What is considered a cautionary engine oil pressure range with N1 less than 72%?

• A. 30 to 50 psi
• B. 40 to 80 psi
• C. 50 to 70 psi
• D. 60 to 90 psi

Answer: (B)

The cautionary engine oil pressure range for the TH-73A when N1 is less than 72% is indeed 40 to 80 psi. This range is important for pilots to monitor, as oil pressure outside this specified range could indicate potential engine health issues or lubrication concerns that need to be addressed.

When N1 is operating below 72%, the oil system may require closer scrutiny since the engine may not be operating at optimal performance levels. Maintaining the oil pressure within this cautionary range ensures that the engine components are adequately lubricated, reducing friction and preventing overheating.

Understanding the significance of keeping oil pressure within specified ranges is critical for safe operation, and this specific range of 40 to 80 psi acts as a warning to pilots that they should be vigilant about engine performance and potential maintenance needs.