What is the tachometer maximum limit at 4000 feet for the Cessna 152?

The maximum tachometer limit for the Cessna 152 at 4000 feet is indeed 2550 RPM. This limit is crucial for operating the engine within its designed performance parameters and ensuring engine longevity. Operating consistently above the maximum RPM can lead to excessive wear or even failure of engine components. The specified limit considers the effects of altitude on engine performance; as you ascend, the air density decreases, which can affect engine power output and efficiency.

Understanding these limits is essential for safe and effective flight operations, ensuring the pilot maintains control and performance of the aircraft under varying conditions.