Mk 118 Mods 0 and 1 Antitank Bomb

Mk 118 Mod 0 and Mod 1 Antitank Bomblets The antitank bomblets Mk 118 Mod 0 (fig. 1-32) consists of a Mk 1 Mod 0 fuzing system, a shaped-charge warhead, and fixed stabilizing fins. It is loaded in the Mk 20 Mod 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 Mod 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 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. Functioning of the fuze initiates the linear-shaped charges in the dispenser; that cut the dispenser case in half, and disperses the bombs/bomblets. When the Mk 339 Mod 1 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. SHIPPING AND STORAGE CONTAINERS The Mk 427 Mod 0 and Mod 1 shipping and storage containers encase one fully assembled Mk 20 bomb cluster. The reusable containers consist of metal upper and lower shell assemblies that are secured with either 16 quick-release latches (Mod 0) or 18 "T" latches (Mod 1). A rubber gasket provides an environmental seal when the upper and lower shells are mated. External frame members are welded to each half of the container so the containers can be stacked six high and provide the necessary fittings for ground-handling equipment. The reusable weapon cradle Mk 18 Mod 0 is used to ship and store two fully assembled Mk 20 bomb clusters. The cradle consists of plastic upper and lower shell assemblies, which are shock-mounted on a metal cradle assembly. The weapon cradle has forklift guides, lifting eyes; hand truck brackets, and lifts devices to permit the use of handling equipment. Four supports are provided on each cradle to aid in stacking the cradle assemblies. REVIEW NUMBER 8 Q1. Name the main structure of the Mk 7 bomb dispenser. Q2. The Mk 20 bomb cluster weighs ______ and contains ____ bomblets. Q3. Name the component used to stabilize the bomb after release from the aircraft. Q4. Describe the purpose of the Mk 339 Mod 1 mechanical time fuze. Q5. List the components of the Mk 118 Mod 0 and Mod 1 antitank bomblets. Q6. What shipping container is used to ship and store the Mk 20 bomb cluster? CBU-78/B and B/B GATOR The CBU-78/B and B/B GATOR weapon is delivered as an all-up-round (AUR) (fig. 1-33). The weapon consists of the SUU-58/B dispenser, Mk 339 1-36 Figure 1-32.—Antitank bomblets Mk 118 Mod 0 and Mod 1.