Flight Controls and hydraulic system Flashcards
Left pedal
Increase tail rotor thrust
Pilot cyclic stick
Permanent mount
Cyclic control inputs are considered independent up to the intermixing bell rank.
T/R is unique because…..
Only flight control without hydraulics
1/2 to 1 pound pre-load is installed on what side?
Copilot
Force trim is only on what configuration?
IFR
Cyclic control inputs (fore/aft and lateral) are considered independent up to the ___________ __________ from there on up to the non-rotating swashplate they are considered ___________.
Intermixing bellcrank, coordinated
What switches are on the collective control head
Search light switches, landing light, governor RPM increase/decrease, starter button
Hydraulic system
Hydraulic pump and regulator assembly
Constant pressure at operating rpm 600 +/- 25 psi with 1.9 GPM delivery rate.
Hydraulic pressure filter red button pops at what psid?
70
Differential relief valve
Relieves pressure build up which could occur from excessive rotor loads.
Sequence valve
Prevents the irreversibility of hydraulic fluid in the event of hydraulic pressure loss.
Why is the hydraulic solenoid valve said to be a fail-safe switch in the event of an electric failure?
The solenoid valve is spring loaded open thus requiring electrical power to stop hydraulics.
Where is the collective friction knob located?
Located at the base and left of the pilot’s collective stick.
An upward movement of the collective control increases the pitch angle in each main rotor blade thereby increasing the _____________ of the main rotor disc.
Lift/thrust
If the red pop-up button on the hydraulic filter is found to be popped during preflight, the prescribed action would be to contact maintenance and to do what?
Manually reset button,run aircraft to operating rpm and check to see if button popped again.
The _____________ control(s) will provide directional control (heading) of the aircraft during hovering operations, as well as trimming the fuselage of the helicopter at higher speeds.
Tail rotor
What amount of collective control preload is built into the collective flight control system?
A 3 to 5 pound preload
What is the preload on the tail rotor system?
The preload is 4 to 5 pounds.
In a conventional helicopter, what flight control directs the total lift/thrust of the main rotor system?
The cyclic
Due to aircraft vibration or a hydraulic system pressure surge you may have?
The red button on the hydraulic filter may “pop up”
What switches are located on the co-pilot’s collective control head?
There is no co-pilot’s collective control head.
In a conventional helicopter flight control system, the cyclic is used to _____________.
Direct the total lift/thrust component in flight.
Which flight control provides directional control (heading) at a hover?
Anti-torque pedal
Where is the cyclic knob located?
Below and left of the base of the pilot’s cyclic base.
