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UH-60M Blackhawk - 2018 > Systems 2 - AFCS > Flashcards

Systems 2 - AFCS Flashcards

1
Q

AFCS is short for?

A

Automatic Flight Control System

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2
Q

SAS characteristics:

  • Dynamic/Static stability?
  • Short term/Long term?
  • Which axis?
  • Inner/Outer loop?
  • Slow/Fast reactions?
  • Amount of controll? (%)
  • What is the brain?
  • What is the muscles?
A

SAS characteristics:

  • Dynamic/Static stability?
  • Short term/Long term?
  • Which axis? - P/R/Y axis
  • Inner/Outer loop?
  • Slow/Fast reactions?
  • Amount of controll? Limited - 2x 5%
  • What is the brain? FCC #1 and #2
  • What is the muscles? P/R/Y SAS actuators
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3
Q

AFCS 5 subcomponents

A
  • stabilator
  • SAS
  • Trim
  • Flight path stabilation (FPS)
  • Flight director
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4
Q

FPS characteristics:

  • Dynamic/Static stability?
  • Short term/Long term?
  • Which axis?
  • Inner/Outer loop?
  • Slow/Fast reactions?
  • Amount of controll? (%)
  • What is the brain?
  • What is the muscles?
A

FPS characteristics:

  • Dynamic/Static stability?
  • Short term/Long term?
  • Which axis? - P/R/Y
  • Inner/Outer loop?
  • Slow/Fast reactions?
  • Amount of controll? Full - 100%
  • What is the brain? - FCC #1 and #2
  • What is the muscles? - P/R/Y Trim
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5
Q

What is an inner loop system? And what is different from outer loop system

A

A system that can provide changes to the rotorblades without changing the flight control positions

  • The outer loop system also makes changes to the rotorblades but at the same time changes the flight control positions
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6
Q

What are the five basic subsystems that comprise AFCS?

A

Stabilator, Trim, SAS, FPS, and Coupled FD.

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7
Q

What type of Stability is Static associated with, Short or Long Term?

A

Long Term

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8
Q

The Outer Loop is associated with which subsystem of AFCS?

A

Trim/FPS.

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9
Q

The FCCs get its P/R/Y information from where?

A

The EGIs

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10
Q

What are the stabilator functions?

A

*(SCALP)*

  • Streamlines at low airspeeds
  • Collective/Pitch coupling
  • Angle of incedence decreases with IAS increase
  • Lateral to sideslip pitch coupling
  • Pitch rate feedback
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11
Q

What are the stabilator Signals?

A

*(CLAP)*

  • Collective position
  • Lateral accelerometer
  • Airspeed
  • Pitch
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12
Q

What is the stabilitor system?

A

A system that drives a variable Angle of Incedence airfoil

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13
Q

What is the purpose of the stabilator system?

A

To provide stability in the pitch axis

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14
Q

What is the brains for the stabilator?

A

FCC #1 and #2

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15
Q

What is the Muscles of the stabilator?

A

1 and #2 stabilator actuator

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16
Q

Are the actuators in the stabilator eletric or hydraulic driven?

A

Electric driven by a Jackscrew motor

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17
Q

What is the function of the Position potentiometer

A

To signal the respective FCC what its stabilator actuator position currently is

18
Q

Where do the PFD get the stabilator position information from?

A

Position sensor / Positon transmitter and limit switch assembly

19
Q

NOTE

Use of the cyclic mounted stabilator slew up switch should be _____ to _____, to minimize cockpit confusion

A

NOTE

Use of the cyclic mounted stabilator slew up switch should be anounced to the crew, to minimize cockpit confusion

20
Q

When the stabilator is in Limited Auto Mode, what is the stabilator limited in?

A

Limited in

  • Range of motion
  • Speed
21
Q

What are the four signals used by the FCC’s to position the Stabilator?

A

Collective Stick Position

Lateral Accelerometers

Airspeed

Pitch rate

22
Q

What is the purpose of the stabilator?

A

Enhances handling qualities in the pitch axis in forward flight.

23
Q

What provides the FCCs with pitch rate information for the Stabilator?

A

The EGIs.

24
Q

What are the two cautions and one advisory associated with the Stabilator?

A

STAB MANUAL MODE

STAB UNLOCKED

STAB DEGRADED

25
Q

If you lost a P, R or Y signal to a FCC, what would happen to the SAS?

A

STAB DEG would appear if the other FCC still gets a signal

26
Q

What AFCS subcomponent enhances turn coordination above 50 KIAS?

A

SAS

27
Q

What are the five basic subsystems that comprise AFCS?

A

Stabilator, Trim, SAS, FPS, and Coupled FD

28
Q

Dynamic stability is provided by?

A

SAS

29
Q

Basic auto pilot functions are provided by?

A

Trim/FPS

30
Q

The _____caution indicates the majority of AFCS has shut down.

A

AFCS FAIL

31
Q

What does the SAS DEGRADED advisory mean?

A

The SAS pitch, roll, or yaw channel has disengaged

32
Q

What does the STAB DEGRADED advisory mean?

A

The stabilator is in a limited auto mode.

33
Q

To attempt to clear AFCS fault indications, the pilot can______.

A

press the illuminated CPTR 1 and/or CPTR 2 button

34
Q

The collective trim beeper can be used below 50 KIAS to ________?

A

change the aircraft heading

35
Q

(True/False) AFCS is considered a basic auto pilot?

A

TRUE

36
Q

What is a basic auto pilot?

A

Attitude hold

37
Q

What is required for proper SPS operation?

A
  • SAS 1 and/or SAS 2
  • TRIM
  • FPS
  • SAS/BOOST
38
Q

How does FPS know if you want HDG hold or TURN coorddination?

A
  • TRIM beeper is actuated in the lateral direciton
  • TRIM release switch is pressed and roll atittude is greater than 2.5 degrees
  • About 1⁄2 inch cyclic displacement and a roll attitude of about 1.0°.
  • Heading hold is automatically re-engaged and turn coordination disengaged upon recovery from the turn when the lateral stick force, roll attitude, and yaw rate are within prescribed limits.
  • Alternatively, the coupled FD is not engaged, the collective trim beeper may be used to establish a standard rate of turn.
39
Q

What does the FPS FAIL caut mean?

A

One or more of the FPS functions has disengaged due to a failure (pitch or roll attitude, heading hold, or turn coordination)

40
Q

Below 50 knots what is the FPSs function in the P/R/Y axis?

A
  • Pitch: Attitude hold
  • Roll: Attitude hold
  • Yaw: Heading hold
41
Q

Above 50 knots what is the FPSs function in the P/R/Y axis?

A
  • Pitch: Attitude Hold. Airspeed Hold is now a function of the flight director.
  • Roll: Attitude Hold
  • Yaw: Heading Hold /Turn Coordination

UH-60M Blackhawk - 2018 (20 decks)

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