FLIGHT CONTROLS AND HYDRAULIC SYSTEM Flashcards Preview

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Flashcards in FLIGHT CONTROLS AND HYDRAULIC SYSTEM Deck (37):
1

The UH-60 flight controls system consists of the

_____, _____, _____ subsystems.

lateral, longitudinal, collective pitch,

and directional control subsystems.

2

Control inputs are transferred from the cockpit to the rotor blades by ______ _____ and assisted by _____ _____. 

mechanical linkages and assisted by hydraulic servos.

3

Pilot control is enhanced by a ____ ____ system (_ _ S),

a ____ ____ system (_ _ S), and an ____ ____ system.

stability augmentation system (SAS),

a flight path stabilization system (FPS),

and an electromechanical trim system.

4

Dual cockpit controls consist of the ____, ____, and ___ ___ pedals.

cyclic, collective, and tail rotor pedals.

5

The pilot and copilot’s controls are routed separately to a

____ ____ for each control axis.

combining linkage for each control axis

6

Output from the cockpit controls is carried by ____ ____, through pilot assist ____, to the ____ unit.

mechanical linkage,

through pilot assist servos,

to the mixing unit.

7

The mixing unit provides ____ inputs, through ____ linkages, to the ___ and ___ rotor controls.

proportional inputs,

through mechanical linkages,

to the main and tail rotor controls.

8

The collective control system provides

_____ helicopter control.

vertical helicopter control

9

The primary collective servos, raise or lower the main rotor ____ , causing the pitch angle of all blades to change

_____. 

The primary collective servos, raise or lower the main rotor swashplate, causing the pitch angle of all blades to change simultaneously

10

Boost servos are located.....

The boost servos are located in the hydraulic compartment forward of the mixing unit.

11

Order of boost servos in the hydraulic compartment.

The collective boost servo is on the right-hand side, and the yaw boost servo is on the far left-hand side of the pilot assist manifold. 

12

Boost servos make it easier for the pilot to:

  • move the pedals and collective stick
  • prevent SAS feedback into the flight controls in the yaw and pitch channels

13

This mechanical mixing unit

combines, sums, and couples cyclic, collective, and yaw inputs.

14

The _____ servos control the non-rotating swashplate, allowing the pilot to control the ____ rotor system.

The primary servos control the non-rotating swashplate, allowing the pilot to control the main rotor system.

15

The cyclic control system provides ____, ____, and ____ control of the helicopter. 

The cyclic control system provides forward, rearward, and lateral control of the helicopter. 

16

When trim is engaged, the ___, ___, and ___ trim systems are activated to maintain the position of the ___ and ___ rotor controls. 

When trim is engaged, the pitch, roll, and yaw trim systems are activated to maintain the position of the cyclic and tail rotor controls. 

17

SAS servos are electrically controlled, _________ actuators, designed to provide enhanced stability in the ___, ___, and ___ axes.

SAS servos are electrically controlled, hydromechanical actuators, designed to provide enhanced stability in the pitch, roll, and yaw axes.

18

The tail rotor (directional) control system determines the helicopter’s heading or ___ by controlling the ____ of the tail rotor blades.

The tail rotor (directional) control system determines the helicopter’s heading or yaw by controlling the pitch of the tail rotor blades.

19

The UH-60 uses a tail rotor servo assembly, which consists of ______ independent stages

arranged in a ______ configuration for redundancy. 

The assembly is mounted in the ___ gearbox. 

The UH-60 uses a tail rotor servo assembly, which consists of two independent stages

arranged in a parallel configuration for redundancy. 

The assembly is mounted in the tail gearbox. 

20

The first stage tail rotor servo is normally pressurized  by the ___ hydraulic system.

The first stage tail rotor servo is normally pressurized  by the #1 hydraulic system.

21

In the event that a malfunction or leak occurs, the TAIL SERVO switch can be selected to ______, at which point the ____ hydraulic pump would provide pressure to operate the second stage of the tail rotor servo.

