Which of the following engine oil pressures indicates a cautionary condition with low N1?

• A. 30 to 50 psi
• B. 40 to 60 psi
• C. 40 to 80 psi
• D. 60 to 80 psi

Answer: (C)

The engine oil pressure that indicates a cautionary condition with low N1 is accurately represented by the range of 40 to 80 psi. This range suggests that, while the oil pressure might be acceptable, a correlation with low N1 reflects a potential issue that could affect engine performance.

In aviation, engine performance indicators like N1, which is the rotational speed of the lowest-pressure compressor, are critical for understanding the engine's operational state. Low N1 paired with oil pressure readings falling within this range suggests that the engine may not be functioning optimally. Maintaining awareness of these parameters is essential for effective flight operations and safety. Monitoring oil pressure is crucial because it ensures proper lubrication of engine components; deviations in N1 coupled with the engine oil pressure in the caution range emphasize the need for immediate attention to avoid potential engine issues.

The other options do not accurately reflect the cautionary condition associated with low N1 and would thus not be indicative of a situation requiring immediate remediation by the pilot. Understanding this relationship between engine parameters highlights the importance of vigilant monitoring during flight operations to maintain safety and performance standards.