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CH-47 academics exam 3 > DAFCS > Flashcards

DAFCS Flashcards

1
Q

When flying with the Flight Director coupled, what happens to the Flight Director when the centering device release switch is pressed?

A

Momentarily disables the flight director coupling

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2
Q

What happens to the ILCAS if one DAFCS system fails?

A

single system boosted to 3/4 gain

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3
Q

The DAFCS stabilizes the helicopter about all axes and enhances control response; name five features provided by the DAFCS.

A
  • Stability about all axes
  • Bank Angle Hold
  • Heading Hold
  • Airspeed Hold
  • Pitch Attitude Hold
  • Positive Stick Gradient
  • Attitude Command/Attitude Stability (ACAS)
  • Turn Coordination
  • Side Slip Stability
  • Altitude Hold
  • DAFCS Trim
  • Translational Rate Command (TRC)
  • Position Hold (PH)
  • Longitudinal Cyclic Trim (LCT) System
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4
Q

How do you momentarily disengage altitude hold when changing altitude?

A

Thrust Brake switch release at new altitude

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5
Q

When flying in known or forecast moderate or above turbulence, what are the three concerns/restrictions the pilots should be aware of?

A

Don’t use BALT hold,
make sure thrust brake operational,
MANUAL mode on LCT

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6
Q

With the Flight Director Coupled and HDG selected on the Flight Director Control Layer, can the pilot change the aircraft heading without touching the flight controls?

A

Yes, from the FD Select page

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7
Q

Which actuator makes the control input for positive stick gradient, pitch attitude, and airspeed hold purposes?

A

The DASH actuator

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8
Q

What is the status of the Heading Hold feature when the Swivel Lock Switch is not in the Locked position?

A

DAFCS Heading hold is disabled to prevent DAFCS from counteracting steering during ground taxi

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9
Q

Will the Longitudinal Cyclic Trim Actuators (LCT’s) function with the DAFCS switch in the off position?

A

Yes

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10
Q

With Position Hold (P Hold) captured (aircraft hovering), what happens to the status of P Hold when either weight-on-wheel engages?

A

PH is turned off

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11
Q

When flying in moderate turbulence or above should BARO ALT be engaged?

A

No

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12
Q

Which Control Layer must be selected to engage HDG (heading)?

A

Flight Director control layer

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13
Q

Which DAFCS Computer controls the radar and inertial altitude hold feature?

A

FCC 1

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14
Q

How do the flight control computers know to place the LCT actuators to the GRD position when in AUTO?

A

Both WOW Switches engaged signals DAFCS computers to drive LCT’s to GND

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15
Q

What should you do if the LCT actuators fail to position to GND during taxi, water, or slope operations?

A

Place LCT Switch to Manual

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16
Q

When accelerating from a hover, what is the max groundspeed which can be flown to remain within the Low Speed Regime?

A

20 KGS

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17
Q

At what groundspeed does the TRC feature become active or captured?

A

Between 0 and 9 KGS (Decelerated below 8 KGS)

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18
Q

Names two features of DAFCS that disengaged when the centering device release switch is depressed?

A

Bank angle hold, and heading hold

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19
Q

What are the three control laws (regimes) for the DAFCS?

A

Forward Flight
Low Speed
Ground

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20
Q

What is the maximum aircraft bank angle with altitude hold engaged?

A

45 Degrees

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21
Q

What is the maximum allowable airspeed when operating with both DAFCS OFF?

A

160 KCAS or VNE whichever is slower (disabled below 100 KCAS)

22
Q

What is the maximum allowable airspeed when operating with a single DAFCS ON?

A

100 KCAS or VNE whichever is slower

23
Q

What must be monitored to prevent transmission damage when changing airspeed or heading with altitude hold engaged?

A

Torque

24
Q

Which Flight Control Computer controls the pitch CCDA?

A

FCC 2

25
Q

At what groundspeed will the Low Speed Regime become active when decelerating?

A

16 KGS

26
Q

What is the emergency procedure for a single AFCS failure with both systems on?

A
  1. A/S — Below 100 KCAS or Vne, whichever is slower.

​2. Altitude — Adjust as required.

​​NOTE
A hardover in the opposite direction may occur when the malfunctioning AFCS is turned off and the functioning AFCS reacts on the flight controls.

  1. AFCS SEL switch — Isolate defective system. (select NO. 1 ON AFCS; if not isolated, select ​NO. 2 AFCS.)

If system is not isolated:

  1. AFCS SEL switch - OFF.
27
Q

If you have a hard-over with both DAFCS on, how will you know when you have the good system selected on and the malfunctioning system off?

A

Reverse “Hard-over”

28
Q

What action is required to release the Thrust Magnetic brake?

A

Depress the Thrust Brake Switch

29
Q

How will the aircraft react if DAFCS is turned off at one airspeed and back on at a different airspeed?

A

Pitch Transients (will adjust to go where it was turned off)

30
Q

What will indicate that the DASH actuators are re-centering when DAFCS is first turned on?

A

DASH Caution Lights

31
Q

Do not manually extend the LCT actuators beyond the GND position on the cyclic trim indicators at airspeeds below_________ KIAS.

A

60 KIAs

32
Q

Describe one way you can change the aircraft bank angle without moving the cyclic?

A

AFCS Trim Switch or FD

33
Q

Which mode of LCT operation should you select during flight in moderate or above turbulence?

A

Manual

34
Q

What does the acronym CPT stands for?

A

Control Position Transducer

35
Q

What does the acronym LVDT stands for?

A

Linear Variable Differential Transducer

36
Q

What is the name of the portion of the Integrated Lower Control Actuator (ILCA) that is controlled by the DAFCS flight control computers (FCCs)?

A

Extensible link portion

37
Q

How accurate is the DAFCS heading hold feature?

A

The DAFCS maintains heading within ±5° using inputs from the EGIs

38
Q

When the landing gear proximity switches/WOW switches are activated, the DAFCS input into the pitch ILCA is reduced by what percent?

A

50%

39
Q

What 3 DAFCS features are provided by the DASH actuator?

A
  • Positive Stick Gradient
  • Airspeed Hold
  • Pitch Attitude Hold
40
Q

Which Flight Control Computer controls the thrust CCDA?

A

FCC 1

41
Q

At what groundspeed does the Position Hold feature become active or captured?

A

1 KGS or below

42
Q

Is “Go Around” a DAFCS feature or a feature of the Flight Director?

A

Flight Director

43
Q

When can radar altitude hold be used in forward flight?

A

Over water or known flat terrain (designed for hover)

44
Q

Does the cyclic have to be centered for the cyclic to be in detent?

A

No

45
Q

Should you allow the cyclic to move when the AFCS trim switch is moved forward or aft?

A

Yes

46
Q

What is the name of the DAFCS component which the #1 Flight Control Computer (FCC), controls to provide the Altitude Hold feature?

A

Thrust CCDA

47
Q

With Translational Rate Command (TRC) captured (aircraft hovering), what happens to the status of TRC when either weight-on-wheel switch engages?

A

Disengaged

48
Q

With the aircraft at a hover and Translational Rate Command (TRC) captured, what will occur if the DAFCS Trim Switch is beeped forward 3 times?

A

Move forward at 3 KGS

49
Q

Should Baro altitude hold be used in moderate turbulence or above?

A

NO!!!

50
Q

Can the aircraft take off without an operational Thrust Brake in forecast Moderate turbulence or above?

A

NO!!!

CH-47 academics exam 3 (5 decks)

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