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TH-67 Flight Controls and Hydraulics
Terms in this set (48)
The ____________ controls the forward, aft, and lateral movements of the helicopter.
Flight control inputs (cyclic and collective) are considered independent up to the _____________ from there on up to the non-rotating swashplate they are considered coordinated.
Intermixing bell crank
In a conventional helicopter flight control system, the tail rotor's primary purpose is to ___________________________________.
Counteract the torque effect of the main rotor.
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.
Why is the hydraulic solenoid valve said to be a fail-safe switch in the event of an electrical failure?
The solenoid valve is spring loaded open thus requiring electrical power to stop hydraulics.
What TH-67 flight control component combines (coordinates) cyclic and collective control inputs to the main rotor?
What conventional flight control best describes an input that is made in each blade simultaneously in the main rotor disc plane regardless of the blades position?
In the VFR configuration, what happens to the pilot's cyclic stick when left unattended if the copilot's cyclic is removed?
The reduced load on the balance spring will cause the pilot's cyclic stick to creep aft slightly.
Where is the cyclic friction knob located?
Below and left of the base of the pilot's cyclic base.
On the TH-67, a red "pop-up" indicator installed on the pressure line filter on the line from the pump to the hydraulic solenoid valve will "pop-up" when the pressure differential reached 70 PSID. This is an indication to the pilot that ______________________________________________________.
The filter is clogging—failure of the hydraulic assist will progressively occur.
How does a hydraulic failure affect the ability to control your tail rotor?
Has NO effect
Which direction can the tail rotor pedals be adjusted?
Fore and aft.
Which collective control stick is removable and why?
The co-pilot's collective control stick in case a non-rated passenger is flown.
The purpose of the hydraulic servo actuator installed to the cyclic and collective control linkages is to convert ______________ into _____________________.
Fluid under pressure, useful mechanical work
During a simulated hydraulics malfunction the hydraulic system control switch on the miscellaneous control panel is placed in the OFF position. If the aircraft loses all electrical power, hydraulic assist to the flight controls will _____________________________________________.
Be restored because the hydraulic solenoid valve is a fail safe switch.
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, the three basic flight controls used to maneuver the aircraft are the _____________, ___________________, and ___________________.
Cyclic, collective, anti-torque pedals
Which flight control provides directional control (heading) at a hover?
A/An ___________ movement of the _____________ control increases the pitch angle in both main rotor blades thereby increasing the __________________ of the main rotor disc.
Upward, collective, lift/thrust
Which aircraft configuration has the force trim system?
The IFR configuration only.
Where is the collective friction knob located?
Located at the base and left of the pilot's collective stick.
The TH-67 hydraulic reservoir outer case is finned to provide cooling. In addition, cooling air from the _____ ________ _______ is directed to the transmission oil cooler where some air is scavenged and directed to the ____________________________.
Oil cooler fan, aft base of the hydraulic reservoir
What changes the pitch (angle-of-attack) in the tail rotor through the lever assembly?
The pitch change links.
What amount of collective control preload is built into the collective flight control system?
A 3 to 5 pound preload.
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.
The TH-67 flight control system can best be described as ___________ _____________ _______________ with hydraulic assist.
Direct, mechanical, linkage
The cooling air for the hydraulic reservoir is provided by____________________________.
The oil cooler fan which also provides cooling air to the engine and transmission oil systems.
Cyclic control inputs (fore/aft and lateral) are considered independent up to the _____________ _________________ from there on up to the non-rotating swash plate they are considered __________________________.
Intermixing bell crank, coordinated
How much preload is on the cyclic system with the aircraft running and hydraulics on?
One half to one pound preload.
State the switches that are on the pilot's collective control head on the VFR configured aircraft.
Landing light, search light, EXT/RETR, governor RPM INCR/DECR, and start button
In a conventional helicopter flight control system, the cyclic is used to _______________________.
Direct the total lift/thrust component in flight.
Which of the following TH-67 flight controls do not have hydraulic assist?
Anti torque pedals / tail rotor controls
In a conventional helicopter, the rotation of the main rotor induces a force known as torque. Describe the effect that this force has on the helicopter fuselage.
The torque will cause the fuselage to rotate in the opposite direction of the main rotor.
An upward movement of the collective control increases the pitch angle in each main rotor blade thereby increasing the _______________ of the main rotor disc.
The red pop-up button on the hydraulic fliter acitivates (pops up) at 70 PSID. If the red button on the hydraulic fliter is found "popped" during preflight, you should?
Contact maintenance personnel, reset the "pop-up" button and check at normal engine operating RPM.
What switches are located on the pilot's collective stick control head?
Search light switches, landing light, governor RPM increase/decrease, and starter button.
In a conventional helicopter, what flight control directs the total lift/thrust of the main rotor system?
The TH-67 flight control system can best be described as a ________________________________________.
Direct mechanical linkage with hydraulic assist.
What is the preload on the tail rotor system?
The preload is 4 to 5 pounds.
A clogged hydraulic pressure filter will result in ________________.
Loss of hydraulic assistance to the flight controls.
The purpose of the differential relief valve on the hydraulic control servo actuator is to ____________________________?
Relieves pressure build up due to excessive rotor loads
The purpose of the hydraulic servo actuator installed to the cyclic and collective controls is to convert ____________________ into ______________________.
Hydraulic (fluid) under pressure, useful mechanical work.
What changes the pitch (angle of attack) in the tail rotor through the lever assembly?
Pitch change links
The TH-67 hydraulic system is a_________ pressure through a _____________ delivery system at operating RPM.
The purpose of the differential relief valve is to reduce ______________________ when rotor loads are increased due to high "G" maneuvering or flight into turbulence.
Pressure build up
The TH-67 hydraulic pump is a constant _____________, ___________ delivery system component providing 600 +/- 25 PSI, and _________ GPM flow rate.
Pressure, variable, 1.9
Does the tail rotor system have hydraulic assist?
No, the tail rotor system does not have hydraulics.
Due to aircraft vibration or a hydraulic system pressure surge you may have?
The red button on the hydraulic filter may "pop up"
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