DAFCS

Question 1

Define DAFCS

Answer 1

Digital advanced flight control system

Question 2

How do you momentarily disengage altitude hold when changing altitude?

Answer 2

Thrust brake switch

Question 3

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

Answer 3

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

Question 4

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

Answer 4

No

Question 5

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

Answer 5

DASH- differential airspeed hold

Question 6

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

Answer 6

Yes

Question 7

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

Answer 7

Thrust CCDA (Collective Cockpit Control Driver Actuator)

Question 8

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

Answer 8

FCC #1

Question 9

At what ground speed does TRC capture?

Answer 9

<9 KGS

Question 10

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

Answer 10

Bank angle hold, heading hold

Question 11

What are the three control laws (regimes)?

Answer 11

Flight regime, low speed regime, ground regime

Question 12

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

Answer 12

45° Roll
30° pitch

Question 13

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

Answer 13

TQ, thrust control inputs

Question 14

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

Answer 14

2 FCC

Question 15

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?

Answer 15

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

Question 16

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

Answer 16

Pitch transients

Possible DASH 1/2 failure as it reprograms/adjusts

Question 17

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

Answer 17

DASH1 and/or DASH2 FAIL caution

Question 18

Define CPT

Answer 18

Control position transducer

Question 19

Define LVDT

Answer 19

Linear variable differential transducer

Question 20

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

Answer 20

Extensible links portion

Question 21

How accurate is the DAFCS heading hold feature?

Answer 21

+/-3 degrees

Question 22

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

Answer 22

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

Question 23

What 3 DAFCS features are provided by the DASH actuator?

Answer 23

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

Question 24

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

Answer 24

1FCC

Question 25

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

Answer 25

Below 1KGS

Question 26

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

Answer 26

Flight Director

Question 27

When can radar altitude hold be used in forward flight?

Answer 27

Over water or known flat ground

Question 28

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

Answer 28

No

Question 29

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

Answer 29

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

Question 30

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

Answer 30

45 knots

Question 31

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

Answer 31

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

Question 32

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

Answer 32

200 ft/min (3.33 ft/sec)

Question 33

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.

Answer 33

5 ft per minute -or- 15 feet per minute

Question 34

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?

Answer 34

-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*

Question 35

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.

Answer 35

9 degrees 600 fpm 20 feet AGL

Question 36

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

Answer 36

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

Question 37

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.

Answer 37

40 knots ground

Question 38

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.

Answer 38

65 knots ground 70 knots ground

Question 39

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

Answer 39

Acft will move at 3kgs

Question 40

Answer 40

Flight Control Computers (FCC)

Question 41

What sensors supply information to the Flight Control Computers

Answer 41

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

Question 42

What conditions must be met for VEL HOLD mode to operate

Answer 42

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

Question 43

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

Answer 43

above 40 KGS

Question 44

What airspeed does Descent mode activate

Answer 44

below 65 KGS

Question 45

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

Answer 45

DASH

Question 46

Name features provided by DAFCS

Answer 46

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

Question 47

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

Answer 47

the FCC's disengage Heading Hold

Question 48

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

Answer 48

Both weight on wheels/proximity switches must be engaged

Question 49

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

Answer 49

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

Question 50

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

Answer 50

35 KGS

Question 51

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

Answer 51

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

Question 52

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

Answer 52

Monitor TQ

Question 53

What groundspeed does the Low Speed Regime become active when decelerating

Answer 53

35 knts

Question 54

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

Answer 54

Possible DASH 1/2 failure as it reprograms/adjusts

Question 55

Is "Go Around" a DAFCS feature or a Flight Director feature

Answer 55

Flight Director Feature

Question 56

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

Answer 56

yes

Question 57

what are 2 groundspeed-based "velocity stabilized" pilot-selectable modes

Answer 57

Velocity Hold mode and Decel/PSN Hold mode

Question 58

What action shold the pilot take to select Radar Altitude Hold

Answer 58

-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

Question 59

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

Answer 59

5 fps 1.5°/sec

Question 60

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

Answer 60

45 KGS

Question 61

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

Answer 61

25 fpm

Question 62

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

Answer 62

CD REL

Question 63

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

Answer 63

No

Question 64

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

Answer 64

it is disabled

Question 65

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

Answer 65

Select MANUAL on the LCT panel and adjust them manually

Question 66

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

Answer 66

60 KCAS

Question 67

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

Answer 67

lateral movement of the DAFCS trim sw

Question 68

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

Answer 68

Acft will move at 3 KGS