Enginesengine instruments
Tachometer
A tachometer is a primary engine instrument that indicates the rotational speed of the engine's crankshaft in revolutions per minute (RPM). In an aeroplane fitted with a fixed-pitch propeller, the tachometer is the main indicator of power output and is used to detect gradual power loss, such as that caused by engine icing.
Key Points
- •The tachometer measures engine speed in RPM.
- •It is used to monitor power output in fixed-pitch propeller aeroplanes.
- •A drop in RPM is the first indication of carburettor ice in a fixed-pitch aircraft.
Exam Relevance
Essential for identifying power loss in fixed-pitch propeller aircraft and confirming correct engine operation during run-up checks.
Related Terms
Learn More
Dive deeper into engines with our comprehensive study guide.
Engines Study Guide →Practice Engines Questions
Test your understanding with exam-style questions.