Flight Controls - WING Surfaces

Question 1

Flight Controls

Where are the flaperons located ?

Answer 1

Between the inboard and outboard flaps on both wings.

Question 2

Flight Controls

Do the Ailerons and Spoilers droop with the trailing edge flaps to improve slow speed performance ?

Answer 2

Yes, they do.

Just like the Flaperons.

Question 3

Flight Controls

Are the Ailerons ever locked in flight ?

Answer 3

YES, during high speed flight.

Question 4

Flight Controls

In normal mode, for roll control, what does a control wheel input command ?

Answer 4

Unlike conventional airplanes, it does not directly position the lateral surface in flight. Instead, it commands a rate of roll.

Question 5

Flight Controls

For ROLL control, do forces change with airspeed changes ?

Answer 5

No, they don’t.

Question 6

Flight Controls

In Primary (normal) mode, what hydraulic system powers the flaps and slats ?

Answer 6

CENTER
Positionned using the center hydraulic system motors.
They are controlled together.

Question 7

Flight Controls

How many Spoilers are there ?

Answer 7

14, all symmetrically paired

Question 8

Flight Controls

How are the Spoiler pairs powered ?

Answer 8

5 pairs are HYDRAULICALLY powered (1, 2, 3, 6 and 7)

2 pairs are ELECTRICALLY powered (4 and 5)

Question 9

Flight Controls

What does the EICAS message “SPOILERS PAIRS” indicate ?

Answer 9

3 or more Spoiler panels failed.

Question 10

Flight Controls

Will the Spoilers fully extend on landing even if they were NOT armed ?

Answer 10

Yes, they will under these conditions :

• On the ground,
• GS > 85 kts
• Either thrust lever was previously in the takeoff range before both are moved to the idle range (rejected takeoff)

OR

• On the ground,
• Both thrust reverse levers are moved to idle reverse detent.

Question 11

Flight Controls

Do the Spoilers ever self-retract ?

Answer 11

YES :

• On the ground and either thrust lever is moved to the takeoff range
• On the ground and there is a transition to in the air
• In flight and either thrust lever is > 90 % full travel

Question 12

Flight Controls

When is Autodrag used ?

Answer 12

To assist in glideslope/glidepath capture when the airplane is above the vertical path.

Question 13

Flight Controls

Which surfaces are used by the Autodrag feature ?

Answer 13

Ailerons (upwards) and the 2 most outboard spoiler pairs.

Question 14

Flight Controls

What are the conditions for Autodrag to function ?

Answer 14

• Landing configuration
• Flaps 25 or 30
• Thrust IDLE

Question 15

Flight Controls

Can Ailerons be used in High Speed flight ?

Answer 15

NO, the Ailerons are locked out since the Flaperons and Spoilers provide sufficient roll control.

Question 16

Flight Controls

In the ARMED position, when will the Spoilers extend on landing ?

Answer 16

• Main gear trucks un-tilt and

- Both thrust levers are not in the takeoff range.

Question 17

Flight Controls

Which surfaces provide roll control ?

Answer 17

• 2 Ailerons
• 2 Flaperons
• 14 Spoilers