In the event that a malfunction or leak occurs, the TAIL SERVO switch can be selected to BACKUP, at which point the backup hydraulic pump would provide pressure to operate the second stage of the tail rotor servo.

22

In the event both cables break, the ______ spring places the pilot valve in a position that provides a positive tail rotor pitch of ___° (assuming at least one tail rotor servo is pressurized).

In the event both cables break, this centering spring places the pilot valve in a position that provides a positive tail rotor pitch of 10.5° (assuming at least one tail rotor servo is pressurized).

23

There are ___ redundant main hydraulic systems supported by _____ hydraulic pumps, and an _____ powered backup pump that can pressurize both main systems (simultaneously).

There are two redundant main hydraulic systems supported by separate hydraulic pumps, and an electrically powered backup pump that can pressurize both main systems (simultaneously).

24

The #__ pump module supplies first stage primary servos and the first stage ____ ____ servo.

The #1 pump module supplies first stage primary servos and the first stage tail rotor servo.

25

The #__ pump module supplies second stage primary servos and ____ ____ servos.

The #2 pump module supplies second stage primary servos and pilot assist servos.

26

The ____ pump module supplies the ____ stage tail rotor servo, and recharges the ___. 

As a contingency, it can also supply ___ or ___ stage hydraulic loads.

The backup pump module supplies the second stage tail rotor servo, and recharges the APU

As a contingency, it can also supply first or second stage hydraulic loads.

27

Two ______ _____ connect the hydraulic pressure outputs of the #1 and #2 pumps to the various flight control hydraulic components. 

Two transfer modules connect the hydraulic pressure outputs of the #1 and #2 pumps to the various flight control hydraulic components. 

28

Both hydraulic pump transfer modules are

_____ and _____.

 

The two transfer module _____ are not interchangeable.

Both hydraulic pump transfer modules are

identical and interchangeable.

 

The two transfer module manifolds are not interchangeable.

29

Pilot assist servos assist the pilot to overcome forces induced by the _____ system.

There are:

  • three ____ servos: ___, ___, and ____
  • three ___ servos
  • a ___ ___ servo.

Pilot assist servos assist the pilot to overcome forces induced by the rotor system.

There are:

  • three boost servos: collective, yaw, and pitch
  • three SAS servos
  • a pitch trim servo.

30

The backup hydraulic system supplies pressure through the utility module to the ______ stage tail rotor servo, and it recharges the ___ accumulator following APU starts. 

 

The backup hydraulic system supplies pressure through the utility module to the second stage tail rotor servo, and it recharges the APU accumulator following APU starts. 

31

The backup hydraulic system also supplies pressure to the #1 and #2 ______ modules to operate all servos normally supplied by the #1 and #2 ______ systems when those systems are not operational.

The backup hydraulic system also supplies pressure to the #1 and #2 transfer modules to operate all servos normally supplied by the #1 and #2 hydraulic systems when those systems are not operational.

32

APU accumulator supplies a _____-psi hydraulic charge to the APU start motor. 

APU accumulator supplies a 3,000-psi hydraulic charge to the APU start motor. 

33

Hydraulic fluid in the accumulator is used to compress a charge of _______. 

Hydraulic fluid in the accumulator is used to compress a charge of nitrogen

34

The APU accumulator holds a nitrogen precharge of about ____ psi.

The APU accumulator holds a nitrogen precharge of about 1,450 psi.

35

During the recharge cycle the accumulator is automatically pressurized to approximately ____ psi (± ___).

During the recharge cycle the accumulator is automatically pressurized to approximately 2,850 psi (± 150).

36

When the accumulator nitrogen charge drops to about ____ psi, the APU ____ ___ advisory light will illuminate, and the backup pump will automatically come on.

When the accumulator nitrogen charge drops to about 2600 psi, the APU ACCUM LOW advisory light will illuminate, and the backup pump will automatically come on.

37