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COAS 2022 > 27 Flight Controls > Flashcards

27 Flight Controls Flashcards

1
Q

Which spoilers are used for roll control?

A

2, 3, 4 and 5

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2
Q

Which spoilers are used as speed brakes?

A

2, 3 and 4

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3
Q

What is an ELAC and how many are there?

A

Elevator and Aileron Computer, x2

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4
Q

What is a SEC and how many are there?

A

Spoiler Elevator Computer, x3

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5
Q

Which hydraulic system supplies which spoiler?

A

Spoiler: 1 2 3 4 5
System: G Y B Y G

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6
Q

Which hydraulic systems supply the ailerons?

A

Left Aileron: Blue and Green
Right Aileron: Green and Blue

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7
Q

Which hydraulic systems supply the elevators?

A

Left elevator: Blue and Green
Right elevator: Yellow and Blue

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8
Q

Which hydraulic systems supply the stabiliser? (Pitch trim)

A

Green and Yellow

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9
Q

Which hydraulic systems supply the rudder?

A

Green, Blue and Yellow

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10
Q

Which SEC supplies which spoiler?

A

Left Spoilers: 5 4 3 2 1
SECs: 2 1 1 3 3

Right Spoilers: 1 2 3 4 5
SECs 3 3 1 1 2

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11
Q

What is aileron droop? How is it displayed on the F/CTL SD page?

A

This uses the ailerons as a form of flaps to increase the lift generated by the wings at low speed. This droop is 5 degrees on the A319/A320 and 10 degrees on the A321.

It is showed by the arrow pointing to a small box in the middle of the aileron position indicator (not between the two dashes indicating clean neutral position) on the F/CTL SD page

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12
Q

What do the ELACs control?

A

Normal elevator and stabiliser control
Ailerons

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13
Q

What do the SECs control?

A

Spoiler control
Standby elevator and stabiliser control

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14
Q

What does FAC stand for and what does it do?

A

Flight Augmentation Computer (x2)

Controls rudder, rudder trim, and yaw damper inputs. It computes data for the flight envelope and speed functions. It also provides warning for low-energy and windshear detection.

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15
Q

What is an FCDC?

A

Flight Control Data Concentrator (x2)

Acquires data from the ELACs and the SECs and sends it to the Electronic Instrument System (EIS) and the Centralised Fault Display System (CFDS)

MEL FCDC 1… no dispatch

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16
Q

At what speed do ground spoilers auto extend in an RTO?

A

72kts

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17
Q

Which system takes over to control elevators and the stabiliser if ELAC 2 fails?

A

ELAC 1, then if that fails, the SECs

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18
Q

Which system takes over to control the ailerons if ELAC 1 fails?

A

ELAC 2, then they become damped

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19
Q

What is an SFCC? What does it do?

A

Slat Flap Control Computer (x2)

If one SFCC is inoperative, slats and flaps both operate at half speed.

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20
Q

If slat wing tip brakes (WTBs) are on, can you control the flaps? What about vice versa?

A

Yes, and yes

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21
Q

What is alpha lock and how does it work?

A

It inhibits slat retraction at high angles of attack or low speeds

AOA > 8.5 degrees or speed < 148kts

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22
Q

What is the altitude limitation on the slats and flaps?

A

20000ft

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23
Q

What does it mean if a hydraulic system is shown in amber on the F/CTL SD page?

A

Low hydraulic pressure

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24
Q

What happens if speed brakes are extended and you select TOGA?

A

They automatically retract and remain retracted until the inhibition condition disappears and the pilot resets the lever.

(The speed brakes can be extended again 10 seconds or more after the level is reset)

FCOM 27-10-20

25
Q

What happens if a speed brake inhibition condition arises whilst the speed brakes are extended? What are some of these conditions?

A

They automatically retract and remain retracted until the inhibition condition disappears and the pilot resets the lever.

(The speed brakes can be extended again 10 seconds or more after the lever is reset)

These conditions include Flaps FULL, thrust levers above MCT, alpha floor activation, L or R elevator fault, SEC1+3 fault

FCOM 27-10-20

26
Q

Which computer controls the left and right ailerons? And through which hydraulic system?

A

Left aileron controlled by ELAC 1 through blue hydraulics, and ELAC 2 through green hydraulics as a backup.
BG12

Right aileron controlled by ELAC 1 through green hydraulics, and ELAC 2 through blue hydraulics as backup.
GB12

FCOM 27-10-20

27
Q

How many electrical motors control the trimmable horizontal stabiliser (THS) hydraulic motors?

A

3 electrical motors control the 2 hydraulic motors (Green and Yellow)

28
Q

In normal operation, which ELAC controls which electrical motor on the THS?

