Flight Controls

Question 1

What type of Flaps?

Answer 1

Double-slotted fowler flaps that move rearward and down

Question 2

How many PCUs aileron

Answer 2

2 per side

Question 2

Gust lock for Ailerons?

Answer 2

Flutter damper if pressure lost to PCU in flight.

On the ground the flutter damper, PCU, and trapped pressure

Question 3

Which controls are fly by wire ?

Answer 3

Spoilerons electronically hydraulically actuated

Question 4

What happens if an aileron PCU causes un-commanded roll with an aileron runaway?

Answer 4

Bungee breakout

Green PLT/CPLT ROLL light illuminates in front of the pilot that has control

Question 5

What is the SECU

Answer 5

Spoiler Electronic Control Unit- use electronic inputs and information from airspeed to determine spoiler deflection

Question 7

How many Rudder PCUs

Answer 7

3 PCUs only one must work for trim to work

Yaw damper 1 and 2

Question 8

When do Flaps operate at 1/2 speed

Answer 8

Failure of single PDU or one FECU channel

PDU-Power Drive Unit

Question 9

How are the left and right elevators connected

What mechanically moves them

Answer 9

• Each side is separate except for the connection CA left side, FO right side
• 2 elect motors and a jack screw

Question 9

How many spoilers on each wing

Answer 9

4-spoileron, flight spoiler, out board and in board ground spoiler

Question 10

When do Flaps operate at 1/2 speed

Answer 10

Failure of single PDU or one FECU channel

PDU-Power Drive Unit, you get a FLAP HALFSPEED status message

Question 12

What causes Takeoff Config Warning

Answer 12

Flaps
Flight spoilers
Autopilot
Parking brake
Aileron trim
Rudder trim
Horizontal stabilizer trim
Checked by the proximity sensing units

Question 13

How many total PCUs?

Answer 13

6-elevator
3-rudder
2-each aileron

Question 14

When does Half bank come on

Answer 14

Auto at 31,600 or when selected on

Question 14

What happens if an elevator is jammed

Answer 14

Jams usually overpowered by the other 2 PCUs

Question 15

How do the Flaps operate

Answer 15

2 power drive units (PDUs) that power the flex shaft, one motor fails flaps travel at half speed

Question 16

Explain function of flutter dampers on elevator

Answer 16

Keeps the elevator from fluttering if a loss of hydraulic pressure at a PCU
Gust lock when on the ground

Question 17

How is pitch control provided

Answer 17

Elevator assisted by a moveable horizontal stabilizer

Question 18

What spoilers make up the Ground Lift Dump system

Answer 18

ALL 
Spoilerons
Flight spoilers
Inboard Ground Spoilers
Outboard Ground Spoilers

Question 19

When is GLD system armed for Takeoff

Answer 19

• GLD switch is in the armed position
• Either engine greater than 79% N1
• Wheel speed greater than 45kts

Question 20

What conditions are necessary for deployment of GLD on landing

Answer 20

• L or R WOW
• Wheel speed greater than 16kts
• Radio Altimeter less than 5 ft

Question 21

What hydraulic systems power which flight controls

Answer 21

• System 1: Rudder, Elevator, Left Aileron, Left Spoileron, Left Flight Spoiler, Outboard Ground Spoiler
• System 2: Rudder, Elevator, Right Aileron, Right Spoileron, Right Flight Spoiler, Inboard Ground spoiler
• System 3: Rudder, Elevator, Both Ailerons, Both Spoilerons