Flight Controls

Question 1

Describe the function of the Stabilizer (STAB) Trim Cutout Switches, AUTO position.

Answer 1

• Supplies hydraulic power for stabilizer trim
• Shuts off related system hydraulic power if unscheduled trim detected.

Note:FCOM, VOL 2; 9.10.2

Question 2

What surface component is moved when stabilizer trim inputs are made?

Answer 2

• Leading edge of the movable horizontal stabilizer
• Stabilizer trim varies the angle of incidence of the horizontal stabilizer.

Note:FCOM, VOL 2; 9.20.3

Question 3

State what occurs when the Stabilizer Trim CUTOUT Switches are in CUTOUT.

Answer 3

• Shuts off related hydraulic power to stabilizer trim.

Note:FCOM, VOL 2; 9.10.2

Question 4

Describe the function of the alternate trim switches.

Answer 4

• The switches provide trim commands through a separate control channel.
• The switches provide an increased range of stabilizer trim travel.

Note:FCOM, VOL 2; 9.20.4

Question 5

How do the FMCs calculate correct stabilizer trim greenband?

Answer 5

• They use calculated CG, and
• The calculated gross weight, and
• The takeoff thrust derate selection.

Note:FCOM, VOL 2; 9.20.4

Question 6

How does the aircraft provide a crosscheck to ensure the correct greenband has been displayed?

Answer 6

• A nose gear oleo pressure switch position is compared to the calculated greenband.

Note:FCOM, VOL 2; 9.20.4

Question 7

What is the effect on stabilizer trim if the control wheel stabilizer trim switches are used while the autopilot is engaged?

Answer 7

• If a single autopilot is engaged, the autopilot will disengage and the
stabilizer trim will move in the desired direction.
• If multiple autopilots are engaged, the control wheel stabilizer trim
switches are inhibited.

Note:FCOM, VOL 2; 9.20.5

Question 8

State the effect on the autopilots and stabilizer trim, if the alternate trim switches are used with any number of autopilots engaged.

Answer 8

• The alternate trim switches override autopilot trim commands.
• The alternate trim switches do not cause autopilot disengagement.

Note:FCOM, VOL 2; 9.20.5

Question 9

How many spoiler panels are provided?

Answer 9

• 6 spoiler panels on each upper wing

Note:FCOM, VOL 2; 9.20.11

Question 10

Which spoiler panel does not function as a flight spoiler?

Answer 10

• Inboard spoiler on each wing

Note:FCOM, VOL 2; 9.20.7

Question 11

Which spoiler panels function as speedbrakes in flight?

Answer 11

• The four inboard panels on each wing

Note:FCOM, VOL 2; 9.20.11

Question 12

Which spoiler panels function as ground spoilers when on the ground?

Answer 12

• All six spoiler panels on each wing

Note:FCOM, VOL 2; 9.20.11

Question 13

Which spoiler panel is displayed on the EICAS status display?

Answer 13

• 4th spoiler panel in from the wingtip on the left wing.
• (this panel functions as a flight spoiler, speedbrake, & gnd spoiler)
• the outermost panel on the right wing (flight spoiler and ground spoiler
only, and therefore, speedbrake extension is not displayed on the right
wing’s spoiler position indicator)

Note:FCOM, VOL 2; 9.20.12

Question 14

Which spoiler panels are extended with the speedbrake lever in the flight detent position?

Answer 14

• The two inboard spoilers on each wing extend to mid-travel.
• The two middle spoiler panels on each wing extend to full travel.

Note:FCOM, VOL 2; 9.20.12

Question 15

When do the spoiler panels extend to the UP position during landing, if the speedbrake lever is ARMED?

Answer 15

• Thrust levers 1 and 3 near idle
• Main landing gear touch down.

Note:FCOM, VOL 2; 9.20.12

Question 16

When do the spoiler panels extend to the UP position during landing if the speedbrake lever is NOT Armed?

Answer 16

• Thrust levers 1 and 3 near idle
• Main landing gear on the ground
• Reverse thrust levers 2 or 4 pulled up to the idle detent

Note:FCOM, VOL 2; 9.20.12

Question 17

Since the speedbrake lever is in the DN position during takeoff, what action provides an automatic spoiler function for RTO?

Answer 17

• Reverse thrust levers 2 or 4 pulled to the idle detent.

Note:FCOM, VOL 2; 9.20.12

Question 18

Which elevator panels are displayed on the Surface Position Indicator?

Answer 18

• Left and right outboard elevator positions

Note:FCOM, VOL 2; 9.10.14; 9.20.2

Question 19

What can you do if you lose elevator control due to a jam?

Answer 19

• When significant manual force is applied to the control column, shear outs between the inboard and outboard elevators allow elevator control to be regained

Note:FCOM, VOL 2; 9.20.2

Question 20

Describe the elevator feel system.

Answer 20

• Mechanism provides artificial feel at control columns.
• Force increases as airspeed increases
• If both hydraulic systems 2 and 3 fail, mechanical springs provide feel force. Feel force is no longer a function of airspeed.

Note:FCOM, VOL 2; 9.20.2

Question 21

For go-around protection, what action drives the speedbrake lever to the DN position?

Answer 21

• Thrust lever 1 or 3 advanced from the idle position, regardless of whether ground spoilers were automatically or manually selected.

Note:FCOM, VOL 2; 9.20.12

Question 22

How does the aileron lockout system work, and what is its purpose?

Answer 22

• How it works: Locks the outboard ailerons in the neutral position at 238
knots
• Purpose: Permits full travel of the outboard ailerons at low airspeeds,
and
• Prevents over-controlling at high airspeeds, and
• Provides the required roll authority at low airspeeds.

Note:FCOM, VOL 2; 9.20.7

Question 23

What would happen if you use aileron trim with the autopilot engaged?

Answer 23

• The aileron neutral point is repositioned.
• When the autopilot is disengaged, the wheel and ailerons move to the repositioned aileron neutral point.
• The airplane responds with roll proportional to the amount of aileron trim input.

Note:FCOM, VOL 2; 9.20.7

Question 24

How do the rudder ratio changers work?

Answer 24

• Rudder ratio changers gradually reduce each rudder surface’s response to pedal inputs as airspeed increases.
• The system protects the vertical tail from stresses caused by large rudder surface deflections at high airspeeds.

Note:FCOM, VOL 2; 9.20.9

Question 25

What is the purpose of the yaw dampers?

Answer 25

* To improve airplane lateral and directional stability * To provide turn coordination Note:FCOM, VOL 2; 9.20.10

Question 26

Which elevators, inboard or outboard, move as a direct result of control column inputs?

Answer 26

Inboard

Question 27

Which spoilers panels function as speedbrakes in flight?

Answer 27

The four inboard panels. The two inboard spoilers extend to mid travel only.

Question 28

Which spoiler panels operate with the ailerons to provide roll control?

Answer 28

All spoilers except the inboard one on each wing.

Question 29

Which spoilers panels function as ground spoilers?

Answer 29

All six spoilers on each wing.

Question 30

How does the airplane calculate the correct green band position for takeoff?

Answer 30

The FMC use center of Gravity, gross weight, and takeoff thrust setting to calculate the correct green band.