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Boeing 757/767 > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

Stabilizer Trim Cut Out Switches - Cut out

A

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

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2
Q

Speed Brake Light (amber)

A

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

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3
Q

Flap Lever Positions (757)

A

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

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4
Q

Leading Edge/Trailing Edge Light (amber)

A
  • Flap disagree exists
  • Flap asymmetry exists
  • Flap load relief system is not operating when required (Trailing Edge)
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5
Q

Alternate Flaps Arms Switches

A

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)

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6
Q

How is control maintains if flight controls are jammed

A

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

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7
Q

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

A

Pitch:

  • 2 elevators
  • movable horizontal stabilizer

Roll:

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

Yaw:
- single rudder

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8
Q

How are elevators controlled?

A
  • 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
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9
Q

How many modes of horizontal stabilizer control?

A

3
• Electric
• Alternate
• Automatic

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10
Q

How is stabilizer trim controlled?

A
  • powered by center and right (left and center -767) hydraulic systems
  • trim switches send position commands to horizontal trim control modules (2)
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11
Q

When is the horizontal stabilizer automatically trimmed

A
  • 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
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12
Q

How is roll controlled? (757)

A
  • 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
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13
Q

How is yaw controlled? (757)

A
  • Single rudder surface driven by 3 actuators

- each actuator driven by a different hydraulic system

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14
Q

Rudder Ratio System

A
  • 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
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15
Q

Yaw Damper system

A
  • 2 yaw dampers

- controlled by L and C hydraulic systems

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16
Q

When do Spoilers automatically move to UP?

A

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
17
Q

SPEEDBRAKES light/SPEEDBRAKES EXT EICAS

A

Speedbrakes extended, and:

  • flaps in landing position, or
  • below 800’ RA
18
Q

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

A

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

19
Q

How are Slats/Flaps driven (757)

A
  • two power drive units (PDUs)
  • one for dedicated to slats and one dedicated to flaps
  • powered by left hydraulic system
20
Q

Purpose of Autoslats

A
  • enhance aircraft stall characteristics

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

21
Q

Selecting ALT Flap switches

A
  • 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
22
Q

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

A

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

23
Q

Flap Lever Positions (767)

A

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

24
Q

How is Roll Controlled (767)

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

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

25
Q

What is Pitch Enhancement System (767)

A
  • 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
26
Q

Aileron Lockout (767)

A
  • 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
27
Q

Flap Load Relief

A

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

27
Q

Speedbrake Load Alleviation system - LAS (767)

A

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%
28
Q

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

A
  • an unpowered, floating aileron

- May result in undesirable lateral yoke displacement to maintain wings level

29
Q

AIL LOCK Amber message (767)

A

Aileron lockout actuator not in signaled position

− At high speed, avoid abrupt control wheel inputs
− At low speed, roll rates may be reduced

30
Q

Stab Trim Rates

A

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

Boeing 757/767 (19 decks)

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