![]() Notice the primary flight controls are missing from this list – they have moved to the the flight control configuration in Plane Maker, Control Geometry, Hydraulic tab. wheel brakes (through an accumulator that will store pressure for a few brake applications)Įach of these will not be able to operate without hydraulic pressure from at least one selected source, or operate at reduced deflection, speed, or efficacy at low pressures.landing gear (see the article on hydraulic landing gear actuators for more detail).Hydraulic actuators (power consumers)Įach of these can be assigned on or more hydraulic actuators, so they can be powered from one or multiple systems: This is a purely mechanical operation, no electric power or sensors are needed for this to work. This causes the characteristic on-off-cycle that on some airplanes can be heard as a “barking dog” sound. In auto mode, which is the default, the PTU is watching for a pressure differential and will turn on and off as needed to keep it minimal. When pressure differential is minimized, it will fall back to state 1 PTU is running currently, trying to equalize pressure.PTU is armed and watching for pressure differential.PTU is off, and no power transfer takes place.Sim/cockpit2/hydraulics/actuators/PTU int y enum When installed in the plane, the PTU has three possible states during flight: Note that the PTU only transfers power, but no fluid is transferred between systems. ![]() The PTU can either be uni-directional, allowing power transfer only in the specified direction, or bi-directional, in which case it will keep the weaker system powered by the stronger system, as long as the weaker system has enough hydraulic fluid left. The power transfer unit can be installed with Plane Maker to allow power transfer between system 1 (left) and system 2 (right). Sim/cockpit2/hydraulics/actuators/ram_air_turbine_on int y boolean Hydraulic PTU Alternatively, the RAT can also be controlled manually with the dataref The RAT (ram-air turbine) automatically activates if it has been assigned in Plane Maker, and the airplane is off the ground (weight-off-wheels) and all other hydraulic sources have failed and some time has passed for pressure to bleed from the system. Sim/operation/failures/rel_hydpmp_ele and /rel_hydpmp_el2 If assigned in Plane Maker, the pumps will consume the assigned amps from their electrical busses, and can be failed with their failure datarefs Sim/cockpit2/hydraulics/actuators/electric_hydraulic_pump2_on int y booleanĪgain, switching them on does nothing unless the pump has been assigned a hydraulic system in Plane Maker. Sim/cockpit2/hydraulics/actuators/electric_hydraulic_pump_on int y boolean ![]() The electric pumps are switched with the datarefs Note that these datarefs do nothing if the pump hasn’t been assigned to provide pressure to any system in Plane Maker. Sim/cockpit2/hydraulics/actuators/prop_pump int y boolean respectively. Sim/cockpit2/hydraulics/actuators/engine_pump int y boolean and
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