What value stands on the first red line of the oil pressure indicator?

What value stands on the first red line of the oil pressure indicator?

• A. 50 psi
• B. 25 psi
• C. 75 psi
• D. 100 psi

Answer: (B)

Oil pressure is a measure of lubrication for the engine, and the gauge uses colored bands to show safe ranges. The lowest red mark on this gauge is the minimum acceptable oil pressure in flight. For a Cessna 152, that first red line sits at 25 psi. If the needle enters that red area, oil pressure is too low, risking insufficient lubrication and potential engine damage. Normal operation sits well above that threshold, varying with RPM and oil temperature, but typically staying out of the red zone. If you see the needle at or below 25 psi, reduce power and land as soon as practical to check oil level and investigate the cause.

Oil pressure is a measure of lubrication for the engine, and the gauge uses colored bands to show safe ranges. The lowest red mark on this gauge is the minimum acceptable oil pressure in flight. For a Cessna 152, that first red line sits at 25 psi. If the needle enters that red area, oil pressure is too low, risking insufficient lubrication and potential engine damage. Normal operation sits well above that threshold, varying with RPM and oil temperature, but typically staying out of the red zone. If you see the needle at or below 25 psi, reduce power and land as soon as practical to check oil level and investigate the cause.