Flight Controls (Excluding Flaps)

Question 1

How does the STAB Trim system function?

Answer 1

• HYD power is supplied for stab trim - Shuts off related system HYD power if unscheduled trim occurs.

Question 2

What surface components are moved when stab trim inputs are made?

Answer 2

• Leading edge of movable horizontal stab - Stab trim varies the angle of incidence of horiz stab

Question 3

What occurs when Stab Trim Switches are placed in CUTOUT? How about ON?

Answer 3

CUTOUT will shut off related HYD power to stab trim control module. ON will override AUTO if it has shut off system and restore HYD power.

Question 4

Describe the function of the alternate stab trim switches?

Answer 4

• Provide trim command through separate control channel - Provide increased range of stab trim travel

Question 5

How do FMCs calculate correct stab trim greenband?

Answer 5

• Entered CG - Entered Gross WT - Entered Takeoff Thrust Setting

Question 6

What provides 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.

Question 7

What is the effect on stab trim if the control wheel stabilizer trim switches are used while the A/P is engaged?

Answer 7

• If a single A/P is engaged, the A/P will disengage and stab trim will move in desired position. - If multiple A/Ps are engaged, the control wheel stab trim switches are inhibited.

Question 8

Do the alternate trim switches override the the A/P trim commands?

Answer 8

YES, with any number of A/Ps engaged

Question 9

Do the alternate trim switches disengage the A/Ps?

Answer 9

NO they do not - regardless of number of A/Ps engaged

Question 10

Which spoiler panel does not function as a flight spoiler?

Answer 10

Inboard spoiler on each wing * Flight spoilers operate w/ailerons to provide roll control

Question 11

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

Answer 11

All six on each wing

Question 12

Which spoiler panels are displayed on the EICAS status display?

Answer 12

• L = 4th spoiler panel in from the wingtip on the left wing - R = Outboard Most

Question 13

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

Answer 13

• Two inboard panels on each wing extend to mid travel - Two mid panels on each wing extend to full travel

Question 14

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

Answer 14

• TLs 1 & 3 near closed - Main gear touch down

Question 15

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

Answer 15

• TLs 1 & 3 near closed - Main gear on ground - Reverse thrust levers 2 or 4 pulled up to IDLE detent

Question 16

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

Answer 16

Reverse thrust levers 2 or 4 pulled to the IDLE detent with TLs 1 & 3 near closed. * same logic as landing NOT ARMED

Question 17

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

Answer 17

Thrust lever 1 & 3 advanced from the CLOSED position, regardless of whether ground spoilers were automatically or mechanically selected, the Speedbrake lever will be driven to the DN position.

Question 18

Which elevator panels are displayed on the Surface Position Indicator?

Answer 18

Left and Right Outboard Elevator Positions

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 out between the inboard and outboard elevators allow elevator control to be regained

Question 20

Describe the elevator feel system?

Answer 20

• Mechanism provides artificial feel at control columns - Force increases as airspeed increases - If both HYD SYS 2 &3 fail, mechanical springs provide feel force. Feel force is no longer a function of airspeed. SO Loss of HYD systems DO NOT AFFECT artificial feel

Question 21

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

Answer 21

• It locks the outboard ailerons in the neutral position at high airspeeds and permits full travel of outboard ailerons at low speed. - This prevents over-controlling at high speeds and provides the req’d roll authority at low airspeeds.

Question 22

Using the aileron trim when A/P is engaged does what?

Answer 22

• The aileron neutral point is repositioned - When A/P 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

Question 23

How to rudder ratio changers work?

Answer 23

• They gradually reduce each rudder surface’s response to pedal inputs as airspeed increases/ - System protects the vertical tail from stresses caused by large deflections at high airspeeds.

Question 24

Purpose of yaw dampers?

Answer 24

Improve directional stability and provide turn coordination

Question 25

What happens when Alt Stab Trim Switches or Control Wheel Switches are held in opposite directions?

Answer 25

No trim is commanded

Question 26

How will you know if a stabilizer trim indicator is inop?

Answer 26

It will display an OFF flag

Question 27

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

Answer 27

Inboard

Question 28

What happens when system logic detects a faulty yam damper?

Answer 28

• HYD PWR is removed - INOP Light ON * Same as turning OFF Switch

Question 29

Do yaw damper inputs move the rudder?

Answer 29

NO