MEAMECO026A Hydraulic Systems in Aircraft

What are hydraulic systems used for in aircraft?

• Transmitting energy or signals through static or dynamic forces of liquids

• Generating electrical power for the aircraft systems

• Providing heating and cooling within the aircraft cabin

• Enhancing the aerodynamic shape of the aircraft

Which of the following is NOT an operation on aircraft that uses hydraulic power systems?

• Landing gear operation

• Flap adjustment

• Flight control surfaces movement

• Fuel measurement

Which of the following is NOT an advantage of using hydraulic power?

• Light weight

• Ease of installation

• High maintenance requirements

• Simplification of inspection

True or False: Hydraulic operations are almost 100% efficient, with only negligible efficiency loss due to fluid friction.

• True

• False

True or False: The height of the column has no effect on pressure in a hydraulic system.

• True

• False

True or False: Micronic filters prevent the passage of anything greater than 1 micron in hydraulic systems.

• True

• False

What is the flash point of a hydraulic fluid?

• The temperature at which a fluid gives off vapour in sufficient quantity to ignite when a flame is applied

• The fluid's ability to resist deterioration for long periods

• The fluid's internal resistance to flow

• The temperature at which a fluid gives off vapour in sufficient quantity to ignite and continue to burn when exposed to a spark or flame

What is the fire point of a hydraulic fluid?

• The temperature at which a fluid gives off vapour in sufficient quantity to ignite when a flame is applied

• The fluid's ability to resist deterioration for long periods

• The fluid's internal resistance to flow

• The temperature at which a fluid gives off vapour in sufficient quantity to ignite and continue to burn when exposed to a spark or flame

What are the 3 main categories of Hydraulic fluid?

• Mineral based, Polyalphaolefins based, Phosphate Ester based

• Synthetic based, Natural based, Water based

• Silicone based, Glycol based, Petroleum based

• Biodegradable based, Non-flammable based, Water-Glycol based

Which hydraulic fluid is the oldest, dating back to the 1940s?

• Polyalphaolefin Based Hydraulic Fluid

• Mineral Based Hydraulic Fluid

• Phosphate Ester Based Hydraulic Fluid (Skydrol®)

• Silicone Based Hydraulic Fluid