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Allegiant Airbus > *Auto Flight > Flashcards

*Auto Flight Flashcards

1
Q

What are the main components of the FMGS?
4

A

-2 FMGCs
-2 MCDUs
-2 FACs
-1 FCU

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2
Q

What are the functions of the FMGC?

A

Flight guidance and flight management

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3
Q

What are the 3 modes of FMGC operation?

A

-Dual (normal)
-Single (ND displays “SELECT OFFSIDE RNG/MODE”)
-Indipendent (MCDU scratchpad displays “INDIPENDENT OPERATION”

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4
Q

What are the 2 modes of flight guidance, and what are they used for?
Which one has priority?

A

-Manage. Used for long term lateral, vertical, and speed profiles as determined by the FMGS.
-Selected. Temporary lateral and vertical and speed commands as selected on the FCU.
-Selected has priority.

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5
Q

How do you determine the validity of the navigation database?

A

Aircraft Status page via the MCDU

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6
Q

What input does each FMGC use for position determination?

A

A mix of IRS/GPS position.

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7
Q

How does autopilot selection influence master FMGC logic?

A

-If one autopilot on, the respective FMGC is master.
-If both APs on, FMGC 1 is master.

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8
Q

If an amber “SELECT OFFSIDE RNG/MODE” message is displayed on the ND, what action should the crew take?

A

An FMGC has failed, and both NDs must be set to the same range and mode.

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9
Q

Can both APs be engaged during any phase of flight?

A

No, ILS only.

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10
Q

What is the difference between the small and large fonts on the MCDU?

A

Large-Pilot entries and modifiable data.
Small-Default/computed non-modifiable data.

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11
Q

What is the function of the FCU?

A

-Permits short term interface between the pilot and the FMGS.
-Allows temporary modification of any flight parameter (HDG, SPD, ALT, V/S).
-Used to select operational modes of the autopilots, FDs, and A/THR system.

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12
Q

Will the Altitude window on the FCU ever display dashes?

A

NO. Pilot selected altitudes will always be displayed.

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13
Q

How is the crew made aware of mode changes on the FMA?

A

A white box is temporarily displayed around the new indication.

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14
Q

How are armed modes displayed on the FMA?

A

Blue- Armed
Magenta-Armed because of constraint
Green- Engaged

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15
Q

When is the sidestick position indication icon (white cross) displayed?

A

Displayed after first engine start
Disappear at lift off.

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15
Q

What do the large red arrows indicate?

A

Pitch attitude of >30 deg.

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16
Q

What is the meaning of USE MANUAL PITCH TRIM?

A

You are in DIRECT LAW.

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17
Q

What is the use MAN PITCH TRIM ONLY?

A

You are in Mechanical Back up.

18
Q

What are pitch and roll angle limits indicated by a green = sign?

A

Pitch +30 deg up/-15 deg down.
Roll +/- 67 deg.

19
Q

How can you determine when you are in Alternate Law?

A

Amber XXs replace the green = marks at the pitch and bank limits.
Only VLS and VSW are displayed on the airspeed scale.

20
Q

When would the sideslip index change from yellow to blue?

A

In case of an engine failure during takeoff roll/go around, it is now a blue beta target.

21
Q

What is the difference between BLUE and MAGENTA target airspeed?

A

Blue- Selected speed on the FCU.
Magenta-Managed speed computed by the FMGC.

22
Q

What speed does Vmax represent and how is it displayed?

A

It is the lowest of Vmo/Mmo, Vle, or Vfe.
Defined by the bottom of the red and black strip along the speed scale.

23
Q

What is Vls?

A

-Represent the lowest selectable speed providing an appropriate margin to the stall speed.
-Correspond to 1.3 Vs during takeoff.
-1.23 Vs after retraction of one step of flaps.
-1.28 Vs in clean configuration.
-Above 20000’, Vls is corrected for Mach effect to maintain a buffet margin of 0.2g.
-In approach mode is equivalent to Vref
-Increases with speedbrake extension.

24
Q

What is Green Dot speed?

A

Engine out operating speed in clean config.
Appears when the aircraft is in clean config.
Correspond to L/D max.

25
Q

What is Ground Speed Mini?

A

-Based on a calculated ground speed at the runway.
-Protects against actual groundspeed dropping below this calculated ground speed.

26
Q

What does it mean when you see the magenta target airspeed triangle above Vapp on approach?

A

Ground Speed Mini, has increased speed due to a higher headwind component at your present location than what was calculated at the runway.

27
Q

Is GS mini protection available in selected speed?

A

No-Managed speed only.

28
Q

What are 3 ways to disconnect the A/THR?

A

Instinctive Disconnect Buttons
Thrust Levers to idle
A/THR pushbutton (not recommended)

29
Q

How do you disconnect the A/THR for the remainder of the flight?

A

Press and hold the Instinctive Disconnect Buttons for 15 seconds.

30
Q

What would you lose if you held down the Instinctive Disconnect Buttons for more than 15 seconds?

A

Alpha Floor Protection.

31
Q

What happens to thrust and WHAT annunciates on the FMA when you reach Alpha Floor?

A

Thrust-TOGA
FMA- A. FLOOR

32
Q

What occurs during A. Floor protection after speed increases above Vls?

A

FMA changes to TOGA LK.

33
Q

How do you regain normal A/THR when in TOGA LK?

A

Move thrust levers to TOGA detent
Press the Instinctive Disconnect button
Return the Thrust Levers to CL detent
Push the A/THR button to engage A/THR.

34
Q

When is A. Floor active?

A

From lift-off to 100’ RA on approach.

35
Q

When would Thrust Lock occur?

A

-Thrust Levers in CL detent and A/THR pb on the FCU pushed, or
-A/THR disconnects due to a failure.

36
Q

Where do you enter ZFW?

A

INIT B page (not accessible after engine start)

37
Q

What do amber box prompts on the MCDU indicate?

A

An entry is mandatory.

38
Q

What occurs when managed NAV mode is engaged and the aircraft flies into a flight plan discontinuity?

A

NAV mode is lost and HDG/TRK mode engaged.

39
Q

What do dashes in the FCU display windows along with the adjacent white dot indicate?

A

FMGS Managed Guidance is in use.

40
Q

How is Selected Guidance engaged?

A

Pull the appropriate selector knob.

41
Q

How do you confirm all autopilot, FD, and A/THR inputs?

A

Reference the FMA.

42
Q

What does each column mean on the PFD?

A

A/THR, VERTICAL, LATERAL, APP CAPABILITIES, DH/MDA, AP, FD, A/THR ENGAGEMENT STATUS

Allegiant Airbus (55 decks)

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