DSC Autoflight Flashcards

1
Q

What is the low energy alert ?

A

Computed by the FAC.
Generate an aural low energy “SPEED SPEED SPEED” alert that repeat every 5sec.
=> warn crew of the need to increase thrust to regain positive flight path angle through pitch control.

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2
Q

When is the low energy alert available ?

A

in config 2,3 and FULL based on A/C config, horizontal deceleration and flight path angle

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3
Q

What is a good gross error check for calculating green dot ?

A

Neo a321 below 15000ft, 1,5x Weight in tonnes +110
Others below 20000ft 2x weight +85
FCOM DSC 22-10_50-20

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4
Q

Why can you have discrepancy between VAPP on the FMGC and the one displayed on PFD ?

A

It link to the way the GW is calculated.
The FAC will use FMS inserted gross weight initially but will computes its own based on aerodynamic data for the approach.

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5
Q

Can you explain the function of GS mini ?

A

The system ensures that the ground speed that the aircraft touches down with is maintained
throughout the approach, despite varying wind conditions.
It ensure standard aerodynamic margin VS stall

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6
Q

If you loose one FMGC what do you expect to see on the PFD and what impact on the ND ?

A

1FD1 or 2FD2
message on ND : SET OFFSIDE RNG/MODE or OFFSIDE FM control

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7
Q

What methods does the aircraft have to calculate its position ?

A

MIX IRS position
Computed radio position
GPS position

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8
Q

What is the aircraft FM position comprised of ?

A

Mix IRS and GPS position

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9
Q

With a loss FMGC how do you recover the radionavigation ?

A

Use the backup nav key on the RMP to manually tune radio nav.

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10
Q

For ALT planning, what assumptions are made regarding flight level and speed by the FMGC in terms of fuel brun ?

A

CI 0
FL100 if less than 100NM
FL220 if between 100NM-200NM

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11
Q

What is SRS ?

A

Speed reference system, control the speed via the elevator. => Adjust the pitch to maintain a speed
On takeoff target is V2+10

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12
Q

What are the protection associated with SRS ?

A
  • Flight path angle => Mini VS 120ft/min
  • Pitch angle protection => Reduce A/C nose up
  • Speed limiting => limiting target speed to V2+15kt
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13
Q

What is the two ENG operative range of the ATHR ? And single ENG ?

A

two : Idle to CLB
single: idle to MCT

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14
Q

With ATHR failure what FMA would you expect to see while in cruise ?

A

THR LCK

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15
Q

What is the guidance for selecting REV thrust if one THRUST Rev is inop ?

A

Select both

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16
Q

What is the max/min speed you can. set on the FCU ?

A

399-100/ Mach 0,10-0,99

17
Q

What is BUSS and why/when would you need it ?

A

Backup speed scale => alternative way of getting some speed info/ alt info
You would use it in case of unreliable Airspeed

18
Q

What data does the BUSS use ?

A

AoA and GPS for altitude

19
Q

What is the bird and where does it gets its data from ?

A

Show the track and flight path angle
Computed from IRS and static pressure

20
Q

What is Vref ?

A

reference speed for normal final approach
Vref = 1,23VS of config full

21
Q

What is Vapp ?

A

Vapp = VLS + Wind correction( min +5kt up to 15kt)

22
Q

What is Vls ?

A

lowest selectable speed, varies between 1,13VS during takeoff or 1,23VS to 1,28VS