What does the Oil Pressure gauge read at idle according to the annunciator?

• A. 15-40
• B. 40-90
• C. 15-90
• D. 0-15

Answer: (A)

The Oil Pressure gauge reading at idle is specifically designed to provide critical information regarding the engine's lubrication system in terms of pressure. When the gauge indicates a reading between 15 and 40 psi, it reflects a safe operational range for oil pressure at idle. This range ensures that the engine components are receiving adequate lubrication to function properly without causing damage due to insufficient oil flow.

The other ranges proposed in the choices do not accurately reflect the safe oil pressure operating conditions at idle. A reading outside of the 15-40 psi range may indicate either low oil pressure, which could threaten engine integrity, or high oil pressure, which might suggest other underlying issues. Therefore, it is essential for operators to monitor the oil pressure gauge closely, especially at idle, to ensure engine health and performance.