AM.III.D.S7

From the FAA library

• Aviation Maintenance Technician Handbook - Airframep. 10-29
  Chapter 10: Aircraft Systems › Tachometers › Electric Tachometers

  motion of the pointer across the scale on the instrument face. [Figure 10-54] Figure 10-52. A tachometer for a reciprocating engine is calibrated in rpm. A tachometer for a turbine engine is calculated in percent of rpm. Figure ... simplified mechanism of a flyweight type mechanical tachometer. Electric Tachometers It is not practical to use a mechanical linkage between the engine and the rpm indicator on aircraft with engines not mounted in the fuselage just forward of the instrument…

• Aviation Maintenance Technician Handbook - Airframep. 10-79
  Chapter 10: Aircraft Systems › Instrument Installations & Markings › Instrument Range Markings

  Instrument Range Markings Many instruments contain colored markings on the dial face to indicate, at a glance, whether a particular system or component is within a range of operation that is safe and desirable or if an undesirable condition exists ... These markings are put on the instrument by the original equipment manufacturer in accordance with the Aircraft Specifications in the Type Certificate Data Sheet. Data describing these limitations can also sometimes be found in the aircraft manufacturer’s operating…

• Aviation Maintenance Technician Handbook - Powerplantp. 4-26
  Chapter 4: Engine Ignition & Electrical Systems › Magneto-Ignition Timing Devices › Built-In Engine Timing Reference Marks

  center (TC) mark stamped on the edge aligns with the crankcase split line below the crankshaft when the No. 1 piston is at top dead center. Other flange marks indicate degrees before top center. Some engines have degree markings ... engines, the plug provided on the exterior of the reduction gear housing must be removed to view the timing marks. On other engines, the timing marks are on a crankshaft flange and can be viewed by removing a plug from…