11.11 Hydraulic Fluids Flashcards
Good properties for hydraulic fluid
Low flammability, corrosion resistance, good lubricator, resistant to freezing, non evaporating, non foaming
What hydraulic fluid is most used for commercial aircraft
Phosphate ester based fluid (skydrol)
Why should hydraulic fluid be free from contamination
Can cause issues in system, clog filter and damage components
What are the two methods of servicing hydraulic systems
Reservoir filling and fluid sampling
What are the two types of reservoir filling
Pressurised and manual
What is pressurised filling
Takes place at the service panel, ground equipment attached to fill connector, fluid passes through restrict or to prevent system overpressure
What is manual filling
Using hand pump instead of ground equipment, fluid sucked from container through check valve into
How often should hydraulic fluid be sampled
Once every year or every 3000 flight hours
How is hydraulic leak detected
Detected by a leak measurement solenoid valve
How is hydraulic leak detected
Detected by a leak measurement solenoid valve
