Flight Controls

Question 1

Secondary flight controls

Answer 1

Horizontal stabilizer
Slats and flaps
Multi function spoilers when used as speed brakes or spoilers
Dedicated ground spoilers

Question 2

Operation of ailerons

Answer 2

Cables operated by control wheel that run to hydro mechanical actuators.

Question 3

How are all but ailerons operated?

Answer 3

Fly by wire

Question 4

How does fly by wire work?

Answer 4

Primary actuary control electronics P-ACE receives signals from control system in flight deck… This sends signals to power the surface actuators or PCUs… The ace is assisted by the FCM… FLIGHT CONTROL MODULE which provides software base assistance and connects flight controls to other systems.

Question 5

What is PCU.

Answer 5

Power control unit

Question 6

What is ACE

Answer 6

Actuator control electronics

Question 7

FCM

Answer 7

Flight control module

Question 8

What controls have higher level functions?

Answer 8

Elevator
Multi function spoilers
Rudder
Horizontal stabilizer

Question 9

Describe the elevator

Answer 9

Electronically controlled and hydraulically actuated

Goes from pilot input or auto pilot… To ACE to PCU with inputs from the FCM for higher level functions

Question 10

Higher level functions for pitch

Answer 10

Gain on airspeed…. as speed increases pitch deflection decreases
Thrust compensation…… With thrust changes pitch control is maintained.
AOL limiting…..does not allow plane to stall

Question 11

Elements of the horizontal stabilizer

Answer 11

Electronically controlled and electrically actuated.
ACE……HSA (horizontal stab actuator
And the FCM FOR INPUT

Question 12

Higher level functions of horizontal stab

Answer 12

Keep airplanes trimmed with auto pilot during deployment of speed brakes….
Prevent structural damage at high speeds.

Question 13

Elements of the ailerons

Answer 13

Mechanically controlled and hydraulically actuated

Yoke moves cables which are attached directly to the hydraulic actuator to move controls.
No higher level functions.

Question 14

Multifunction spoilers

Answer 14

Five panels per wing… Outer three are multi function and the inner two are ground spoilers only.
MFS multi function spoilers…. Roll assist, speed brakes and ground spoilers.

Question 15

Speed brake auto retract when?

Answer 15

Flaps slats two or greater selected.
Speed less than 180
If power levers advanced above an angle of 70%
Speed brakes will not deploy in direct mode.
TLA thrust level angle

Question 16

Yah control

Answer 16

Rudder… Is electronically controlled and hydraulically actuated
Controls to ACE to PCU with inputs from FCM

Question 17

Higher level functions of rudder

Answer 17

Yaw damp
Turn coordination
Gain on speed. As speed increases rudder deflection decreases.

Question 18

Slats and flaps

Answer 18

Electronic controlled and electrically actuated.

Actuator control electronic moves the power drive unit that moms the flaps.

Question 19

Slats

Answer 19

Four per wing with two positions

Question 20

Type of flaps

Answer 20

Four slotted follower flaps.. Two per wing

A sensor provides protection from asymmetrical settings.

Question 21

Roll assist with MFS

Answer 21

Normal mode …… Scheduled as a function of airspeed and flap settings.
Direct mode….. Fixed gain applied independent of airspeed and flap setting.

Question 22

Ground spoilers deployment and retract

Answer 22

Deploy with weight on wheels… Wheels spin up above 45 knots and TLA LESS THAN 26 degrees…

Retract when wheel speed is less than 45 for at least 5 seconds or if TLA goes beyond 35 degrees.

Question 23

Primary flight controls

Answer 23

Ailerons and multifunction roll spoilers
Elevators
Rudder