ASSIGNMENT 9 Textbook Assignment: “Basic Actuating Systems,”   chapter 8, pages 8-1 through 8-23. 9-1. 9-2. 9-3. 9-4. 9-5. 9-6. What unit transforms hydraulic fluid pressure into mechanical force, which performs work by moving some mechanism? An actuating unit A cylinder unit A control unit A power unit Naval aircraft use which of the following types of actuating units? 1. Linkage units 2. Hydraulic motors only 3. Actuating cylinders only 4. Hydraulic motors and actuating cylinders Aircraft actuating cylinders are used when which of the following mechanism movements are required? 1. Bilateral motion 2. Linear motion only 3. Reciprocating motion only 4. Linear or reciprocating motion What is the most common type of actuating cylinder used on naval aircraft? 1. Balanced 2. Cushioned 3. Unbalanced 4. Dual hydropneumatic If hydraulic pressure is used to move a single-acting actuating cylinder in only one direction, all EXCEPT which of the following forces may be used to move it in the opposite direction? Gravity Fluid bypass Spring tension Nitrogen pressure The operation of a single-acting, spring-loaded, piston-type actuating cylinder is normally controlled by what component? A directional control valve A limiting switch A priority valve A sequence valve 9-7. 9-8. 9-9. In reference to a double-acting, piston-type actuating cylinder, which of the following statements is 1. 2. 3. 4. An correct? There are two pressure and two return ports The cylinder contains two pistons and one rod Fluid pressure can be applied to either side of the piston The stroke of the piston rod travels in one direction only unbalanced, double-acting, piston-type actuating cylinder uses a directional control valve capable of directing fluid in what total number of ways? One Two Three Four To prevent internal leakage from one-side of the piston to the other, double-acting, piston-type actuating cylinders are equipped with which of the following items? 1. Backup rings only 2. Backup rings and O-rings only 3. Backup rings, O-rings, and metal scrapers only 4. Backup rings, O-rings, metal scrapers, and felt wipers IN ANSWERING QUESTION 9-10, REFER TO FIGURE 8-3 IN THE TEXTBOOK. 9-10. When the cylinder is in the down and locked position, the locking ball bearings are held in the locking position by what means? 1. Hydraulic pressure 2. A ball-lock plunger 3. Detent springs 4. A piston shaft 9-11. To equalize the displacement of fluid on either side of the piston, a double-action, finger-lock actuator incorporates what component? 1. A piston spring 2. A balance shaft 3. An inner cylinder 4. An integral spring-loaded mechanical lock 43