Loading/Downloading Transporter

Ammunition primers are exposed when you conduct transporter loading/downloading operations. Therefore, loading/downloading must be done in a RADHAZ safe area.

As you read this section, refer to figure 7-11. When you are loading the transporter, attach the timed drum loader assembly to the timed drum entrance cover of the transporter, and attach the timed drum unload assembly to the timed drum exit cover. If you are simultaneously loading/downloading, attach both the timed drum loader assembly and drum unload assembly to the timed drum entrance cover and to the timed drum exit cover. When downloading only, the transporter is driven by a handcrank in the retainer at the center of the entrance end of the transporter. When loading or simultaneously loading/downloading, the transporter is driven by the load unit assembly.

Ammunition is placed in the load tray of the drum loader at the specified ratio. The curve and tilt of the tray lets the rounds roll freely toward the elements. As the load unit assembly is driven by the handcrank, each element picks up one round and carries it through the ammunition chute to the load unit assembly. As the rounds enter the ammunition chute, the rounds counter is actuated. The load unit assembly removes the rounds from the elements and places them in the retainer partitions of the drum entrance cover. The scoop disk assembly removes the rounds from the retainer partitions and places them into the drum partitions, where the inner drum (helix) moves them from the entrance cover toward the exit cover. Since there is a space in the outer drum where no controlling partitions exist, a cam on the outer drum engages a pin on the scoop disk assembly that closes the scoop extension. With the scoop extension closed, no rounds can be placed in the

Figure 7-11.-Loading and downloading transporter.

empty space. As the inner drum moves the rounds or spent cases toward the drum unload assembly, the scoop disk assembly removes the rounds from the drum partitions and places them into the retainer partitions of the drum exit cover.

The drum unload assembly removes the rounds from the retainer partitions and places them on the unload tray. A hole in the unload tray lets spent cases drop into a spent case container. Rounds are moved across the hole in the tray to a live-rounds container. These rounds must be restrained to prevent impact with the container or other rounds.

Loading/Downloading Aircraft Gun Systems

In a load and/or download operation, any combination of the following conditions may exist: A fully loaded, partially loaded, or empty transporter may be mated to a fully loaded, partially loaded, or empty gun system. Each set of possible combinations dictates a unique load and/or download operational sequence. The load or download operational sequence explained in the following paragraph refers to a fully loaded transporter mated to a fully loaded gun system.

For you to load or download an aircraft gun system, the conveyor system must be mounted on the transporter with the timed entrance and exit unit assemblies mounted to a timed drum. The timed interface unit assembly must be mated to the timed aircraft gun system by the aircraft adapter assembly. The rounds pass from the transporter, through the exit unit assembly, through an ammunition chute, to the interface unit assembly. When the interface unit assembly mode selector is in the bypass position

Figure 7-12.-Ammunition flow in bypass mode.

(fig. 7-12) and the system is cycled, the rounds are _{When you first connect or remove the interface unit} ^{guided around the element sprocket and into an} to or from the aircraft adapter, the interface unit ammunition chute, which returns them to the entrance assembly must be in the bypass position. When the ^{end of the transporter.} interface unit assembly mode selector is in the load position (fig. 7-13) and the system is cycled, the rounds are removed from the elements by a sprocket and guided into the elements in the aircraft adapter.

The rounds are carried from the aircraft adapter to the aircraft drum. The elements entering the aircraft adapter from the aircraft system contain spent cases or cleared rounds. These rounds are removed from the aircraft elements and are guided by a sprocket into the elements of the conveyor system for transfer to the transporter.