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CH-47F 9.4 Bham > DAFCS > Flashcards

DAFCS Flashcards

1
Q

Define DAFCS

A

Digital advanced flight control system

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2
Q

How do you momentarily disengage altitude hold when changing altitude?

A

Thrust brake switch

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3
Q

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

A

LCT’s must be in manual, operating thrust break, do not use barometric altitude hold

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4
Q

Will the cyclic move when the DAFCS trim switch is moved laterally?

A

No

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5
Q

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

A

DASH- differential airspeed hold

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6
Q

Will the LCTs function with the DAFCS switch in the off position?

A

Yes

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7
Q

What is the name of the DAFCS component which the #1 FCC controls to provide the altitude hold feature?

A

Thrust CCDA (Collective Cockpit Control Driver Actuator)

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8
Q

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

A

FCC #1

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9
Q

At what ground speed does TRC capture?

A

<9 KGS

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10
Q

What two features of DAFCS disengages when the centering device release which is pressed?

A

Bank angle hold, heading hold

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11
Q

What are the three control laws (regimes)?

A

Flight regime, low speed regime, ground regime

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12
Q

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

A

45° Roll
30° pitch

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13
Q

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

A

TQ, thrust control inputs

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14
Q

Which fight control computer (FCC) controls the pitch CCDA?

A

2 FCC

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15
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

Erroneous inputs to flight controls will continue until The healthy system is selected

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16
Q

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

A

Pitch transients

Possible DASH 1/2 failure as it reprograms/adjusts

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17
Q

What visual indication will you see when the DASH actuators are re-centering when DFCS is first turned on?

A

DASH1 and/or DASH2 FAIL caution

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18
Q

Define CPT

A

Control position transducer

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19
Q

Define LVDT

A

Linear variable differential transducer

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20
Q

What portion of the ILCA’s are controlled by the DAFCS flight control computers?

A

Extensible links portion

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21
Q

How accurate is the DAFCS heading hold feature?

A

+/-3 degrees

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22
Q

When the landing gear WOW/proximity switches are activated, the DAFCS input into the pitch ILCA is reduced by what percent? How does this help the pilot control the acft

A

-50%
-During two-wheel taxi, this helps prevent the porpoising of the aircraft

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23
Q

What 3 DAFCS features are provided by the DASH actuator?

A

Airspeed hold above 40 kts, pitch attitude hold below 40 knots, positive cyclic stick gradient

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24
Q

Which flight control computer (FCC) controls the thrust CCDA?

A

1FCC

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25
Q

At what groundspeed does the position hold feature become active or captured?

A

Below 1KGS

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26
Q

Is go around a DAFCS feature or a feature of the flight director?

A

Flight Director

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27
Q

When can radar altitude hold be used in forward flight?

A

Over water or known flat ground

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28
Q

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

A

No

29
Q

At what airspeeds (accelerating and decelerating) is the low speed regime active?

A

Aircraft has not Accelerated past 45 KCAS
-or-
Aircraft decelerates below 35 KCAS

30
Q

Above what airspeed can LEVEL (Roll Wings Level Mode) be activated?

A

45 knots

31
Q

Under what 2 conditions will ALT-RAD automatically switch to ALTINRT?

A

The aircraft climbs above 8000’ AGL or the radar altimeter fails for more than 2 seconds

32
Q

Held presses of the UP/DOWN sw on the Thrust Control Grip commands an altitude change rate of what?

A

200 ft/min (3.33 ft/sec)

33
Q

ALT-INRT may allow the aircraft to drift above or below the reference altitude at a rate of _______ /min or ______ /min when GPS aiding is off without any corresponding annunciation.

A

5 ft per minute
-or-
15 feet per minute

34
Q

How does DAFCS provide torque limiting for DAFCS altitude hold and vertical axis coupled modes to prevent overtorque, exceeding engine limitations and to prevent rotor droop?

A

-maintains dual engine torque below 96%
-maintains the higher of the two engines below 10 minute limit (899 • Celsius)
-keeps dual engine torque above 14% to prevent spray clutch disengagement

torque limiting will not lower the thrust of radar altitude is less than 100’ AGL

35
Q

DESCENT mode will descend the aircraft at approximately ___ degrees and rates of descent no more than approximately _____ fpm until termination at a hover flight condition at a minimum height of ___ feet AGL.

A

9 degrees

600 fpm

20 feet AGL

36
Q

At gross weights above 42,400lbs with BALT mode engaged, bank angles greater than ___degrees results in large uncommanded pitch attitude and airspeed deviations.

