Flight Controls & Hydraulics

Question 1

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

Answer 1

Be restored because the hydraulic solenoid valve is a fail safe switch

Question 2

In a conventional flight control system, the cyclic is used to

Answer 2

Direct and total lift/thrust component in flight

Question 3

The TH-67 hydraulic pump is constant ____, _____ deliver system component providing 600 +/- 25 PSI and ____ GPM flow rate.

Answer 3

Pressure, variable, 1.9

Question 4

The purpose of the differential relief valve on the hydraulic control servo actuator is to

Answer 4

Relieves pressure build up due to excessive rotor loads

Question 5

The cooling air for the hydraulic reservoir is provided by

Answer 5

The oil cooler fan which also provides cooling air to the engine and transmission oil systems

Question 6

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

Answer 6

Intermixing bell crank

Question 7

The purpose of the hydraulic servo actuator installed to the cyclic and collective control linkages is to convert _____ _____ _____ into ______ _____ _____

Answer 7

Fluids under pressure, useful mechanical work

Question 8

What changes the pitch (angle of attack) in the two rotor through the lever assembly?

Answer 8

Pitch change links

Question 9

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

Answer 9

Tail rotor

Question 10

Why is the hydraulic solenoid valve said to be fail-safe switch in the event of an electrical failure?

Answer 10

The solenoid valve is spring loaded open thus requiring electrical power to stop hydraulics

Question 11

The ______ controls the forward, aft, and lateral movements of the helicopter

Answer 11

Cyclic

Question 12

Which flight control provide directional control (heading) at a hover?

Answer 12

Anti-torque pedal

Question 13

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

Answer 13

The filter is clogging - failure of the hydraulic assist will progressively occur

Question 14

What TH-67 flight control component combines (coordinates) cyclic and collective control inputs to the main rotor?

Answer 14

Intermixing bellcrank

Question 15

The TH-67 flight control system can best be described as a

Answer 15

Direct mechanical linkage with the hydraulic assist

Question 16

Which collective control stick is removable and why?

Answer 16

The co-pilot’s collective stick in case a non-rated passenger is flown

Question 17

How does a hydraulic failure affect the ability to control your tail rotor?

Answer 17

Has NO effect

Question 18

The TH-67 flight control system can be described as _____, _____, ____ with hydraulic assist.

Answer 18

Direct, mechanical, linkage

Question 19

In the VFR configuration, what happens to the pilot’s cyclic stick when left unattended if the copilot’s cyclic is removed?

Answer 19

The reduced load on the balance spring will cause the pilot’s cyclic stick to creep aft slightly

Question 20

Where is the collective friction knob located?

Answer 20

Located at the base and left of the pilot’s collective stick

Question 21

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?

Answer 21

Contact maintenance personnel, reset the “pop-up” button and check at normal engine operating RPM

Question 22

In a conventional helicopter, what flight control directs the total lift/thrust of the main rotor system?

Answer 22

The cyclic

Question 23

In a conventional helicopter flight control system, the tail rotor’s primary purpose is to

Answer 23

Counteract the torque effect of the main rotor

Question 24

States the switches that are on the pilot’s collective control head on the VFR configuration aircraft.

Answer 24

Landing light, search light, EXT/RETR, governors RPM INCE/DECR, and start button

Question 25

Which of the following TH-67 flight control do not have hydraulic assist?

Answer 25

Anti-torque pedals/tail rotor controls

Question 26

The purpose of the hydraulic servo actuator installed to the cyclic and collective is to convert ____ into _____

Answer 26

Hydraulic (fluid) under pressure, useful mechanical work

Question 27

How much preload is on the cyclic system with the aircraft running and hydraulic on?

Answer 27

1/2 to 1 lb preload

Question 28

An ______ movement of the ______ control increases the pitch angle in both main rotor blades thereby increasing the ____ of the main rotor disc.

Answer 28

Upward, collective, lift/thrust

Question 29

The TH-67 hydraulic reservoir outer case is finned to provided cooling. In addition, cooling air is scavenged and directed to the ______________

Answer 29

Oil cooler fan, aft base of the hydraulic reservoir

Question 30

In a conventional helicopter, the 3 basic flights control used to maneuver the aircraft are the ____,____, and _____

Answer 30

Cyclic, collective, anti-torque pedals

Question 31

What amount of collective control preload is built into collective flight control system?

Answer 31

A 3 to 5 pound preload

Question 32

Where is the cyclic friction knob located?

Answer 32

Below and left of the base of the pilot’s cyclic base

Question 33

Which direction can the tail rotor pedals be adjusted?

Answer 33

Fore and aft

Question 34

What serves as a mechanical lockout and prevents the pilot from inadvertently closing the throttle?

Answer 34

Idle release button

Question 35

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

Answer 35

The torque will cause the fuselage to rotate in the opposite direction of the main rotor

Question 36

What is the preload on the tail rotor system?

Answer 36

The preload is 4 to 5 pounds

Question 37

The purpose of the differential valve is to reduce ____ _____ _____ where rotor loads are increased due to high “G” maneuvering or flight into turbulence

Answer 37

Pressure build up

Question 38

What changes the pitch (angle of attack) in the tail rotor through the lever assembly?

Answer 38

The pitch change links

Question 39

What switches are located on the co-pilot’s collective control head?

Answer 39

There is no Co-pilot’s collective control head

Question 40

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?

Answer 40

Collective control

Question 41

Does the tail rotor system have hydraulic assist?

Answer 41

No, the tail rotor system does not have hydraulics

Question 42

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?

Answer 42

Manually reset button, run aircraft to operating rpm and check to see if button popped again

Question 43

Which aircraft configuration has the force trim system?

Answer 43

The IFR configuration ONLY

Question 44

The TH-67 hydraulic system is a ______ pressure through a ______ delivery system at operating RPM

Answer 44

Constant, variable

Question 45

Due to aircraft vibration or a hydraulic system pressure surge you may have?

Answer 45

The red button on the hydraulic filter may “pop-up”

Question 46

A clogged hydraulic pressure filter will result in _______________

Answer 46

Loss of hydraulic assistance to the flight controls