• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
Rigging pin set.
CABLE AND RIGID CONTROL SYSTEMS RIGGING

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
Page Navigation
  338    339    340    341    342  343  344    345    346    347    348  
brake-lever rod on the top of the instrument is moved to the closed position. This locks the pointer in place. Then, the lever assembly is released and the instrument removed from the cable with the pointer locked in position. After the reading has been noted, the brake-lever rod is moved to the open position, and the pointer will return to zero. The tensiometer, like any other measuring instru- ment, is a delicate piece of equipment and should be handled carefully.  Tensiometers should never be stored in a toolbox. Temperature changes must be considered in cable-type systems since this will affect cable tensions. When a temperature is encountered that is lower than that at which the aircraft was rigged, the cables become slack because the aircraft structure contracts more than the cables. When temperatures higher than that at which the aircraft was rigged are encountered, the aircraft structure expands more than the cables and tension is increased. The cables in any cable linkage system are rigged according to a temperature chart that is contained in the applicable maintenance instructions manual. This chart will give the proper tensions for the various temperature changes above and below the temperature at which the system was rigged. Rig Pins Rig pins are used in rigging control systems. Figure 9-24 shows a rigging pin kit used on one of the Navy’s aircraft. As you can see, rig pins may come in various sizes and shapes and may be designed for one or many installations. You should refer to the specific maintenance instructions manual for use and selection of rig pins. Throwboards Throwboards are special equipment used on specific aircraft for accurate measurement of control surface travel. See figure 9-25. Each throwboard has a protractor scale that indicates a range of travel in degrees. Zero degrees normally indicates the neutral position of the control surface. When the throwboard is mounted and the control column or stick is in neutral, the trailing edge of the control surface should be aligned to zero. As the control column or stick is moved to its extreme limits, you can read the corresponding degree indication on the throwboard. If the travel of the control surface is out of limits, you should adjust cables, push-pull rods, and control limit stops to obtain the correct control surface travel. When you are inspecting and rigging control surfaces, the specific maintenance instructions manual should be consulted. Figure 9-25.—Typical throwboard used for rigging rudder and rudder tab controls. 9-31







Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.