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Bridle Tensioner Limit Switches
FUSES AND CIRCUIT BREAKERS - 14001_186

Aviation Boatswains Mate E 3 & 2 - Aviation theories and other practices
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Figure 4-59.—Weight confirmation unit. recommended that the unit be operated during the day without batteries installed to reduce the weight of the unit and extend battery life. For night operations, four size D batteries are installed. The ON/OFF switch controls an electroluminescent lamp at the front or the back of the unit. The back of the unit is equipped with a panel, on which the operator can write with a grease pencil. The unit is held by the operator at waist level on an adjustable neck strap. The operator sets the particular aircraft weight to appear on the front of the unit, and then flashes the weight to the pilot in the aircraft and to the catapult officer. CATAPULT CONTROL SYSTEMS The control system of a steam catapult controls all phases of catapult operation. The operation of the control system is primarily divided between the main control console and the deckedge control panel on the C-7/C-11 and C-13 catapults. On the C-13-1 and C-13-2 catapults, the controls are centrally located in the ICCS. Electrical Control System Components The electrical control system for a steam catapult consists of a control console and various control panels that govern the operation of the catapult in conjunction with control components of other systems. Included among the components of the catapult electrical control system are various push buttons, switches, solenoids, relays, circuit breakers, fuses, and lights. The control console is the focal point of all functions of the catapult electrical control systems. Electrically operated solenoid valves produce mechanical operation of valves throughout the catapult. Some solenoid valves are actuated by buttons, while others function automatically during catapult operation. Various changes that occur during catapult operation are sensed by limit switches and pressure switches. Operation of these switches actuates lights at various control panels.    The following paragraphs briefly describe some of these components. For information on the function and interrelationship of the electrical components in a specific system, study the schematic diagrams in the technical manual for that particular type of catapult. SOLENOIDS.—A solenoid is an electromagnet formed by a conductor wound in a series of loops in the shape of a helix (spiral). Inserted within this spiral or coil are a soft-iron core and a movable plunger. The soft-iron core is pinned or held in position and therefore is not movable. This movable plunger (also soft iron) is held away from the core by a spring in the de-energized position. See figure 4-60. When current flows through the conductor, a magnetic field is produced. This field acts in every respect like a permanent magnet having both a north and south pole. As shown in figure 4-60, the de-energized position of the plunger is partially out of the coil, because of the action of the spring. When voltage is applied, the 4-47







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