flight controls on the helicopter ?
Cyclic
collective
anti torque pedals
hydraulic systems provide ?
control boost and eliminate feedback from rotor system
hydraulic accumulators function?
provide a limit number of controls movements in the event of failure, charge with nitrogen needs to be tested regurlaly
dual hydraulic systems function ?
dual servo is one part with 2 separate pistons, parallel independent systems
swashplates assemblies
friction adjustment and torque range
flight and engine control rigging musts ?
- controls must move in the correct direction, correct distance and correct authority or amount
- must be secure and safety
- must not have any interaction with other parts
Bell flight control rigging Main rotor
- Zero or reference points will be establish by fix points
- hydraulic pilot valves must be properly positioned
- adjustments are made to match a specific point.
Robison Flight control rigging tail rotor
- blade angle measurements are made directly on the blade for giving control position
- adjustments are made to match a specific angle
types of engine control that all helicopters will have
- proactive
- reactive
what means proactive engine control?
anticipating changes in power requirements and making adjustments before they are required
what means reactive engine control?
sensing workload and making an adjustments to maintain rotor RPM (Nr)
Piston engine control characteristics
- Throttle (control by pilot )
- correlation (senses pilot control inputs -proactive)
- Governor (senses RPM -Reactive )
Turbine engine controls characteristics
- Throttle (control by pilot)
- Droop compensator or anticipator(senses pilot flight control input and is proactive)
- Governor (senses N2 RPM -Reactive)
in a piston engine the Throttle, correlation and governor are all connected to the ________or fuel injection servo
carburetor
on piston engine fuel mixture is left ______during the flight
full rich
on a turbine engine throttle is connected to the __________and is used primarily for start up and shut down
fuel control unit
in a turbine engine Droop compensator is connected to the _______________and controls the ___________at flight settings
power turbine governor, controls the engine
the droop compensator is used to ?
maintain rotor RPM based on flight controls inputs
Turbine engine fuel control unit function?
- controls the fuel delivered to the fuel nozzles
- connected to the pilots throttle
- manages engine starts
- provides positive fuel shut off
- senses N1 speed
power turbine governor function?
- Connected to the collective via droop compensator
- “tells” the FCU how manage the fuel at operational speeds .
- Senses N2 `
what is a beep switch or governor trim?
switch on the collective is connected to a linear actuator in the droop compensator system that will change the position of the control arm on the governor., allowing the pilot make adjustments to the compensator for different ambient pressures.
what is autorotation?
The process of turning the rotor from air passing up from below also the maneuver associated with flying and landing without power from
In the event of an engine failure the pilot must _______to the down stop. (autorotation)
lower the collective
Most helicopters set the Auto-revs by adjusting the length of the pitch links. All pitch links must be adjusted. Each pitch link must be adjusted exactly the same amount. so if the RPM is to slow ___________and if the RPM is to fast you need to _________
- shorten all the pitch links
- lengthen all the pitch links.
