"Robert M. Gary" wrote:
Can your 152 produce 75% power at 3000 feet?

I don't have real-world numbers to back this up, but doing some
interpolation from the cruise numbers in the POH: 75% power is possible at
2425 RPM at 3000 feet with a TAS of 102. In a climb I would be at around 70
knots, so the engine should not be able to reach the cruise RPM of 2425. So
I suppose in a climb at 3000 feet, the engine would not be producing 75%,
and it would be OK to lean.