If oil pressure remains between which values at idle power for more than 5 seconds, both amber and red OIL PX annunciators will illuminate?

In aviation, maintaining proper oil pressure is critical for engine performance and safety. The correct range of oil pressure at idle power, specifically between 15 and 40 psi, is established to ensure that the engine lubrication system is functioning adequately. If the oil pressure falls below 15 psi for more than 5 seconds, it indicates a serious issue, potentially leading to engine damage; hence, the red OIL PX annunciator illuminates as a critical warning. Similarly, if the oil pressure is consistently above 40 psi, while not immediately critical, it can still necessitate attention, as it may signify over-pressurization or other malfunctions within the system.

In this context, both the amber and red annunciators activating serve as crucial safety measures to alert the pilot to conditions that may compromise engine function. The red warning indicates a severe problem, while the amber light serves as a caution to monitor the situation closely. Therefore, the correct answer encompasses those specific thresholds (15 to 40 psi) that trigger these warnings and reflects the operational limits required for safe engine operation.