Mk 118 Mod 0 and Mod 1 Antitank BombletsThe antitank bomblets Mk 118 Mod 0 (fig. 1-32)consists of a Mk 1 Mod 0 fuzing system, ashaped-charge warhead, and fixed stabilizing fins. It isloaded in the Mk 20 Mod 3 bomb clusters only. In theantitank bomb Mk 118 Mod 1, the fuzing system is aMk 1 Mod 1, and the bombs are loaded in the Mk 20Mod 6 bomb clusters only.FUNCTIONAL DESCRIPTIONWhen the Mk 20 bomb cluster is released from theaircraft, the arming wires (primary and/or optionalarming) are pulled sufficiently to arm the Mk 339 fuzeand release the fins. The positive armed fin releasearming wire frees the fin release band, and the movablefins snap open by spring-force.Functioning of the fuze initiates the linear-shapedcharges in the dispenser; that cut the dispenser case inhalf, and disperses the bombs/bomblets. When the Mk339 Mod 1 primary fuze arming wire is pulled, the fuzewill function 1.2 seconds after the arming wire has beenextracted. If the pilot selects the option time (4.0seconds), both the primary and option arming wiresmust be pulled. If the pilot selects the option time andthe primary arming wire is not pulled, the fuze will be adud.Mk 118 Mods 0 and 1 Antitank BombWhen the Mk 118 bomb separates from thedispenser case, the base fuze-arming vane rotates andthe fuze is armed. If the bomb strikes a hard target, suchas concrete or armor, the electric detonator ignites theshaped-charge warhead immediately. If the bombstrikes a soft target, such as earth or sandbag, the bombpenetrates the targets until deceleration lets the inertiafiring pin strike and initiate the stab detonator, causingwarhead denotation.SHIPPING AND STORAGE CONTAINERSThe Mk 427 Mod 0 and Mod 1 shipping andstorage containers encase one fully assembled Mk 20bomb cluster. The reusable containers consist of metalupper and lower shell assemblies that are secured witheither 16 quick-release latches (Mod 0) or 18 "T"latches (Mod 1). A rubber gasket provides anenvironmental seal when the upper and lower shells aremated. External frame members are welded to each halfof the container so the containers can be stacked sixhighandprovidethenecessaryfittingsforground-handling equipment.The reusable weapon cradle Mk 18 Mod 0 is usedto ship and store two fully assembled Mk 20 bombclusters. The cradle consists of plastic upper and lowershell assemblies, which are shock-mounted on a metalcradle assembly. The weapon cradle has forklift guides,lifting eyes; hand truck brackets, and lifts devices topermit the use of handling equipment. Four supportsare provided on each cradle to aid in stacking the cradleassemblies.REVIEW NUMBER 8Q1. Name the main structure of the Mk 7 bombdispenser.Q2. The Mk 20 bomb cluster weighs ______ andcontains ____ bomblets.Q3.Name the component used to stabilize thebomb after release from the aircraft.Q4.Describe the purpose of the Mk 339 Mod 1mechanical time fuze.Q5.List the components of the Mk 118 Mod 0 andMod 1 antitank bomblets.Q6.What shipping container is used to ship andstore the Mk 20 bomb cluster?CBU-78/B and B/B GATORThe CBU-78/B and B/B GATOR weapon isdelivered as an all-up-round (AUR) (fig. 1-33). Theweapon consists of the SUU-58/B dispenser, Mk 3391-36Figure 1-32.—Antitank bomblets Mk 118 Mod 0 and Mod 1.
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