The Mk 26 GMLS fin opener assembly (fig. 7-24) is mounted to the magazine deck at the hoist station. It is somewhat physically comparable to other fin opener arm assemblies. During a load cycle, the entire assembly shifts laterally between two positions, AAW or ASW, if required. This action aligns the fin cranks to the fins on the different diameter missiles. Once in proper position, the assembly then raises to engage the missile, unfolds the fins (of AAW and ASW rounds), and then lowers.

During an unload cycle of an ASW missile, the fin opener assembly raises, unlocks, and refolds the ASW fins. The fins of AAW missiles cannot be automatically refolded. System personnel must enter the magazine and manually close them.

Associated with the fin opener assembly is an AAW identification probe (fig. 7-25). It is located within the inlet of the plenum assembly at the hoist station. The probe is used to identify AAW missile groups before they are hoisted. When the tin opener assembly shifts to the AAW position, an actuator plate on the left-hand opener engages a linkage rod attached to the probe. As the assembly raises (or lowers), the probe also raises (or lowers) to engage (or exit) the aft receptacle of the missile.

Magazine Hydraulic Systems

Within each RSR's six-missile section and hoist end section are the components that produce the necessary hydraulic forces to operate the system during normal

Figure 7-25.-AAW identification probe.

and emergency conditions. The principal hydraulic systems are the RSR/hoist main accumulator and power drive system and the exercise and emergency accumulator system.

RSR/HOIST SYSTEM.- Sharing a common electric motor, the RSR/hoist main accumulator system and the RSR/hoist power drive function during all normal GMLS operations. The main accumulator system supplies various hydraulic fluid pressures to operate components of the loading system, the strikedown system, the jettison devices, and the RSR/hoist power drive.

The RSR/hoist power drive (fig. 7-26) provides the hydraulic power and control needed to index the hanger rails and to raise/lower the hoist chain and pawl. A hydraulically operated shifter mechanism transfers the output of the hydraulic transmission to either the RSR speed reducer and drive sprocket or to the hoist speed reducer and drive sprocket. The individual drive trains for the RSR and hoist are shown in figure 7-26.

EXERCISE AND EMERGENCY AC-CUMULATOR SYSTEM.- Each RSR contains an exercise and emergency accumulator system. It is used in the event of normal electrical power failure or for

Figure 7-26.-RSR/hoist power drive.

exercise/maintenance purposes. This system is hydraulically part of the RSR/hoist main accumulator system. However, it uses a smaller electric motor and pump to deliver a reduced hydraulic fluid pressure to the magazine components and the train power drive.

LAUNCHER

The launcher consists of all the components necessary to receive missiles from the magazine and prepare them for launching. A rectangular plate about 18 feet long and 10 feet wide, called the platform, supports the carriage and two dud-jettison devices. It also provides mounting surfaces for the blast doors, span rails, and some train drive components.

The carriage supports the guide arms and consists of various components, as shown in figure 7-27. The stand is secured to the platform and serves as a stationary support structure. The base ring fits inside the stand and rotates on two sets of bearings. Ball bearings near the top of the stand support the weight of the rotating launcher. Roller bearings near the bottom of the stand hold the base ring in vertical alignment.

The trunnion support is a boxlike structure mounted to the top of the base ring. It supports the trunnion tube on ball- and roller-bearing assemblies. It also houses the elevation drive and other hydraulic components.

The electrical contact ring is located within the base ring area. It transmits electrical power and anti-icing fluid between the stationary and rotating parts of the launcher.