Flight Controls

Question 1

How are the ailerons and rudder controlled?

Answer 1

Hydraulic with mechanical backup.

Question 2

How is the elevator controlled?

Answer 2

All mechanical pulleys and cables.

Question 3

3 Axis trim system.

Answer 3

All electrical.

Question 4

Elevator components.

Answer 4

1. Stick pusher activated by low speed awareness tape.
2. Stick Shaker activated by Pitch Limit Indicator when Red (within 2º).
3. Servo tab - helps move at low speeds.
4. Spring tab - helps move at high speeds. (Inboard)
5. Pitch trim - two motors with two channels.
   – Moves leading edge of stabilizer.
   – Brain is HSCU (Horizontal Stab Control Unit)
   – Controls rate of trim depending on airspeed.

Question 5

Aileron components.

Answer 5

1. Artificial feel connected to FO control column.

2. Aileron trim repositions artificial feel’s neutral position.

Question 6

Rudder components.

Answer 6

1. Yaw damper (max 35,000 feet without)
2. Hardover protection - Hyd pressure shut off when rudder 5º deflection and more than 130lbs of force applied opposite when engines @56% N2.
3. Yaw trim

Question 7

Flaps

Answer 7

1. All electric, double slotted fowler flaps.
2. 1 inboard and 1 outboard.
3. Controlled by FECU (Flap Electronic Control Unit)

Question 8

Speed Brakes

Answer 8

4 total controlled by SCU (Spoiler Control Unit)
• 2 outboard (in flight)
– Deployed when open and flaps 0 or 9 plus TLA 50º or lower.
• 2 inboard (ground spoilers)
– Deployed when wheel speed above 25 knots and both TLAs below 30º

Question 9

Stall Protection

Answer 9

Shaker
• PLI (Pitch Limit Indicator) activates the shaker when red (within 2º)

Pusher (Above 200 knots 1 channel inop)
• Won't activate when;
   – On ground
   – Below 5Gs
   – QD button pressed
   – Below 200RA
   – Cutouts pushed