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.
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.
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.

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.

FCOM VOL 2; 9.20.4

Question 5

How do the FMCs calculate correct stabilizer trim greenband?

Answer 5

• The FMC’s use the calculated gross weight,
• Centre of gravity, and
• The takeoff thrust derate selection.
- position of the nose gear oleo pressure switch is compared to calculated
green band as a cross check.

FCOM, VOL 2; 9.20.4

Question 6

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

Answer 6

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

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.

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 with
any number of auto pilots engaged.
• The alternate trim switches do not cause autopilot
disengagement.

FCOM, VOL 2; 9.20.5

Question 9

How many spoiler panels are provided?

Answer 9

• 6 spoiler panels on each upper wing

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.

FCOM, VOL 2; 9.20.11

Question 11

Which spoiler panels function as speedbrakes in flight?

Answer 11

• The four inboard panels on each wing.

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.

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)

FCOM, VOL 2; 9.20.11

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.FCOM, VOL 2; 9.20.11

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, and
• Main landing gear touch down.FCOM, VOL 2; 9.20.11

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, and
• Main landing gear on the ground, and
• Reverse thrust levers 2 or 4 pulled up to the idle detentFCOM, VOL 2; 9.20.11

Question 17

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

Answer 17

• Main gear on the ground, and
• Thrust levers 1 and 3 near idle, and
• Reverse thrust levers 2 or 4 pulled to the idle detent.FCOM, VOL 2; 9.20.11

Question 18

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

Answer 18

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

FCOM, VOL 2; 9.20.11

Question 19

Which elevator panels are displayed on the Surface Position Indicator?

Answer 19

• Left and right outboard elevator positions.

FCOM, VOL 2; 9.10.13; 9.20.2

Question 20

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

Answer 20

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

FCOM, VOL 2; 9.20.2

Question 21

Describe the elevator feel system?

Answer 21

• Elevator feel and centering mechanism provides artificial feel in the
control column.
• 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.

FCOM, VOL 2; 9.20.2

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 airspeeds above 238kts.
• 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.

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, by the feel and trim mechanism.
• 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.

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.

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, and * To provide turn coordination. FCOM, VOL 2; 9.20.10

Question 26

YAW DAMPER ON/ INOP switch positions?

Answer 26

``` ON - Yaw damper is powered. INOP light illuminated. - Yaw damper switch is off, - Yaw damper is in operative, or - IRU’s still in alignment mode. Remains illuminated until the first IRU is aligned. ```