A

22 degrees

At night or in IMC flight, this may cause the pilot to become spatially disoriented

37
Q

When groundspeed is less than ____ knots and the hover hold mode is activated, the current ground track, speed, radar altitude, and track angle will be maintained.

A

40 knots ground

38
Q

DECEL/PSN Hold can be armed at any speed but will be activated only below _____ knots ground speed and remain active up to ____knots ground speed.

A

65 knots ground

70 knots ground

39
Q

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

A

Acft will move at 3kgs

40
Q
A

Flight Control Computers (FCC)

41
Q

What sensors supply information to the Flight Control Computers

A

EGIs (Embedded Global Positioning/Inertial Navigation System, Pitot Static system and ADC’s, Radar Atimeter, WOW switches and Power Steering Control Box, Control Position Transducers

42
Q

What conditions must be met for VEL HOLD mode to operate

A

-it’s armed
-acft airborne
-below 35 KGS
-CDR button not pressed
-DASH is in normal rate mode

43
Q

What airspeed does Forward Flight Velocity Mode (roll wings level mode) activate

A

above 40 KGS

44
Q

What airspeed does Descent mode activate

A

below 65 KGS

45
Q

What component does DAFCS work with to maintain pitch attitude hold below 40 KCAS

A

DASH

46
Q

Name features provided by DAFCS

A

-Attitude Hold
-velocity
-PSN Hold
-Decel
-Descent Mode
-Bank Angle Hold
-heading Hold
-attitude command/altitude hold ACAH
-Automatic LCT Operation

47
Q

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

A

the FCC’s disengage Heading Hold

48
Q

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

A

Both weight on wheels/proximity switches must be engaged

49
Q

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

A

45 knos A/S
-Turns off when accelerating beyond 45 KGS
-Turns on when decelerating below 35 KGS

50
Q

At what GS decelerating does the VEL feature become active/captured

A

35 KGS

51
Q

Name the features of DAFCS that disengage when the CDR switch is depressed

A

VEL, PSN HOLD, DECEL, Descent Mode, Bank Angle Hold, Heading Hold, Attitude Command/Attitude Hold (ACAH)

52
Q

What must be monitored to prevent transmission damage when changing A/S or hdg with attitude hold engaged

A

Monitor TQ

53
Q

What groundspeed does the Low Speed Regime become active when decelerating

A

35 knts

54
Q

What visual indication will you see when the DASH actuators are re-centering when DAFCS is first turned on

A

Possible DASH 1/2 failure as it reprograms/adjusts

55
Q

Is “Go Around” a DAFCS feature or a Flight Director feature

A

Flight Director Feature

56
Q

should you allow the cyclic to move when the DAFCS trim switch is moved forward or aft

A

yes

57
Q

what are 2 groundspeed-based “velocity stabilized” pilot-selectable modes

A

Velocity Hold mode and Decel/PSN Hold mode

58
Q

What action shold the pilot take to select Radar Altitude Hold

A

-in DAFCS mode select Radar Alt Hold by selecting ALT twice on TCL
-In FD, the pilot must select the MFD key to RALT on FD control layer

59
Q

Holding the AFCS Trim Sw produces a fixed translational rate of ____ fps (3 knots) in the direction of actuation. Bank angle hold will not reengage until the roll rate is less than ___ °/second

A

5 fps
1.5°/sec

60
Q

Roll Wings Level Mode (LEVEL) can be selected when the aircraft is traveling greater than ___ knots forward groundspeed

A

45 KGS

61
Q

Altitude hold will level-off and capture a new reference when the vertical velocity is less than ___ fpm

A

25 fpm

62
Q

the RETRIM REQUEST Advisory is active when either the roll or yaw ILCA is using more than 40/50% of its avail authority for trim. The pilot should re-trim the controls with the ___ switch to allow the actuators to re-center

A

CD REL

63
Q

Will the cyclic move when the DAFCS trim switch is moved laterally

A

No

64
Q

With VEL captured (hovering), what happens to the status of VEL when either WOW sw engages

A

it is disabled

65
Q

What should be done if the LCT actuators fail to position to GND during taxi, water, or slope operations

A

Select MANUAL on the LCT panel and adjust them manually

66
Q

Do not manually extend the LCT actuators beyond the GND position on the cyclic trim indicators at airspeeds below _____ KCAS

A

60 KCAS

67
Q

One way you can change the aircraft bank angle without moving the cyclic

A

lateral movement of the DAFCS trim sw

68
Q

With the aircraft at a hover and VEL captured, what will occur if the DAFCS Trim Switch is beeped forward 3 times

A

Acft will move at 3 KGS

CH-47F 9.4 Bham (48 decks)

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