Flight Controls

Question 1

Why are ELAC1, SEC1 and FAC1 grouped together on left FLT CTL panel?

Answer 1

In the emergency electrical configuration these remain operative (ESS power still available)

*FAC1 becomes inoperative when electrical supply is in a batteries-only configuration.

Question 2

What happens if both ELACs fail? (4 items)

Answer 2

-degrade to alternate law.

-both ailerons inoperative and roll control provided by spoilers.

-elevator and THS control provided by the SECs.

-both autopilots will be inoperative.

Question 3

Which SECs control which spoilers?

Answer 3

SEC1- spoilers 3 & 4

SEC2- spoiler 5

SEC 3- spoilers 1 & 2

Question 4

What do SEC1 and SEC2 provide backup for?

Answer 4

Elevator and THS control should both ELACs fail.

Question 5

What happens if all three SECs fail? (3 items)

Answer 5

-degrades to alternate law.

-speedbrakes and spoilers are all inoperative and roll is controlled by ailerons only.

-backup pitch control is lost.

Question 6

If both FACs fail what happens? (4 items)

Answer 6

-degrades to alternate law.

-rudder controlled through pedals by mechanical connection.

-rudder trim, yaw damping and rudder limiting are lost.

-both autopilots will be inoperative.

Question 7

How long must takeover pb be held to deactivate other side stick? Can it be reactivated?

Answer 7

40 seconds.

Yes- by pressing takeover pb on deactivated side stick.

Question 8

Which hydraulic systems power which elevator servos?

Answer 8

Left- Blue and Green
Right- Blue and Yellow

Question 9

What is the purpose of damping mode on the elevator servos?

Answer 9

One servo is active and the other is in damping mode- follows surface movement and is available in case of failure.

Question 10

What happens in the case of dual elevator servo failure?

Answer 10

Servos revert to centring mode and align the elevator with the THS.

Question 11

Which hydraulic systems power the THS?

Answer 11

Green and Yellow- independent motors power the THS screwjack.

Question 12

Which hydraulic systems power the aileron servos?

Answer 12

Green and Blue.
One is active and one is in standby (damping).

Question 13

How many servos power spoilers and what happen if one servo fails?

Answer 13

One servo per spoiler panel.

Should one panel fail, the corresponding panel on other wing is automatically deactivated to prevent asymmetry.

Question 14

What happens to spoiler position if hydraulic pressure is lost?

Answer 14

Spoilers will remain at current position, or less if pushed down by aerodynamic forces.

Question 15

How many hydraulic systems power rudder servos?

Answer 15

All 3 via independent servos.

*also via mechanical linkage between rudder pedals and servos in case of dual FAC failure (Requires at least 1 hydraulic system).

Question 16

Yaw damper 1 (FAC1) and Yaw damper 2 (FAC2) are controlled by which hydraulic systems?

Answer 16

1- Green
2- Yellow

Question 17

What happens to rudder limiting if both FACs fail?

Answer 17

Rudder travel limit initially frozen in it’s current position.

When slats are extended, limiting is removed to allow full rudder authority during an approach.

Question 18

Which spoilers are used for:

Roll control?
Speedbrake?
Ground spoiler?

Answer 18

Roll control: outer 4
Speedbrake: middle 3
Ground spoiler: all 5

Question 19

What happens if speedbrake is selected past half with autopilot engaged?

Answer 19

Panels will extend no further than half.

If autopilot is disengaged with handle past half, panels will rapidly extend to match handle position.
(Likewise will rapidly retract is autopilot engaged).

Question 20

At what flap positions are speed brakes available and inhibited?

Answer 20

Available 0 through 3.

Inhibited at FULL. Speed brakes will automatically retract if FULL flap is selected.

*also inhibited/retracted if TOGA applied or certain high AOA positions are encountered.

Question 21

What are the requirements for ground spoiler deployment?

Answer 21

-both main gear compressed.

-both main gear wheel speed >72kts.

-if armed- both thrust levers at idle.

-unarmed- at least one thrust lever in REV, with other in idle or REV.

Question 22

When will spoilers partially extend to reduce hydroplaning?

Answer 22

Armed with at least one landing gear compressed and at least one thrust lever in reverse.

Question 23

Will armed spoilers automatically retract after landing?

Answer 23

Only if thrust levers advanced above idle- for a rejected landing/go around after touchdown.

Question 24

What is the maximum flight level for slat/flap extension?

Answer 24

FL200

Question 25

Will slats and flaps still operate if one SFCC fails?

Answer 25

Yes, but at half their normal speed.

Question 26

Which hydraulic systems power the two slat motors and two flap motors?

Answer 26

Slats- Blue and Green.
Flaps- Green and Yellow.

This means loss of Blue system only affects slats and loss of Yellow system only affects flaps.

Loss of green affects both.

Question 27

Will slat and flap WTB affect each other?

Answer 27

No- if one is activated the other can continue to operate normally.

Question 28

What does Flaps 1 correspond to on the ground or Flaps 1, 2, 3, FULL correspond to when extend in flight?

Answer 28

Flaps 1 on ground: 1+F (flaps and slats at first position)

In flight:
Flaps 1: slats 1/flaps up
Flaps 2: slats 2/flaps 2
Flaps 3: slats 2/flaps 3
Flaps FULL: slats 3/flaps 4

Question 29

What happens if Flaps 1 is selected in flight from Flaps 2 or greater?

Answer 29

Retracts to 1+F (slats 1/flaps 1)

Question 30

What happens if aircraft accelerates above 210kts with Flaps extended?

Answer 30

Flaps will retract to protect against overspeed, however slats will remain extended.

*must return handle to 0 to regain control.

Question 31

What is Slat Alpha/Speed Lock and when does it engage?

Answer 31

Inhibits slat retraction at high angles-of-attack and low speeds

When the FLAPS lever is set to 0, the slats alpha/speed lock function activates and inhibits slats retraction, if:
‐ The AOA is above 8.5 °, or
‐ The speed is less than 148 kt

*A-LOCK pulses.