What value is the maximum oil pressure limited to when the oil temperature transient is less than 60C?

What value is the maximum oil pressure limited to when the oil temperature transient is less than 60C?

• A. 156 PSI
• B. 140 PSI
• C. 170 PSI
• D. 180 PSI

Answer: (A)

Oil pressure is controlled by a relief valve that adjusts with oil temperature. When the oil is cold, its higher viscosity makes it harder for the pump to push it, so the system sets a lower maximum pressure to protect bearings and seals during startup. For the CRJ-550, the cold condition (oil temperature transient below 60 C) is limited to 156 psi. This value provides enough lubrication while preventing overpressure until the oil warms. The other numbers don’t match this cold-oil limit, and would not be appropriate under those conditions.

Oil pressure is controlled by a relief valve that adjusts with oil temperature. When the oil is cold, its higher viscosity makes it harder for the pump to push it, so the system sets a lower maximum pressure to protect bearings and seals during startup. For the CRJ-550, the cold condition (oil temperature transient below 60 C) is limited to 156 psi. This value provides enough lubrication while preventing overpressure until the oil warms. The other numbers don’t match this cold-oil limit, and would not be appropriate under those conditions.