Cessna 172 PIM states that normal engine speed operating limit changes with altitude: 2500 rpm for sea level to 5000 ft in standard conditions, 2600 rpm for 5000 ft to 10,000 ft, and 2700 rpm for above 10,000 ft. Why? Is it due to the increased density preventing the propeller from spinning up to 2700 rpm at low altitudes?
Engine is rated at 180 HP at 2700 rpm. Does that mean I'm not producing max power any time I'm below 10,000 ft?
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