Utility Hydraulics Flashcards
What is the purpose of the utility hydraulic system?
To provide hydraulic pressure to operate sub systems for ground operations and some emergencies
What are the sub systems that are operated by the utility hydraulic system?
- Power transfer units
- APU starting System
- Engine starter System
- cargo ramp
- power steering
- swivel locks
- wheel brakes
- center cargo hook
- cargo winch
What are the 17 major components in the utility hydraulic system?
- Hydraulic service module
- Utility reservoir/cooler assembly
- Utility Reservoir pressurization accumulator
- Utility system hand pump
- Electric pump for the utility system Hydraulic accumulator(EPUSHA)
- APU start accumulator
- APU motor/pump
- APU start module
- utility hydraulic aft transmission driven pump
- PTU’s
- AGPU (auxiliary ground power unit)
- utility hydraulic pressure control module
- utility hydraulic return control module
- brake accumulator
- power steering module
- utility hydraulic control panels
- maintenance panel
What are the four sources of pressure for the utility hydraulic system?
- APU start accumulator
- APU motor/pump
- utility hydraulic system pump
- auxiliary ground power unit
What could happen if the fluid level is allowed to go below the sight glass while using the fill module?
Air could get into the system
When should the pilot use the utility reservoir depressurization Valve?
NEVER
EPUSHA operations should not exceed……
5 times during start
When will the APU be used during flight?
Only during emergencies
What component provides the utility hydraulic system Pressure In Flight, under normal conditions?
Utility hydraulic system aft transmission pump
Identify the five accumulators in the utility hydraulic system
- APU start accumulator
- APU start module accumulator
- PWR steering accumulator
- Brake accumulator
- Utility reservoir pressurization accumulator
