Flight Controls

Question 1

Flap extension Speeds

Answer 1

Flaps 1: 230 kts 
Flaps 2: 215 kts 
Flaps 3: 200 kts 
Flaps 4 or 5: 180 kts 
Flaps FULL: 165 kts

Question 2

Which flight controls are fly-by-wire?

Answer 2

• Elevator
• Rudder
• Spoiler

Question 3

What is Electric PBIT?

Answer 3

The Electric PBIT (Power-Up Built-In Test) tests the electrical components of the FBW (fly-by-wire) sytem.

• It is automatically performed when airplane is powered up (ac power established)
• Takes 3 minutes to complete
• Test is good for 50 hours

Question 4

What actions will interrupt an Electric PBIT?

Answer 4

• Any hydraulic pump is turned on
• Flight control mode buttons are cycled
• AC Power is interrupted

Question 5

What is Hydraulic PBIT?

Answer 5

The Hydraulic PBIT tests the hydraulic components of the FBW system. The HYDR PBIT is automatically performed when all three hydraulic systems are pressurized. It takes 1 minute to complete.

Question 6

What actions will interrupt a Hydraulic PBIT?

Answer 6

Any flight control surface is moved.

Question 7

What are the mode annunciations for the flight controls?

Answer 7

Normal, Direct, Fail

Question 8

Normal mode annunciation of the flight controls?

Answer 8

The FCM’s (Flight Control Modules) provide high level functions susch as AOA limiting.

Question 9

Direct mode annunciation of the flight controls?

Answer 9

The FCM is bypassed and high level functions are not available.

Question 10

Fail annunciation of the flight controls?

Answer 10

Happens anytime the system is inoperative.

Hydraulic systems are not pressurized.

Question 11

Primary Flight controls consist of:

Answer 11

Ailerons and multi function roll spoilers - roll axis
Elevators for pitch axis control
Rudder for yaw axis control

Question 12

The secondary flight controls consist of:

Answer 12

Horizontal stabilizer
Flaps and slats
The multi-function spoiler(when used as speed brakes or ground spoilers)
Dedicated ground spoilers

Question 13

How are the ailerons commanded?

Answer 13

By conventional control cables that run from each control wheel back to a pair of hydro-mechanical actuators

Question 14

The primary flight control electronics include two complementary parts:

Answer 14

The primary actuator control electronics (P-ACE)

The Flight Control Module (FCM)

Question 15

Normal Mode of Flight controls (Higher level functions)

Elevator control laws scheduling with airspeed

Answer 15

FCM knows how fast we are going and won’t allow the control surface to deflect enough to damage the flight control

Question 16

Normal Mode of Flight controls (Higher level functions)

Auto thrust compensation with elevator

Answer 16

As the thrust levers move , the FCMs automatically adjust the elevator to compensate for the pitching moment in applying or removing thrust

Question 17

Normal Mode of Flight controls (Higher level functions)

Angle of attack limiting with elevator offset

Answer 17

helps prevent over AOA on the elevator when approaching the stall

Question 18

Normal Mode of Flight controls (Higher level functions)

Yaw damper and turn coordination

Answer 18

Deflects rudder to help maintain coordination in a turn

Question 19

Normal Mode of Flight controls (Higher level functions)

Rudder airspeed gain scheduling and stroke limiting

Answer 19

Adjusts rudder deflection limit based on airspeed so that we don’t overstress the control surface. Will also help in low airspeed conditions as well to maintain controllability

Question 20

Normal Mode of Flight controls (Higher level functions)

Roll spoiler scheduling with airspeed and speed brake deployment

Answer 20

When you go to roll the airplane it will deploy MF spoiler on low wing

Question 21

Normal Mode of Flight controls (Higher level functions)

Configuration change compensation with horizontal stabilizer due to speed brakes actuation

Answer 21

Minimizes the pitch down when speed brakes are applied by adjusting the pitch of the horizontal stabilizer

Question 22

What are the 3 different functions of the MF Spoilers ?

Answer 22

1. Roll Spoilers (in flight)
2. Speed Brakes (in flight)
3. Ground Spoilers (on ground)

Question 23

Sys 1 and Sys 2 cutout buttons do what?

Answer 23

They disable the the HS-ACE respective channel 1 or 2

Question 24

Hydraulic system 2 powers what components?

Answer 24

Landing Gear
Brake Inboard
MF spoiler 5
Ground spoiler 1
Nose wheel steering
Elevator inboard
aileron inboard

Question 25

How many Actuator Control electronics(ACE) and Flight Control Modules (FCM) are there?

Answer 25

4 FCMs
3 primary ACEs (P-ACE)
3 spoiler ACEs (S-ACE)
2 slat/flap ACEs (SF-ACE)
1 horizontal ACE (H-ACE