhead, and fixed stabilizing fins. It is loaded in the Mk 20 Mods 2 and 3 bomb clusters only. In the antitank bomb Mk 118 Mod 1, the fuzing system is a Mk 1 Mod 1, and the bombs are loaded in the Mk 20 Mods 4 and 6 bomb clusters only. FUNCTIONAL  DESCRIPTION When the Mk 20 bomb cluster is released from the aircraft, the arming wires (primary and/or optional arming) are pulled sufficiently to arm the Mk 339 fuze Figure 1-39.—Antitank bomb Mk 118 Mod 0 and Mod 1. and release the fins. The positive armed fin release arming wire frees the fin release band, and the movable fins snap open by spring-force. When the primary fuze arming wire is withdrawn from the Mk 339 Mod 0 fuze, the fuze will function after a 1.2-second (primary) or 4.0-second (option) delay, depending upon which setting was set in the fuze during weapon  preparation.  Functioning  of  the  fuze  initiates the linear-shaped charges in the dispenser; they cut the dispenser case in half, and disperse the bombs/bomblets. If the MK 339 Mod 1 fuze is used and only the primary fuze arming wire is pulled, the fuze will function 1.2 seconds after the arming wire has been extracted. If the pilot selects the option time (4.0 seconds), both the primary and option arming wires must be pulled. If the pilot selects the option time and the primary arming wire is not pulled, the fuze will be a dud. Mk 118 Mods 0 and 1 Antitank Bomb When  the  Mk  118  bomb  separates  from  the dispenser case, the base fuze arming vane rotates and the fuze is armed. If the bomb strikes a hard target, such as concrete or armor, the electric detonator ignites the shaped-charge  warhead  immediately.  If  the  bomb strikes a soft target, such as earth or sandbag, the bomb penetrates the targets until deceleration lets the inertia firing pin strike and initiate the stab detonator, causing warhead  denotation. 1-43