Above 60% N2, the normal engine oil pressure is within which PSIG range?

Above 60% N2, the normal engine oil pressure is within which PSIG range?

• A. 40-60 PSIG
• B. 60-83 PSIG
• C. 70-90 PSIG
• D. 20-40 PSIG

Answer: (B)

Oil pressure in a turbine engine rises with engine speed because the oil pump delivers more flow as RPM increases. When N2 is above 60%, the engine is in a higher-power regime, and the lubrication system maintains pressure in the mid to upper range. The normal oil pressure for this condition is 60 to 83 PSIG. Lower pressures (like 20–60 or 40–60) are typical at idle or lighter power, while pressures well above the normal range (around 70–90, especially near 90) would be outside the expected window and could indicate a relief-valve or system issue. So, 60–83 PSIG best reflects the normal range above 60% N2.

Oil pressure in a turbine engine rises with engine speed because the oil pump delivers more flow as RPM increases. When N2 is above 60%, the engine is in a higher-power regime, and the lubrication system maintains pressure in the mid to upper range. The normal oil pressure for this condition is 60 to 83 PSIG. Lower pressures (like 20–60 or 40–60) are typical at idle or lighter power, while pressures well above the normal range (around 70–90, especially near 90) would be outside the expected window and could indicate a relief-valve or system issue. So, 60–83 PSIG best reflects the normal range above 60% N2.