What method extends the nose landing gear when there is a loss of hydraulic pressure?

The method used to extend the nose landing gear when there is a loss of hydraulic pressure is auxiliary hydraulic pressure. This system is designed to provide an alternative source of hydraulic pressure in the event of a primary system failure. It ensures that critical systems, such as landing gear, can still function safely even when the normal hydraulic system is not operational.

The auxiliary hydraulic system usually operates independently and is pressurized separately, allowing for essential components to be extended or retracted. In the case of a loss of hydraulic pressure, the use of auxiliary hydraulic pressure ensures that the landing gear can be deployed, which is crucial for a safe landing.

The other options, while they may touch on methods of gear extension, do not specifically represent the auxiliary system designed for emergencies, making it the most reliable choice in this situation.