When is the amber EHYD PX LO annunciator illuminated?

The amber EHYD PX LO annunciator is designed to alert the pilot when hydraulic system pressure is insufficient for safe operation. The correct answer indicates that this warning light will illuminate when hydraulic pressure falls below 2400 psi, within a tolerance of +/- 150 psi.

This means that the warning will activate if the hydraulic pressure drops to levels between 2250 psi and 2550 psi. The hydraulic system pressure is crucial for the functionality of various flight control systems, landing gear operation, and other essential functions in the aircraft. By setting this threshold at 2400 psi, the system provides an early warning to the pilot that corrective action may be needed to ensure safe aircraft operation.

Understanding this threshold helps pilots recognize when they need to monitor hydraulic pressure closely and take necessary measures, such as performing a system check or preparing for potential emergency procedures, to ensure the aircraft's safety and operational integrity.