A

ELAC 2 controls electrical motor 1

29
Q

When is mechanical control of the THS available from the pitch trim wheel?

A

At any time when either the green or yellow hydraulic system is operating

(G+Y hydraulic failure? Only blue left? THS is frozen ❄️)

FCOM 27-10-20

30
Q

What has priority over controlling the THS; mechanical control or electrical control?

A

Mechanical control (from the pitch trim wheel)

31
Q

How many electrical-controlled hydraulic servojacks control each elevator?

A

Two

(Left: B and G
Right: Y and B)

32
Q

How many control modes are there of the servojacks operating the elevators? What are these modes?

A

3

Active: jack position electrically-controlled
Damping: jack follows surface movement
Centering: jack hydraulically retained in neutral

33
Q

In normal operation, which control modes do the elevator servojacks operate in?

A

One jack is in active mode, one jack is in damping mode (some manoeuvres may cause second jack to become active)

34
Q

How many flap surfaces are there?

A

2

35
Q

How many slat surfaces are there?

A

5

36
Q

Which slats are are wing anti-iced?

A

The three outboard slats (3, 4, 5)

37
Q

Below what airspeed does the flight control computer select CONF 1+F rather than CONF 1 when “flaps one” is called? How many degrees of flap is given?

A

Below 100kts, config given is 1+F
Above 100kts, config given is 1

10 degrees of flap are given in 1+F

38
Q

At what speed do the flaps auto-retract to 0?

A

210kts

39
Q

What are the (6) speedbrake inhibition conditions?

A

Flap FULL selected (3 or FULL on 321)
TOGA selected
SEC 1+3 fault
L or R elevator fault
Alpha floor activated
Angle of attack protection active

FCOM 27-10-20

40
Q

When does the autopilot disconnect in high speed protection?

A

VMO + 15 kt and MMO + 0.04

41
Q

Where are the two horizontal green bars displayed near to VMO in normal law?

A

VMO + 6 Kt

42
Q

How are th flight controls operated?

A

Electrically controlled Hyrdaulically activated.

43
Q

Which parts of the aircraft can be mechanically controlled?

A

The stabalizer and rudder

44
Q

What are the 7 flight control computers?
What do they control?

A

2 ELAC - Elevator Aileron Computer
For :
Normal elevator and stabilizer control.
Aileron control.

3 SEC - Spoiler Elevator Computer
For :
Spoilers control.
Standby elevator and stabilizer control.

2 FAC - Flight Augmentation Computer
For :
Electrical rudder control.

45
Q

What is an FCDC?

A

Flight Control Data Concentrators (FCDC) acquire data from the ELACs and SECs and send it to the electronic instrument system (EIS) and the centralized fault display system (CFDS).

46
Q

What controls the stabalizer?

A

A screwjack driven by two hydraulic motors drives the stabilizer.

The two hydraulic motors are controlled by :

One of three electric motors, or

The mechanical trim wheel.

47
Q

When we use speedbrake which of the spoilers deploy?

A

2 3 and 4

48
Q

How do we get full spoiler extension on landing?

Partial?

A

Lever armed, weight on wheels, idle thrust or reverse on one.
Lever not armed, weight on wheels, reverse on one.

Partial the same but only one wheel on ground.

49
Q

Why do we have a rudder travel limiter?

A

To prevent the rudder from being overstressed at high speed.

50
Q

Which computers control the slats and flaps?

A

Two slat flap control computers (SFCCs), each containing one slat channel and one flap channel.

51
Q

What happens if one SFCC fails?

A

If one SFCC is inoperative, slats and flaps both operate at half speed.

52
Q

Whatare the 4 FMGS modes of operation?

A

Dual mode (normal operation) Master and slave decided by AP1or2.
Independent mode (The FMGC’s dont talk to each other)
Single mode (One FMGC with two MCDU’s)
Back up Nav

53
Q

Which computer controls the autothrust?

A

The FMGC

54
Q

What is F speed?

A

Minimum speed at which the flaps may be retracted at takeoff.

In approach, used as a target speed when the aircraft is in CONF 2 or CONF 3.

55
Q

What is S speed?

A

Minimum speed at which the slats may be retracted at takeoff.

In approach, used as a target speed when the aircraft is in CONF 1.

56
Q

On a flaps 2 take off when we select flaps 1 what amount of flap and slat are we left with?

A

Below 210kts you get 1+F
Above 210kts you get 1, so just slats.

57
Q

What speed is flap auto retract?

A

210kts

58
Q

Which spoilers are used for roll control?

A

2,3,4 & 5

COAS 2022 (28 decks)

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