Engine Start – Min Oil Press?

Engine Start – Min Oil Press?

• A. 15psi
• B. 20psi
• C. 25psi
• D. 30psi

Answer: (C)

During engine start, oil pressure must rise quickly to ensure proper lubrication of all moving parts as the engine spools up. There is a defined minimum oil pressure that must be reached during the start sequence to consider the start valid. For the ERJ 175’s engine, that minimum is 25 psi. If oil pressure does not reach at least this value within the start window, lubrication is insufficient and continuing the start could risk engine damage, so the start should be aborted or the fault investigated. That’s why 25 psi is the best answer: it represents the required minimum threshold to approve the start. Values below it (such as 15 psi or 20 psi) do not meet the standard and indicate a failure to achieve adequate lubrication. A higher reading (like 30 psi) could occur during start or once running, but it isn’t the minimum required to declare a successful start.

During engine start, oil pressure must rise quickly to ensure proper lubrication of all moving parts as the engine spools up. There is a defined minimum oil pressure that must be reached during the start sequence to consider the start valid. For the ERJ 175’s engine, that minimum is 25 psi. If oil pressure does not reach at least this value within the start window, lubrication is insufficient and continuing the start could risk engine damage, so the start should be aborted or the fault investigated.

That’s why 25 psi is the best answer: it represents the required minimum threshold to approve the start. Values below it (such as 15 psi or 20 psi) do not meet the standard and indicate a failure to achieve adequate lubrication. A higher reading (like 30 psi) could occur during start or once running, but it isn’t the minimum required to declare a successful start.