Flight Controls and Landing Gear

Question 1

How are cockpit control wheels connected to flight controls?

Answer 1

Captains control wheel connected by cables to aileron PCU through aileron feel and centering unit

First Officers control wheel connected by cables to spoiler PCU through spoiler mixer.

Cable drive system allows actuation of both ailerons and spoilers by either control wheel

Question 2

“Aileron Transfer Mechanism”

Answer 2

Captain or FO can provide roll control in either system is jammed

Question 3

Aileron trim switches

Answer 3

Both switches must be pushed to command trim changes.

Trim electrically repositions the aileron feel and centering unit which causes wheel to rotate and redefines neutral.

Question 4

Flight Spoilers

Answer 4

Can be used as speed brakes or to supplement roll control. A spoiler mixer connected to the aileron cable drive controls hydraulic PCUs on each spoiler.

Question 5

Pitch control provided by

Answer 5

Hydraulically powered elevators and electrically powered stabilizer.

Question 6

Elevators

Answer 6

Cables connect the control column to elevator PCUs powered by HYD system A or B, elevators are connected by a torque tube.

Question 7

Elevator Feel

Answer 7

Provides simulated aerodynamic forces using airspeed from the elevator pitot system and stabilizer position. Feel is transmitted by elevator feel and centering unit.

Question 8

Horizontal Stabilizer

Answer 8

Positioned by main electric trim motor or manually through trim wheel.

Question 9

Nose gear viewer

Answer 9

Cover plate on floor just inside cockpit door, WHEEL WELL light must be on

Question 10

RTO

Answer 10

Automatically provides max braking pressure when thrust levers are retarded to idle at or above 90 kts

Question 11

Nose wheel steering

Answer 11

Tiller provides 78° in either direction

Question 12

Main Gear held up by

Answer 12

Mechanical Uplocks

Question 13

Nose gear held up by

Answer 13

Over center lock and mechanically linked doors

Question 14

Hydraulic systems power the landing gear how?

Answer 14

A system is normal

B can raise the gear through the Landing Gear Transfer Valve

Question 15

Landing gear extension

Answer 15

Hydraulic A system is used to release uplocks, gear extends by hyd pressure, gravity and air loads.

Question 16

What holds gear down and locked?

Answer 16

Overcenter mechanical and hyd locks.

Question 17

Secondary Main Landing Gear position indicator system

Answer 17

Installed on cockpit overhead panel P5 to provide backup means of verifying gear down and locked

Question 18

Brake system includes

Answer 18

Normal brakes, 
Alternate brakes, 
Brake accumulator, 
Antiskid protection, 
Autobrake system, 
Parking brake

Question 19

Air Ground safety system

Answer 19

Sensors located on right main and nose gear