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UH60A/L Systems > Flight controls & Hydraulics > Flashcards

Flight controls & Hydraulics Flashcards

1
Q

Which 5 lights will activate the back-up pump?

A

1 RSVR LOW

APU ACCUM LOW

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2
Q

What combines, sums and couples cyclic, collective and yaw inputs?

A

Mechanical Mixing Unit (MMU)

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3
Q

What hydraulic systems provides pressure to the 2nd stage tail RTR servo?

A

Backup HYD system

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4
Q

The backup hydraulic pump provides hydraulic pressure in case of failure of the #1 and/or #2 hydraulic pumps and for ______ ______ ______?

A

Ground operation checks

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5
Q

What are the positions on the BACKUP HYD PUMP switch?

A

ON, OFF, AUTO

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6
Q

Where is the TAIL SERVO switch located?

A

On the center console, misc. panel marked MISC SW

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7
Q

The collective and yaw boost servos are turned on and off by pressing the switch marked _______ on the AFCS panel.

A

BOOST

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8
Q

The pilot’s assist is normally pressurized by what HYD system?

A

No. 2 HYD system

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9
Q

SAS enhances dynamic stability and provides ______ ?

A

short-term rate damping in the pitch, roll, and yaw axis.

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10
Q

Inside the hydraulic pump, what shears to prevent any damage to the accessory modules in the evemt of mechanical failure?

A

Shear shaft

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11
Q

What are the four components on/within the transfer module?

A

Primary Shutoff valve

Transfer valve

Secondary shutoff valve

Pressure pump switch

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12
Q

How many indicator buttons are on each hydraulic system?

A

2

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13
Q

What are the primary servos (names), right to left while looking forward?

A

Forward

Aft

Lateral

(Fat Ass Lady)

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14
Q

What does the electrical interlocks prevent?

A

Both flight control servo stages from being turned off simultaneously.

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15
Q

Where is the Servo shutoff switch located?

A

Pilot or co-pilot collective head.

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16
Q

How is the #1 stage tail servo pressurized?

A

Normally: #1 hydraulic system

Emergency: Backup hydraulic system

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17
Q

What happens if both tail rotor control cables fail?

A

A centering spring on the servo will position tail rotor servo input linkage to provide 10,5 degrees of pitch.

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18
Q

The tail servo moves the ___________ that extends through the tail gear box to the pitch change links, to the tail rotor blade paddles.

A

pitch change shaft

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19
Q

1 RSVR LOW means hydraulic fluid level is below?

A

60% of full capacity.

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20
Q

What does the FLT PATH STAB advisory indicate?

A

The FPS is inop. in one or more axis.

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21
Q

What are the three hydraulic pressure supply systems?

A

1, #2 and Backup

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22
Q

What caution appears if the No. 1 hydraulic pump pressure is lost/below min.?

A

1 HYD PUMP

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23
Q

Which cautions/advisories cause hydraulic logic to automatically bring on the back-up hydraulic pump?

A

1 HYD PUMP

APU ACCUM LOW

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24
Q

When APU ACCUM LOW appears, hyd logic will bring on the backup hyd pump if the BACKUP HYD PUMP switch is in which position?

A

Any position (In flight, WOW will make OFF default to auto)

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25
Q

On the transfer module there are how many shutoff valves?

A

2

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26
Q

The pressure switch in the transfer module activates the #1 HYD PUMP caution when pressure drops below?

A

Minimum (2000 PSI)

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27
Q

What are the TAIL SERVO switch positions?

A

Normal

Backup

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28
Q

What are the malfunction types?

A

Leaks

Mechanical

Jams

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29
Q

In the #1 hydraulic system, how many steps are there to the hydraulic logic module Leak Detection/Isolation (LDI) sequence?

A

3

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30
Q

The indication that the leak was not in the tail rotor servo is when?

A

1 HYD PUMP light illuminates

31
Q

The pilot assist module has a pressure reducer with a relief valve for the pitch trim actuator. What does it do?

A

Reduces normal system pressure from 3000 to 1000 PSI.

32
Q

What does the transfer valve do?

A

Allows only one pump to provide pressure to the hydraulic system at a time.

33
Q

What is the final light to illuminate for a primary servo jam?

A

1 or #2 PRI SERVO PRESS

34
Q

The FLT PATH STAB (computer light) will remain on until?

A

The pilot does a Power On Reset.

35
Q

What does the Backup Pump supply hydraulic pressure to?

A

2 TAIL RTR SERVO

Utility Module

APU accumulator

36
Q

With two hyd systems inop, airspeed shall be limited to?

A

150 KIAS

140 IMC

37
Q

Bank angles shall be limited to ________ when a PRI SERVO PRESS caution appears?

