Systems Flashcards
What are the principle components of the engine driven fuel system.
- Engine driven fuel pump
- Gas producer fuel control
- Power turbine governor
- Accumulator
- Fuel nozzle
The engine driven fuel pump produces how much PSI?
600 PSI based on N1 speed.
The engine driven fuel pump sends fuel to the?
Fuel control for metering.
The gas producer fuel control and power turbine governor provide for a fuel metrering system. The system gets its inputs from 4 inputs. What are the 4 inputs.
- Gas producer RPM
- Power Turbine RPM
- Compressor discharge pressure.
- Throttle position.
Major functions of the fuel control?
Meters fuel into the engine. Determines idle speed, fuel flow for initial combustion process and start acceleration. Once twist grip is in full open position the fuel control unit will control the fuel flow into the engine based upon the pneumatic signal received by the power turbine governor.
What maximum shaft horsepower does the fuel control limit to?
575 SHP
Where is the fuel line accumulator? What is it’s basic purpose?
Located between the fuel control and governor. It’s purpose is to dampen pressure signals between the fuel control and governor to maintain constant N1
Basic relationship of the power turbine governor and the fuel control.
The gas producer speed levels are established by the governor which senses N2 speed. The n2 governor sends pneumatic signals to the fuel control to increase or decreases the level of fuel in the combustion chamber.
Basic description of the droop compensator construction.
Operated by a bellcrank in the collective system.
Mechanical linkage between the idler in the collective system and a lever mounted on the power turbine governor shack. Movement of the collective stick results repositioning of the governor shaft.
Main purpose of the droop compensator.
The compensator maintains N2 rpm as power demand is increased.
Droop is defined as the speed change in N2 engine rpm as power is increased from no load condition.
What is the brand name of the main rotor driveshaft.
Kaflex.
Made as a flexible drive coupling to allow smooth transfer of torque when the transmission and freewheeling unit are not aligned.
The transmission is restrained and mounted by what type of system
Nodal beam suspension and restraint.
What type of main rotor system?
Semi rigid underslung with two metal blades.
The tension torsion strap AKA the TT strap serves what purpose?
Transfers centrifugal loading from the blades to the yoke and also assist to counteract aerodynamic forces. Provides connection between the grips and the yoke.
Are the MR blades symmetrical or Asymmetrical?
The blades have significant camber on the first 1/3 of the blades followed by flat symmetrical surface on the aft 2/3. The use of a droop- snoot airfoil section provides significantly better performance in a hover.
