During ground start, is an oil pressure reading of 170 psi within the limit?

• A. Yes
• B. No
• C. Only with engine warm-up
• D. Not determinable

Answer: (A)

During ground start, oil pressure can rise quickly as the engine spins with cold oil and the pump is delivering flow. What matters is whether that reading stays below the engine’s published maximum for starting. If 170 psi is below the specified maximum in the maintenance data or flight manual, it is considered within the limit. The exact figure varies by engine model, but the principle is that there is a defined ceiling, and readings under that ceiling during start are acceptable. After the engine starts and oil warms, the pressure should settle into the normal operating range.