ABE Aircraft Launch and Recovery Equipment Maintenance Program (ALREMP) Test 1 Practice

Repeated high-temperature operation pushes hydraulic fluid beyond its stability range. Fluid mixtures are designed to resist oxidation and maintain a lubricating film under normal temps, but heat accelerates chemical reactions that break down additives and oxidize the oil. This creates varnish, sludge, and degraded lubrication, which can clog passages, clog filters, and raise internal resistance. With additives depleted, wear protection and corrosion inhibitors diminish, so pumps, valves, and actuators experience more wear and a higher risk of leaks. Seals and hoses are especially vulnerable to heat, potentially swelling, softening, or hardening, which adds leaks and pressure issues. The result is reduced lubricating effectiveness, higher energy losses, and faster component wear, shortening the system’s life. That’s why repeated high-temperature operation can degrade the fluid and reduce efficiency and life of components.