Flight Controls

Question 1

What is the meaning of a flag on the Stab Trim Indicator?

Answer 1

If in view trim indicator is INOP

Question 2

When are spoiler panels automatically commanded UP (extended)?

Answer 2

Speed Brake Lever DN (not armed)

• main landing gear on the ground
• Eng 1 AND 3 thrust levers idle and Eng 2 OR 4 thrust reverser lever raised
• spoilers will retract if Eng 1 OR 3 thrust lever moved above idle (go around protection)

Speed Brake Lever ARMED:

• main landing gear on the ground
• Eng 1 AND 3 thrust levers idle
• spoilers will retract if Eng 1 OR 3 thrust lever moved above idle (go around protection)

Question 3

Flap Lever Positions and Normal TO/LNDG ranges

Answer 3

UP
1 - stop gate - Inboard and Midspan Leading Edge Flaps extend
5 - all leading edge flaps extend
10 - normal TO range
20 - stop gate - normal TO range 
25 - normal LNDG range
30 - normal LNDG range

Question 4

In transit what does the white flap position indicator translate?

Answer 4

The actual position fo the slowest trailing edge flap group

Question 5

What EICAS messages indicate Flaps are not operating normally?

Answer 5

• FLAPS CONTROL
• FLAPS DRIVE
• FLAPS PRIMARY

Question 6

Flight Control Surfaces

Answer 6

Pitch:

• 4 elevator surfaces
• movable horizontal stabilizer

Roll:

• 4 ailerons
• 10 (of 12 panels) spoilers

Yaw:
- upper and lower rudder

Question 7

Elevator Control

Answer 7

• hydraulically actuated, mechanically commanded through control wheel
• inputs hydraulically actuated inboard elevators
  
  • Left Inboard: HYD 1 and 2
  • Right Inboard: HYD 3 and 4
• inboard elevator panel position controls related outboard elevator actuator
  
  • Left Outboard: HYD 1
  • Right Outboard: HYD 4
• Artificial feel provided thought Elevator Feel Unit (HYD 2 and 3)
  
  • elevator feel a function of airspeed

Question 8

Stabilizer Trim

Answer 8

2 Channels:

• Normal (control wheel trim switches)
• Alternate (alternate trim switches

2 Stabilizer Trim Control Modules each command an actuator

• HYD 2 ——> Stab Trim Control Module
• HYD 3 ——> Stab Trim Control Module
• with only one STCM trim is at 1/2 rate

*Alternate Trim overrides autopilot and does not disengage AP

Question 9

How is takeoff trim calculated?

Answer 9

• FMS gross weight
• center of gravity
• takeoff thrust selection
• takeoff flap setting entry
• green band is cross checked with position of nose hear pressure switch

Question 10

Speed outboard ailerons are locked at neutral

Answer 10

238 knts

Question 11

Which control surfaces are available for roll control with a control wheel jammed?

Answer 11

• ailerons corresponding to free control wheel

- half the flight spoilers

Question 12

Which spoiler surfaces are used for roll control in flight?

Answer 12

All surfaces except inboard spoiler

Question 13

Aileron Control

Answer 13

Inboard and Outboard Ailerons are hydraulically controlled

Left Outboard - HYD 1 and 2
Right Outboard - HYD 3 and 4
Left Inboard - HYD 1 and 3
Right Inboard - HYD 2 and 4

Question 14

What’s installed to overcome a flight control surface jam?

Answer 14

Elevator - shearouts between inboard and outboard surfaces
Aileron - shearouts between control wheels
Rudder - shearouts in rudder system

*significant force must be applied to control wheel or rudder pedals

Question 15

Purpose of Rudder Ratio Changer

Answer 15

• two rudder ratio changer systems (Upper and Lower)
• reduces rudder surface response as airspeed increases
• protects vertical tail from stress from large rudder inputs at high airspeed

Question 16

Purpose of Yaw Dampers

Answer 16

• two yaw dampers (upper and lower)
• upper powered by HYD 3
• lower powered by HYD 2
• improve lateral and directional stability
• provides turn coordination
• counters yaw with control inputs to prevent Dutch roll tendency

Question 17

Rudder Control

Answer 17

Mechanically controlled via rudder pedals, hydraulically actuated

• upper surface has 3 actuators (HYD 1 - top; HYD 3 - middle and bottom)
• lower surface has 2 actuators (HYD 4 - top; HYD 2 - bottom)

Rudder trim is available through rudder trim selector
-rudder feel and trim mechanism reposition neutral point

Question 18

How many spoiler surfaces?

Answer 18

12 spoilers (6 per wing)

• all 6 panels on each wing for ground spoilers
• 4 inboard on each wing used for speed breaks
• 5 outboard used for roll
• left wing 4th spoiler in from wingtip used for EICAS position
• right wing outboard-most spoiler used for EICAS position (will not show Speedbrake indication)

Question 19

Which Hydraulic Systems control spoilers?

