DAFCS Flashcards
When flying with the Flight Director coupled, what happens to the Flight Director when the centering device release switch is pressed?
Momentarily disables the flight director coupling
What happens to the ILCAS if one DAFCS system fails?
single system boosted to 3/4 gain
The DAFCS stabilizes the helicopter about all axes and enhances control response; name five features provided by the DAFCS.
- 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
How do you momentarily disengage altitude hold when changing altitude?
Thrust Brake switch release at new altitude
When flying in known or forecast moderate or above turbulence, what are the three concerns/restrictions the pilots should be aware of?
Don’t use BALT hold,
make sure thrust brake operational,
MANUAL mode on LCT
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?
Yes, from the FD Select page
Which actuator makes the control input for positive stick gradient, pitch attitude, and airspeed hold purposes?
The DASH actuator
What is the status of the Heading Hold feature when the Swivel Lock Switch is not in the Locked position?
DAFCS Heading hold is disabled to prevent DAFCS from counteracting steering during ground taxi
Will the Longitudinal Cyclic Trim Actuators (LCT’s) function with the DAFCS switch in the off position?
Yes
With Position Hold (P Hold) captured (aircraft hovering), what happens to the status of P Hold when either weight-on-wheel engages?
PH is turned off
When flying in moderate turbulence or above should BARO ALT be engaged?
No
Which Control Layer must be selected to engage HDG (heading)?
Flight Director control layer
Which DAFCS Computer controls the radar and inertial altitude hold feature?
FCC 1
How do the flight control computers know to place the LCT actuators to the GRD position when in AUTO?
Both WOW Switches engaged signals DAFCS computers to drive LCT’s to GND
What should you do if the LCT actuators fail to position to GND during taxi, water, or slope operations?
Place LCT Switch to Manual
When accelerating from a hover, what is the max groundspeed which can be flown to remain within the Low Speed Regime?
20 KGS
At what groundspeed does the TRC feature become active or captured?
Between 0 and 9 KGS (Decelerated below 8 KGS)
Names two features of DAFCS that disengaged when the centering device release switch is depressed?
Bank angle hold, and heading hold
What are the three control laws (regimes) for the DAFCS?
Forward Flight
Low Speed
Ground
What is the maximum aircraft bank angle with altitude hold engaged?
45 Degrees
What is the maximum allowable airspeed when operating with both DAFCS OFF?
160 KCAS or VNE whichever is slower (disabled below 100 KCAS)
What is the maximum allowable airspeed when operating with a single DAFCS ON?
100 KCAS or VNE whichever is slower
What must be monitored to prevent transmission damage when changing airspeed or heading with altitude hold engaged?
Torque
Which Flight Control Computer controls the pitch CCDA?
FCC 2
At what groundspeed will the Low Speed Regime become active when decelerating?
16 KGS
What is the emergency procedure for a single AFCS failure with both systems on?
- 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.
- AFCS SEL switch — Isolate defective system. (select NO. 1 ON AFCS; if not isolated, select NO. 2 AFCS.)
If system is not isolated:
- AFCS SEL switch - OFF.
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?
Reverse “Hard-over”
What action is required to release the Thrust Magnetic brake?
Depress the Thrust Brake Switch
How will the aircraft react if DAFCS is turned off at one airspeed and back on at a different airspeed?
Pitch Transients (will adjust to go where it was turned off)
What will indicate that the DASH actuators are re-centering when DAFCS is first turned on?
DASH Caution Lights
Do not manually extend the LCT actuators beyond the GND position on the cyclic trim indicators at airspeeds below_________ KIAS.
60 KIAs
Describe one way you can change the aircraft bank angle without moving the cyclic?
AFCS Trim Switch or FD
Which mode of LCT operation should you select during flight in moderate or above turbulence?
Manual
What does the acronym CPT stands for?
Control Position Transducer
What does the acronym LVDT stands for?
Linear Variable Differential Transducer
What is the name of the portion of the Integrated Lower Control Actuator (ILCA) that is controlled by the DAFCS flight control computers (FCCs)?
Extensible link portion
How accurate is the DAFCS heading hold feature?
The DAFCS maintains heading within ±5° using inputs from the EGIs
When the landing gear proximity switches/WOW switches are activated, the DAFCS input into the pitch ILCA is reduced by what percent?
50%
What 3 DAFCS features are provided by the DASH actuator?
- Positive Stick Gradient
- Airspeed Hold
- Pitch Attitude Hold
Which Flight Control Computer controls the thrust CCDA?
FCC 1
At what groundspeed does the Position Hold feature become active or captured?
1 KGS or below
Is “Go Around” a DAFCS feature or a feature of the Flight Director?
Flight Director
When can radar altitude hold be used in forward flight?
Over water or known flat terrain (designed for hover)
Does the cyclic have to be centered for the cyclic to be in detent?
No
Should you allow the cyclic to move when the AFCS trim switch is moved forward or aft?
Yes
What is the name of the DAFCS component which the #1 Flight Control Computer (FCC), controls to provide the Altitude Hold feature?
Thrust CCDA
With Translational Rate Command (TRC) captured (aircraft hovering), what happens to the status of TRC when either weight-on-wheel switch engages?
Disengaged
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?
Move forward at 3 KGS
Should Baro altitude hold be used in moderate turbulence or above?
NO!!!
Can the aircraft take off without an operational Thrust Brake in forecast Moderate turbulence or above?
NO!!!
