Utility hydraulics Flashcards
- What is the purpose of the utility hydraulic system?
primarily used for ground operations
- What are the sub-systems that are operated by the utility hydraulic system?
Power xfer unit, APU start system, ENG start system, Cargo ramp, power steering, swivel locks, wheel brakes, center cargo hook, cargo winch/rescue hoist
(1) Hydraulic service module.
near ramp on #2 side. used to refill hydraulic system.
(2) Utility Reservoir/Cooler assembly.
aft pylon hydraulic compartment, cools hydraulic fluid
(3) Utility Reservoir Pressurization Accumulator. (Pre-flt pressure 2500-3500 or 3000 psi)
maintains pressure on utility reservoir/cooler assembly next to utility reservoir
(4) Utility System Hand pump.
next to ramp #2 side, used to re-pressurize start accumulator
(5) Electric Pump for the Utility System Hydraulic Accumulator (EPUSHA).
next to system hand pump, electrically recharges start accumulator
(6) APU Start Accumulator. (Pre-flt pressure 2500-3500 or 3000 psi)
2 side above ramp, used to hold hydraulic pressure to start APU
(7) Auxiliary Power Unit (APU) Motor/Pump.
On the APU to start turbine and above 90% work as a pump to create pressure
(8) APU Start Module. (Pre-flt pressure 2500-3500 or 3000 psi)
2 side above ramp, Stops the start accumulator from discharging
(9) Utility Hydraulic Aft Transmission Driven Pump.
located of aft transmission, main pump to provide pressure to hydraulic system
(10) Flight Hydraulic Power Transfer Unit (PTU).
located in forward and aft pylon, provide pressure for flight control hydraulic system.
(11) Auxiliary Ground Power Unit (AGPU).
not on the aircraft, provides pressure and electricity as needed
(12) Utility Hydraulic Pressure Control Module.
on #1 side above ramp, controls where hydraulic pressure is sent and filters fluid also monitors pressure
(13) Utility Hydraulic Return control module.
2 side above ram, filters return fluid and gathers fluid from systems
(14) Brake Accumulator
forward pylon, holds pressure emergency brake applications
(15) Power Steering Module.
2 side on wall near ramp, for emergency swivel lock operation
(16) Utility Hydraulic Control Panels.
located on overhead console, used to control pressure to subsystems (check for systems)
(17) Maintenance panel.
2 side on wall next to ramp, shows system information for all hydraulic systems
- What are the four sources of pressure for the utility hydraulic system?
APU start accumulator, APU motor pump, Utility hydraulic system pump, AGPU
- When can the fill module be used to add fluid to the hydraulic systems?
on ground or in flight
- What could happen if the fluid level is allowed to go below the sight glass while using the fill module?
you will start pumping air into the hydraulic system
- What is the purpose of the visual fluid indicator on the hydraulic reservoir?
to let you know if you need to add fluid to the system
- What should the gauge indication be on the utility reservoir pressurization accumulator be during pre-flt?
in the green band
- When should a pilot use the utility reservoir depressurization valve?
never
- Why should EPUSHA operations not exceed five?
it will kill the battery
- What should the pressure indicate during pre-flt on the APU start accumulator?
3,000 PSI
- What is the Emergency Utility Pressure Valve used for and what position should the valve be in during pre-flt?
NORMAL, allows the APU start accumulator or hand pump to pressurize system
- What should the pressure indicate during pre-flt on the APU start module accumulator?
approx. 3,000 PSI
- When would the APU motor pump be used during flight?
when the transmission driven utility pump fail during flight
- What component provides the utility hydraulic systems pressure in flight, under normal conditions?
utility hydraulic pump
- What provides the utility hydraulic pressure indications to the crew?
the pressure control module
- What should be checked on the pressure control module during pre-flt?
general condition and security
- What should be checked on the return control module during pre-flt?
general condition and security
- What indications are provided on the maintenance panel for the utility hydraulic system?
pressure, temp, reservoir level, filter change, pump fault
