Flight Controls/Stall Protection

Question 1

All flight controls are ________ except for the ______

Answer 1

Fly-by-wire, Ailerons

Question 2

What is the E-PBIT?

Answer 2

Electrical Power-Up Built-In Test

Tests the electrical components of the fly-by-wire system.

Question 3

When does the E-PBIT start?

Answer 3

Automatically when the airplane is powered up (AC established).

Question 4

How long does the E-PBIT take?

Answer 4

3 minutes

Question 5

What can interrupt the E-PBIT?

Answer 5

1. Any hydraulic pump turned ON
2. Flight Control Mode Buttons are cycled
3. AC power is interrupted

Question 6

How long is the E-PBIT test good for?

Answer 6

50 hours

Question 7

When should you run an E-PBIT?

Answer 7

First flight of the day

Question 8

What is the H-PBIT?

Answer 8

Hydraulic Power-Up Built-In Test

Tests the hydraulic components of the fly-by-wire system.

Question 9

When does the H-PBIT occur?

Answer 9

Automatically when all three hydraulic systems are pressurized.

Question 10

How long does the H-PBIT take?

Answer 10

1 minute

Question 11

What can interrupt the H-PBIT?

Answer 11

Any flight control surface moved

Question 12

How long is the H-PBIT good for?

Answer 12

50 hours

Question 13

What are the two modes the flight controls can operate in?

Answer 13

Normal and Direct

Question 14

What occurs in NORMAL mode for the flight controls?

Answer 14

Flight Control Modules (FCMs) are used to provide higher level functions.

Question 15

What are some of the higher level functions of the elevator?

Answer 15

1. AOA limiting (Limits AOA the closer to stall)
2. Thrust Compensation (Helps prevent pitching moments with thrust change)
3. Elevator Control Laws Scheduling with Airspeed (less deflection at higher speeds)
4. Configuration Change Compensation (More stable in pitch when using speedbrakes)

Question 16

What are some of the higher level functions of the rudder?

Answer 16

1. Rudder Flight Authority
2. Yaw Damper and Turn Coordination via AFCS

Question 17

What are some of the higher level functions of the spoilers?

Answer 17

1. Roll spoiler scheduling with airspeed and speedbrake deployment (more precise low-speed roll control)
2. Ground spoilers automatic deployment on landing and stowed if thrust added for go-around

Question 18

What is the logic behind a movement of a control surface starting at the yoke?

Answer 18

Control –> Actuator Control Electronics (ACE) –> Flight Control Module (FCM) –> ACE –> Power Control Unit (PCU)

Question 19

How many multi-function spoilers and ground spoilers?

Answer 19

3 MF spoilers per wing and 2 ground spoilers per wing

Question 20

How is pitch trim accomplished?

Answer 20

By moving the horizontal stabilizer

Question 21

When will the speedbrakes automatically retract?

Answer 21

1. Airspeed lower than 180 knots
2. Thrust 70 degrees
3. Flaps greater than 1

Question 22

What is the pitch trim priority?

Answer 22

1. Back Up Switches
2. Captain
3. First Officer
4. Autopilot