AM.III.D.K3
KnowledgeEngine speed indicating systems.
From the FAA library
- Chapter 10: Aircraft Systems › Mechanical Movement Indicators › Accelerometers
Should the speed of the other engine then become greater than that of the first engine, the signal from its tach generator causes the synchroscope motor to reverse itself and turn in the opposite direction. The pilot makes adjustments ... involve designating one of the engines as a master engine. The rpm of the other engine(s) is always compared to the rpm of this master engine. The dial face of the synchroscope indicator looks like Figure 10-59. “Slow…
- Chapter 10: Aircraft Systems › Mechanical Movement Indicators › Tachometers
condition of the aircraft in flight. Tachometers The tachometer, or tach, is an instrument that indicates the speed of the crankshaft of a reciprocating engine. It can be a direct- or remote-indicating instrument, the dial of which is calibrated ... percent corresponding to optimum turbine speed. This allows similar operating procedures despite the varied actual engine rpm of different engines. [Figure 10-52] In addition to the engine tachometer, helicopters use a tachometer to indicator main rotor shaft…
- Chapter 10: Aircraft Systems › Maintenance of Instruments & Instrument Systems › Tachometer Maintenance
engine speed is increased, the motor should synchronize and register the rpm correctly. The rpm at which synchronization occurs varies with the design of the tachometer system. If the instrument pointer(s) oscillate(s) at speeds above the synchronizing value ... determine that the total oscillation does not exceed the allowable tolerance. Pointer oscillation can also occur with a mechanical indication system if the flexible drive is permitted to whip. The drive shaft should be secured at frequent intervals to prevent…