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Airbus A220-300 > Flight controls > Flashcards

Flight controls Flashcards

1
Q

What flight controls does the FBW system control?

A

All primary and secondary flight controls with exceptions from flaps and slats.

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2
Q

What are the two FBW modes?

A

Normal or direct mode

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3
Q

How many channels does the FBW system consist of?

A

Three.

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4
Q

What is the primary source of power for the FBW system?

A

The three different channels are powered by the DC busses.

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5
Q

What is the secondary source of power for the FBW system?

A

The PMAG.

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6
Q

What are

IIM

PFCC

REU

AFCU

?

A

IMM = Inceptor Interface Module

PFCC = Primary Flight Control Computer

REU = Remote Electronic Unit

AFCU = Alternate Flight Control Unit

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7
Q

What is the function of the IIM’s?

A

Receives inputs from flight deck and transmits to PFCC’s.

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8
Q

What is the function of he PFCC’s?

A

They are responsible for the operation of the FBW system and associated functions. hey receive signals from the IIM’sor AFCS/FDS och commands movement of the flight control surfaces.

They also provide flight envelope and structural protection.

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9
Q

How many PFCC’s controls the FBW system?

A

One at a time.

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10
Q

PFCC’s receive data input from?

A

IRS’s and ADSP’s

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11
Q

What is the function of the REU’s?

A

They transmit commands to the PCU’s from the PFCC.

Two REU’s transmit commands to the horizontal stabilizer’s electric trim motors.

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12
Q

What happens if a PFCC fails?

A

The REU’s receive signals directly from the IIM’s.

This is called REU direct mode.

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13
Q

What happens if the FBW system i severly degraded?

A

The AFCU bypasses the REU’s.

There will be direct interface between flight deck controls and stabilizer, and ne PCU in each aileron, elevator and rudder. This is AFCU direct mode.

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14
Q

How does speed stability use pitch in normal mode?

A

It uses pitch to maintain selected trim speed.

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15
Q

What system controls the auto stabilizer trim mode?

A

The FBW system.

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16
Q

At what bank angle does the crew need to compensate with pitch during a turn?

A

Above 33 degree bank.

17
Q

Describe the Nose Landing Gear Loading function.

A

On ground, when TL above 24 deg, causes elevetor to deflect to a nose down position.

It’s active up to 80 KTS and inactive at 90 KTS.

18
Q

When does ground mode occur?

A

It’s dictated by a combination of RA, weight on wheels and wheel speed.

19
Q

When is ground to air transition complete?

A

3 seconds after aircraft is airborne.

20
Q

How are airspeed and rudder travel related?

A

Higher airspeed, less rudder travel.

Lower airspeed, more rudder travel.

21
Q

At what altitude does the half bank limit become visible?

A

31 500’

22
Q

What does the wing maneuver load alleviation function do?

A

Reduces wing root bending and structural weight by deflecting the ailerons upward during positive load factor maneuvers.

23
Q

What is the engine out compensation function?

A

Provides partial automatic yaw compensation in flight engine failure.

24
Q

What are the three types of direct mode?

A

PFCC

REU

AFCU

25
Q

What visual indications would you receive if the aircraft reverts to direct mode?

A

Amber FLT CTRL DIRECT message on the EICAS

DIRECT displays in amber in the upper left hand corner of PFD

26
Q

When does the aircraft revert to REU direct mode?

A

When all PFCC’s have failed or all signals to the REU’s are lost.

27
Q

What do you lose functionality wise between PFCC direct and REU direct?

A

Sidestick priority

Ground spoilers

Multifunction spoilers must be deployed manually

Pitch trim rate is slower

28
Q

When does the the FBW system revert to AFCU direct mode?

A

When control requirement is lost due to multiple REU failures.

29
Q

What visual messages display in case of reversion to AFCU direct mode?

A

Red DIRECT message in upper left corner of PFD.

FLT CTRL DIRECT warning message on EICAS

30
Q

What control functions are available during AFCU Direct mode?

A

Manual HSTAB Trim

Rudder trim

Manual aileron trim

31
Q

What hydraulic systems power the ailerons?

A

The #2 and #3 hydraulic systems power a PCU each per aileron.

32
Q

If FBW is operating in AFCU direct mode, how are ailerons powered?

A

Via AFCU using hydraulic system #3

Airbus A220-300 (10 decks)

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