What is a "pressure test" used for in aircraft maintenance?

A "pressure test" is primarily used in aircraft maintenance to identify leaks in fuel and hydraulic systems. This process involves applying pressure to the systems and monitoring for any drops in pressure or visible signs of leaks. Fuel and hydraulic systems are critical for the safe operation of an aircraft, as any leaks could lead to system failures, loss of control, or fire hazards.

Conducting a pressure test allows maintenance personnel to ensure that these systems are sealed properly and functioning as intended. Proper maintenance and early detection of leaks can significantly enhance the reliability and safety of the aircraft.

While testing structural integrity is a crucial aspect of aircraft maintenance, it generally employs different methods such as visual inspections, ultrasonic testing, or other specialized techniques rather than simply applying pressure. Similarly, measuring engine thrust involves specific methodologies like using thrust stands or other engine performance testing tools, and checking electrical circuits would typically involve multimeters or similar devices rather than a pressure test.