FLIGHT CONTROLS

Question 1

ICAS msg: Rudder Overboost

Answer 1

If both systems running > 135 kts

Normally sys #1 shut off >135 kts

Question 2

Flap System consist off:

Answer 2

• FECU (flap electronic control unit)
• FPDU (flap power / drive unit)
• 2 motors
• Flexible shaft
• Jackscrews for each flap

Question 3

If one flap motor fail

Answer 3

Flaps will extend slower

Question 4

Pitch Trim components

Answer 4

• HSCU ( horizontal stab. Control unit )
• Main channel
• Backup channel
• Actuator
• Main motor
• Backup motor
• 2 Jackscrews

Question 5

HSA Excessive load protection

Answer 5

Trim system shuts off a channel if switch actuated for period of time that totalizes 16sec when Horizontal Stabilizer Actuator is stalled

Question 6

Rudder Hardover Protection

Answer 6

The rudder systems auto shut off if:

• Both engines > 56% N2
• Rudder deflection above 5° +-1°
• Force above 130lb opposite pedal

Question 7

Trim switch logic

Answer 7

• CA overrides FO
• Both override Autopilot
• Limited to 3 sec operation
• Backup vs Main- first operated

Question 8

Rudder Panels

Answer 8

• FWD Rudder

* AFT Rudder ( deflects further )

Question 9

FECU will stop flap movement if flap difference is ..°?

Answer 9

2° ( by flap velocity sensors )

Question 10

Trim switch protection

Answer 10

If 1/2 of any pitch trim switch in stuck for 7 seconds continuously, Control Unit will deactivate that faulty switch

Question 11

What some of the systems attached to HSCU?

Answer 11

• SPS ( during stick shaker no trim up )
• ADC ( adjust the trim rate for different speeds )
• Spoilers ( retrims when spoilers are open )

Question 12

What HSCU main channel control?

What trim?

Answer 12

Control column (yoke) trim
(Main trim)

Question 13

How many degrees can you pitch horizontal stab up/dn?

Answer 13

Up - 10°

Down - 4°

Question 14

Can you lock gust lock in-flight?

Answer 14

NO

Question 15

How do you trim ailerons?

Answer 15

You move the center position of the aileron

Question 16

What do you lose when you disconnected ailerons if:

1. Left aileron jammed
2. Right aileron jammed

Answer 16

Left:
• Left aileron
• Autopilot servo
• Pusher

Right:
• Right aileron
• Artificial feel unit

Question 17

What type of Rudders do we have?

Answer 17

Two in-tandem rudders

Rudder on rudder

Question 18

Do you have a feel unit on the elevators?

Answer 18

No

Question 19

Aileron Disconnect Pull

What control do you have?

Answer 19

• Captain side - left aileron

* FO side - right aileron

Question 20

What type of flaps?

Answer 20

Two double slotted flap panels

Question 21

How many Jack screws are there to move horizontal stab?

Answer 21

2

Question 22

• Spring Tab

* Servo Tab

Answer 22

• Spring Tab (inner tab)- moves at high speed
• Servo Tab (outer tab)- moves at low speeds
• Assist with elevator movement
• Both move opposite the elevator

Question 23

Pitch control consists of:

Tail

Answer 23

• Conventional cable operated elevator

* All moving horizontal stabilizer

Question 24

Control Column / Cabin Vibration
could be caused by?

How to check?

Answer 24

Elevator horn when elevator is not aligned with horizontal stabilizer

•Pitch slightly up or down

Question 25

Speed brakes can be operated when?

Answer 25

• Speed brake lever 0PEN
• TLA’s below 50° (low thrust)
• Flaps 0°-9°

Question 26

What’s the position of spring tab at slow speeds?

Answer 26

Aligned with the elevator

Question 27

Ground spoilers automatically open: (2)

Answer 27

• WOW >25kts

* TLA’s below 30° or Both N2 below 56%

Question 28

When you use speed brake in the air what panels are open?

Answer 28

Outboard panels

Question 29

Will Pitch trim work in Electrical Emergency?

Answer 29

Only Backup Trim

Question 30

What is a “Ruder Handover”

Answer 30

Uncommanded Ruder deflection