A

30 degrees

38
Q

1 PRI SERVO PRESS indicates?

A

Lack of pressure or mechanical failure of one or more of the #1 Primary servos

39
Q

If both tail rotor cables fail, a centering spring will position the tail rotor servo linkage to provide ______ degrees pitch

A

10 1/2

40
Q

When performing hydraulic leak test (HYD LEAK TEST switch in TEST pos), what lights appear?

A

Master caution * 2

Cautions:

  • # 1 Tail RTR SERVO
  • BOOST SERVO OFF
  • SAS OFF
  • # 1 and #2 RSVR LOW
  • BACK-UP RSVR LOW

Advisories:

  • # 2 TAIL RTR SERVO ON
  • BACK-UP PUMP ON
41
Q

When performing the tail rotor servo transfer check and the TAIL SERVO switch is in BACKUP, the BACK-UP PUMP ON should appear within how many seconds?

A

3-5 seconds

42
Q

What are the cockpit indications for a leak in the No. 1 HYD pump module?

A
  • both MASTER CAUTION
  • # 1 RSVR LOW
  • # 1 HYD PUMP
  • BACKUP PUMP ON
43
Q

What happens if pilot action is not taken when a leak occurs at the 1st stage primary servo?

A

A loss of both the No. 1 and back-up hydraulic systems

44
Q

A hardover failure of the collective boost servo will increase control forces as much as ______ pounds in the collective.

A

150 pounds

45
Q

What indicates a TAIL ROTOR QUADRANT caution, with no change in handling characteristics?

A

One tail rotor cable broke

46
Q

What are the functions of the MMU?

A

Collective to Pitch

Collective to Roll

Collective to Yaw

Yaw to Pitch

47
Q

What system normally pressurizes the Pilot Assist Area?

A

2 HYD system

48
Q

What controls are maintained when trim is engaged and the pitch, roll, and yaw trim systems are activated?

A

Cyclic (pitch and roll) and pedals at a desired position.

49
Q

What is the minimum psi on the pressure gage for starting the APU?

A

2800 psi

50
Q

Where are both of the logic modules located?

A

Cabin Ceiling mounted in the left and right relay panels

51
Q

What components monitor reservoir fluid level switches on the hydraulic pump modules?

A

Hydraulic Logic Modules

52
Q

The LDI system uses _______ and _________ for monitoring hydraulic pump fluid level, and pump pressure for primary and tail rotor servos, and pilot assist servos.

A

Pressure switches

Fluid level sensors

53
Q

Step 1 in the Hydraulic Logic Module Operation Principle is handled by the __________.

A

Hydraulic Logic/LDI

54
Q

Step 2 in the Hydraulic Logic Module Operation Principle is handled by the __________.

A

Transfer Valve

55
Q

Step 3 in the Hydraulic Logic Module Operation Principle is handled by the __________.

A

Pilots Action

56
Q

Pilot Assist module has shutoff valves. What are they?

A

Trim, SAS and Boost

(Three stuid boxes)

57
Q

PRI SERVO PRESS, BOOST SERVO OFF Caution lights are usually associated with what type of malfunction?

A

Jams

58
Q

What is the final light to illuminate for a primary servo jam?

A

PRI SERVO PRESS

59
Q

The velocity fuse is located inside the__________.

A

Utility Module

60
Q

The velocity fuse is routed to the ____________.

A

APU ACCUMULATOR

61
Q

When the backup pump motor is powered by the main generators, it is depressurized to 700 psi for ____ sec.

A

1/2

62
Q

When the BACK UP RSVR LOW Light appears, the pilot must take what action?

A

Move the SVO OFF switch to isolate the leak and save the backup hyd pump

63
Q

Bank angles shall be limited to ______ degrees when a PRI SERVO PRESS caution appears

A

30 degrees

64
Q

When performing the tail rotor servo transfer check and the TAIL SERVO switch in BACKUP, the BACKUP PUMP ON should appear within how many seconds?

A

3 to 5

65
Q

A collective boost hardover will increase collective forces as much as _____ in the collective

A

150 lbs

66
Q

A yaw boost hardover will increase yaw forces as much as ____ in the pedals.

A

250 lbs

67
Q

A hardover failure of the pitch boost servo will increase the longitundal cyclic control forces approximately _____

A

20 lbs

68
Q

What does the Utility module do?

A

directs hydraulic pressure from the backup pump to No.1/No. 2 transfer module, 2nd stage tail rotor servo, and the APU accumulator

69
Q

What does the velocity fuse do?

A

shuts off hydraulic fluid to the accumulator if flow rate exceeds 1.5 gal/min

70
Q

If one or both cables fail, what caution appears?

A

TAIL ROTOR QUADRANT

71
Q

Trimmed flight is available at ________ KIAS.

A

25-145 Knots

72
Q

What are the two cautions that are not pressure cautions?

A

TRIM FAIL and FLT PATH STAB

73
Q

What advisory light indicates that correct timely action was taken?

A

BACKUP PUMP ON

UH60A/L Systems (9 decks)

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