Answer 19

HYD 2, 3, and 4

3,2,2,3 4,4 4,4 3,2,2,3

Question 20

Flap Groups

Answer 20

Leading Edge (pneumatically powered from bleed air)

• outboard group
• midspan group
• inboard group

Training Edge

• inboard group (powered by HYD 1)
• outboard group (powered by HYD 4)

Question 21

How many leading edge flaps?

Answer 21

Inboard - 3
Midspan - 5
Outboard - 6

Question 22

How are the flaps controlled?

Answer 22

Flap lever transmits desired position to Flap Control Units
- 3 identical FCUs

FCUs:

• control flaps in primary or secondary mode
• control flap sequencing
• control asymmetry, disagreements, and uncommanded motion
• control flap and load relief in primary mode only
• send flap position information to EICAS and other systems

Drive Units

• each LE Flap group has its own unit
  
  • pneumatic power in Primary Mode
  • electric motor secondary/alternate mode
• each TE Flap group has its own unit
  
  • hydraulic power in Primary Mode
  • electric motor secondary/alternate mode

Question 23

Flap control modes

Answer 23

Primary:

• leading edge pneumatically from bleed air
• trailing edge hydraulically (HYD 1 and 4)

Secondary

• leading and trailing edge flaps driven through electric motors
• flaps move much slower than in Primary mode

Alternate

• FCUs are bypassed
• all flaps are extended or retracted by electric motor
• flap lever inoperative

Question 24

Flaps Sequencing

Answer 24

Primary and Secondary Modes:

Up to 1: leading edge inboard and midspan groups extend
1 to 5: leading edge outboard group extend and all trailing edge groups move to 5
10, 20, 25, 30: trailing edge groups move to selected position

Alternate mode:

Extension: leading and trailing edge flaps extend immediately
*maximum extension for trailing edge flaps is 25
Retraction: all leading edge flaps retract after all trailing edge flaps have been retracted

Question 25

Flap Load Relief

Answer 25

- only available in Primary Mode | - if airspeed limit is exceed in flaps 25 or 30 flaps will retract to 20 or 25 as needed

Question 26

What happens to Elevator Feel if HYD SYS #2 and #3 fail?

Answer 26

- The Elevator Feel Sys is unavailable - feel forces are provided by mechanical springs * elevator feel is not a function of airspeed

Question 27

Purpose of STAB TRIM CUT OUT switches

Answer 27

- control hydraulic pressure to STCMS - In AUTO: HYD pressure is automatically cutout for uncommanded trim - CUTOUT: manually disables the affected trim system - ON: overrides automatic cutout

Question 28

Which spoiler panels are referenced on the STAT synoptic page?

Answer 28

- Panel #4 (Roll spoiler, ground spoiler, speedbrake) | - Panel #12 (roll spoiler, ground spoiler)

Question 29

Position for flight spoilers with lever in FLIGHT DETENT

Answer 29

- two inboard spoilers move to mid-travel position | - two middle spoilers move to full-travel position

Question 30

>SPEEDBRAKES EXT

Answer 30

Lever aft of ARM: - between 15’ RA and 800’ RA; or - flaps set for landing; or - two more more thrust levers forward of idle

Question 31

How is rudder trim applied?

Answer 31

- Manual rotation of rudder control knob - activates a motor which gives input to feel and trim unit - feel and trim unit repositions the neutral point

Question 32

What happens if a rudder ratio changer fails?

Answer 32

- the response of the associate rudder panel or the rudder pedal inputs remain the same as when the failure occurred

Question 33

Does the Stab Trim switch on the control wheel cause autopilot disconnection?

Answer 33

- With single AP engaged: YES | - With multiple APs engaged: control wheel switches inhibited

Question 34

What does the Alternate Flap Arm switch do?

Answer 34

- turns off primary and secondary mode | - arms alternate control mode

Question 35

If one flap group fails to secondary mode what happens to the remaining flap groups?

Answer 35

* The symmetrical flap group on the other wing will switch to secondary * LE Midspan and Inboard switch to secondary together *

Question 36

FLAP DRIVE EICAS message

Answer 36

- One or more flap groups fail to drive in secondary mode, or - asymmetry condition detected

Question 37

Purpose of Spoiler Mixers

Answer 37

Combine Speedbrake Lever and Control Wheel inputs allowing roll inputs to deflect spoiler panels up and down when Speedbrakes and ground spoilers are in use

Question 38

>STAB GREENBAND

Answer 38

Nose gear pressure switch disagrees with the calculated stabilizer green band

Question 39

Amber X on Flap Indication

Answer 39

- position sensor for flap has failed * when STBY Bus is the only AC source, left wing trailing edge flaps sensors are not powered (left outboard & left inboard) - amber X’s will be displayed

Question 40

Amber Solid Box/Crosshatch/Open Box on expanded flap indication

Answer 40

Amber Solid Box - drive unit inop with flap group retracted Amber Crosshatch - drive unit inop with flap group in transit Amber Open Box - drive unit inop with flap group extended