Flight Controls

Question 1

Stabilizer Trim Cut Out Switches - Cut out

Answer 1

Shuts off the respective center or right (left or center -767) hydraulic system power to the related
stabilizer trim control module

Question 2

Speed Brake Light (amber)

Answer 2

Speedbrakes extended and:
• Flaps are in a landing position, or
• Radio altitude is 800 feet or below

Question 3

Flap Lever Positions (757)

Answer 3

1 -
• Slats extend to the midrange (takeoff) position
• Flaps extend to 1

5, 15 AND 20 -
• Slats remain in the midrange position
• Flaps extend to the commanded position
- Flap Gate at 20

25 -
• Slats extend to the fully extended (landing) position
• Flaps extend to 25

30 -
• Slats remain in the fully extended (landing) position
• Flaps extend to 30
• Flap load relief system arms

Question 4

Leading Edge/Trailing Edge Light (amber)

Answer 4

• Flap disagree exists
• Flap asymmetry exists
• Flap load relief system is not operating when required (Trailing Edge)

Question 5

Alternate Flaps Arms Switches

Answer 5

ALTN -
• Arms the selected LE slat or TE flap alternate drive unit
• Shuts off hydraulic power to both the flap and slat drive systems (757)

• Shuts off hydraulic power to the selected LE slat or TE flap drive systems (767)

Question 6

How is control maintains if flight controls are jammed

Answer 6

pilots can maintain control by applying force to the other column or wheel
to overcome the jam

Question 7

How many flight control surfaces (pitch, roll, yaw)

Answer 7

Pitch:

• 2 elevators
• movable horizontal stabilizer

Roll:

• two ailerons
• 12 x spoilers (2 for ground use only)

Yaw:
- single rudder

Question 8

How are elevators controlled?

Answer 8

• control column signals hydraulic actuators (R,L,C/C,L,R) to move elevator surfaces
• elevator feel units powered by center and right (left and center - 767) HYD systems
  
  • mechanical springs as back up

Question 9

How many modes of horizontal stabilizer control?

Answer 9

3
• Electric
• Alternate
• Automatic

Question 10

How is stabilizer trim controlled?

Answer 10

• powered by center and right (left and center -767) hydraulic systems
• trim switches send position commands to horizontal trim control modules (2)

Question 11

When is the horizontal stabilizer automatically trimmed

Answer 11

• by autopilot when engaged
• Mach speed trim system when AP not engaged (improves speed stability by trimming stabilizer as speed changes)
• only one trim control module and trims at one-half normal rate

Question 12

How is roll controlled? (757)

Answer 12

• Control wheel signals actuators (two actuators per aileron - R,C/C,L) to move single aileron surface on each wing
• spoilers also extend to augment roll control

Question 13

How is yaw controlled? (757)

Answer 13

• Single rudder surface driven by 3 actuators

- each actuator driven by a different hydraulic system

Question 14

Rudder Ratio System

Answer 14

• protects the rudder surface by desensitizing pilot input and reducing deflection as airspeed increases
• receives ADC inputs and controls an actuator to dampen pilot input
• actuator powered by left hydraulic system

Question 15

Yaw Damper system

Answer 15

• 2 yaw dampers

- controlled by L and C hydraulic systems

Question 16

When do Spoilers automatically move to UP?

Answer 16

ARMED:

• landing gear fully on the ground (no tilt)
• thrust levers idle

Not ARMED:

• landing gear fully on the ground
• thrust levers moved to idle detent

Question 17

SPEEDBRAKES light/SPEEDBRAKES EXT EICAS

Answer 17

Speedbrakes extended, and:

• flaps in landing position, or
• below 800’ RA

Question 18

How many spoiler panels and which are used for air/ground purposes?

Answer 18

12 total spoiler panels(6 per wing) - 1,2,3,4-5,6 7,8-9,10,11,12
4 and 9 are for ground use only

Question 19

How are Slats/Flaps driven (757)

Answer 19

• two power drive units (PDUs)
• one for dedicated to slats and one dedicated to flaps
• powered by left hydraulic system

Question 20

Purpose of Autoslats

Answer 20

• enhance aircraft stall characteristics

- if signal from stall warning system received slats automatically extend from midrange to full

Question 21

Selecting ALT Flap switches

Answer 21

• Disable normal control
• Arm the alternate mode
• Engage the electric motors
• Flap lever no longer controls flaps/slats
• Allow independent selection of either flaps or slats (767)
• limited to Flaps 20
• flap load relieve, autoslats, and asymmetry protection are not avail

Question 22

Which EICAS messages would have hydraulic power to both flaps and slats shutoff?

Answer 22

LE SLAT DISAGREE, TE FLAP DISAGREE, LE SLAT ASYM, and TE FLAP ASYM

Question 23

Flap Lever Positions (767)

Answer 23

UP - Slats and flaps are retracted

1 -
• Slats extend to the midrange (takeoff) position
• Flaps remain retracted

5 -
• Slats remain in the midrange (takeoff) position
• Flaps extend to the commanded position
• Inboard ailerons droop in conjunction with flap extension from 1 to 5 degrees

15 AND 20 -
• Slats remain in the midrange (takeoff) position
• Flaps extend to the commanded position
- Flap Gate at 20 for Go-Around protection

25 -
• Slats extend to the fully extended (landing) position
• Flaps extend to 25
• Flap load relief system is armed

30 -
• Slats remain in the fully extended (landing) position
• Flaps extend to 30

Question 24

How is Roll Controlled (767)

Answer 24

• Four ailerons (2 x inboard, 2 x outboard)

- 12 x spoilers (all for ground and air use)

Question 25

What is Pitch Enhancement System (767)

Answer 25

- activates if left and center hydraulic systems are lost in flight - hydraulic motor uses trapped left system trim fluid to operate stabilizer - only electronic trim avail at 1/4 rate

Question 26

Aileron Lockout (767)

Answer 26

- permits full travel of the outboard ailerons at low speeds and locks out the outboard ailerons at high speeds - outboard aileron lockout at 280 knts - outboard aileron unlock at 240 knts

Question 27

Flap Load Relief

Answer 27

757: If Flap placard speed is exceeded in Pos 30 (162)…flaps auto retract to 25 767: If Flap placard speed is exceeded in Pos 25 (180) or 30 (170)…flaps auto retract to 20

Question 27

Speedbrake Load Alleviation system - LAS (767)

Answer 27

Activated in flight: • Flaps are UP • Gross weight is greater than 340,000 lbs • Indicated airspeed is greater than 320 knots - restricts speedbrake to 50%

Question 28

What happens to roll control during a loss of center hydraulics and a loss of either left or right hydraulics?

Answer 28

- an unpowered, floating aileron | - May result in undesirable lateral yoke displacement to maintain wings level

Question 29

AIL LOCK Amber message (767)

Answer 29

Aileron lockout actuator not in signaled position − At high speed, avoid abrupt control wheel inputs − At low speed, roll rates may be reduced

Question 30

Stab Trim Rates

Answer 30

Full: Normal or alternate stabilizer trim activated during manual flight One-Half: − Autopilot engaged – or – − One trim motor inoperative One-Quarter: PES operating (767)