AM.III.D.K11

From the FAA library

• Aviation Maintenance Technician Handbook - Powerplantp. 10-21
  Chapter 10: Engine Maintenance & Operation › Installation & Testing › Engine Instruments

  condition exists. A red arc indicates a dangerous operating range due generally to an engine propeller vibration range. This arc can be passed through, but the engine cannot be operated in this area. Of the two, the red mark ... instrument cover glass or dial face. The green arc shows a normal and safe range of operation. When the markings appear on the cover glass, a white line is used as an index mark, often called a slippage mark…

• Helicopter Flying Handbookp. 5-3
  Chapter 5: Rotorcraft Flight Manual › Operating Limitations (Section 2) › Powerplant Limitations

  maximum power range is depicted by a yellow arc on the engine power instruments, with a red line indicating the maximum power that must not be exceeded. “Maximum continuous power” is the maximum power the engine can generate continually ... Figure 5-4] Figure 5-3. Markings on a typical dual-needle tachometer in a reciprocating-engine helicopter. The outer band shows the limits of the superimposed needles when the engine is turning the rotor. The inner band indicates…

• Aviation Maintenance Technician Handbook - Powerplantp. 6-8
  Chapter 6: Lubrication & Cooling Systems › Reciprocating Engine Lubrication Systems › Oil Pressure Gauge

  indicator contains two Bourdon tubes, housed in a standard instrument case; one tube being used for each engine. The connections extend from the back of the case to each engine. There is one common movement assembly, but the moving ... light oil in the line to the transmitter; during cold weather, the thicker mixture causes sluggish instrument readings. To correct this condition, the gauge line must be disconnected, drained, and refilled with light oil. Figure 6-10. Oil pressure…