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Aero 7B-4 Bomb Ejector Rack - 14024_274
Ejector Mechanism Cleaning and Inspection

Aviation Ordinanceman 1 - Aviation theories and other practices
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Figure 10-14.—Aero 7B-4 bomb ejector rack. Principles of Operation Operation of the bomb ejector rack is initiated when 28-volt dc is applied to the two impulse cartridges installed in the dual breech assembly. The two impulse cartridges are fired simultaneously, creating gas pressure in the breech. Gas pressure buildup causes the breech and sleeve assembly, through the mechanical linkage, to raise the hook sears, which opens the suspension hooks. At the same time, gas pressure is applied to the piston assembly to drive the ejector foot downward and eject the store from the bomb ejector rack. After ejection, a spring in the sleeve assembly returns the ejector foot to the sleeve housing. Emergency operation of the rack is identical to normal operation, except that completely separate electrical wiring is used for each impulse cartridge to ensure detonation of the two impulse cartridges. Mechanical arming is done through the electromechanical arming solenoids. It works in the same manner as the Aero 65A series bomb racks. When an armed drop is to be made by using electric fuzing, an electrical signal is applied to the Mk 39 electric fuze arming connector. When the hooks open, this signal is transmitted to the Mk 122 Mod 0 safety arming switch, which arms the weapon as it clears the rack suspension hooks. You don’t want the bomb ejector rack to fire during ground operations. To prevent firing, insert a safety pin into the safety switch assembly. The safety pin maintains an open firing circuit, grounds the breech cap assembly electrical circuit, and mechanically blocks the linkage to prevent the suspension hooks from opening manually. If the suspension hooks are opened manually, remove the safety pin. If you rotate the manual release nut with the safety pin installed, you will damage the linkage and possibly shear a sear retainer pin. Once the hooks are manually opened, you can reinstall the safety pin to load weapons or stores. Maintenance Requirements Organizational-level maintenance for the Aero 7A-5 and the Aero 7B-4 bomb ejector racks is normally performed while the bomb ejector racks are installed on the aircraft. The exception is the 21-day special inspection. In this case, the bomb ejector rack is removed from the aircraft. The bomb ejector racks are also removed from the aircraft and routed to an intermediate-level maintenance activity every 420 days for rework. They are removed from the aircraft every 42 months and routed to a depot-level maintenance activity for overhaul. Normally, routine maintenance at the organizational level is performed during regularly scheduled servicing 10-11







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