Flight Controls & Hydraulics Flashcards
During a simulated hydraulics malfunction the hydraulic system control switch on the miscellaneous control panels 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
In a conventional flight control system, the cyclic is used to
Direct and total lift/thrust component in flight
The TH-67 hydraulic pump is constant ____, _____ deliver system component providing 600 +/- 25 PSI and ____ GPM flow rate.
Pressure, variable, 1.9
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 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
Flight control inputs (cyclic and collective) are considered independent up to the ___ ____ ____ from there on up to be non-rotating swashplate they are considered coordinated
Intermixing bell crank
The purpose of the hydraulic servo actuator installed to the cyclic and collective control linkages is to convert _____ _____ _____ into ______ _____ _____
Fluids under pressure, useful mechanical work
What changes the pitch (angle of attack) in the two rotor through the lever assembly?
Pitch change links
The _____ _____ control(s) will provide directional control (heading) of the aircraft during hovering operations, as well as the trimming the fuselage of the helicopter at higher speeds
Tail rotor
Why is the hydraulic solenoid valve said to be fail-safe switch in the event of an electrical failure?
The solenoid valve is spring loaded open thus requiring electrical power to stop hydraulics
The ______ controls the forward, aft, and lateral movements of the helicopter
Cyclic
Which flight control provide directional control (heading) at a hover?
Anti-torque pedal
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
What TH-67 flight control component combines (coordinates) cyclic and collective control inputs to the main rotor?
Intermixing bellcrank
The TH-67 flight control system can best be described as a
Direct mechanical linkage with the hydraulic assist
Which collective control stick is removable and why?
The co-pilot’s collective stick in case a non-rated passenger is flown
How does a hydraulic failure affect the ability to control your tail rotor?
Has NO effect
The TH-67 flight control system can be described as _____, _____, ____ with hydraulic assist.
Direct, mechanical, linkage
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 collective friction knob located?
Located at the base and left of the pilot’s collective stick
The red pop-up button on the hydraulic filter activates (pops up) at 70 PSID. If the red button on the hydraulic filter is found “popped” during preflight, you should?
Contact maintenance personnel, reset the “pop-up” button and check at normal engine operating RPM
In a conventional helicopter, what flight control directs the total lift/thrust of the main rotor system?
The cyclic
In a conventional helicopter flight control system, the tail rotor’s primary purpose is to
Counteract the torque effect of the main rotor
States the switches that are on the pilot’s collective control head on the VFR configuration aircraft.
Landing light, search light, EXT/RETR, governors RPM INCE/DECR, and start button
Which of the following TH-67 flight control do not have hydraulic assist?
Anti-torque pedals/tail rotor controls
The purpose of the hydraulic servo actuator installed to the cyclic and collective is to convert ____ into _____
Hydraulic (fluid) under pressure, useful mechanical work
How much preload is on the cyclic system with the aircraft running and hydraulic on?
1/2 to 1 lb preload
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
The TH-67 hydraulic reservoir outer case is finned to provided cooling. In addition, cooling air is scavenged and directed to the ______________
Oil cooler fan, aft base of the hydraulic reservoir
In a conventional helicopter, the 3 basic flights control used to maneuver the aircraft are the ____,____, and _____
Cyclic, collective, anti-torque pedals
What amount of collective control preload is built into collective flight control system?
A 3 to 5 pound preload
Where is the cyclic friction knob located?
Below and left of the base of the pilot’s cyclic base
Which direction can the tail rotor pedals be adjusted?
Fore and aft
What serves as a mechanical lockout and prevents the pilot from inadvertently closing the throttle?
Idle release button
In a conventional helicopter, the rotation of the main rotor induces a force known as torque. Describes 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
What is the preload on the tail rotor system?
The preload is 4 to 5 pounds
The purpose of the differential valve is to reduce ____ _____ _____ where rotor loads are increased due to high “G” maneuvering or flight into turbulence
Pressure build up
What changes the pitch (angle of attack) in the tail rotor through the lever assembly?
The pitch change links
What switches are located on the co-pilot’s collective control head?
There is no Co-pilot’s collective control head
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?
Collective control
Does the tail rotor system have hydraulic assist?
No, the tail rotor system does not have hydraulics
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
Which aircraft configuration has the force trim system?
The IFR configuration ONLY
The TH-67 hydraulic system is a ______ pressure through a ______ delivery system at operating RPM
Constant, variable
Due to aircraft vibration or a hydraulic system pressure surge you may have?
The red button on the hydraulic filter may “pop-up”
A clogged hydraulic pressure filter will result in _______________
Loss of hydraulic assistance to the flight controls
