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Boeing 777-200 Systems > Flight Controls > Flashcards

Flight Controls Flashcards

1
Q

What drives the primary flight control surfaces?

A

Power control units (PCUs) drive the primary flight control surfaces.

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2
Q

How many spoilers are there?

A

14 spoilers, 7 on each wing

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3
Q

Roll control is provided by?

A

2 ailerons, 2 flaperons

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4
Q

High lift control system contains?

A
  • 7 slats (on the leading edge of each wing)
  • 2 Krueger flaps
  • 2 outboard trailing edge flaps
  • 2 inboard trailing edge flaps
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5
Q

What are the 3 primary flight control system modes of operation?

A
  • Normal
  • Secondary
  • Direct
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5
Q

How are control inputs made in the 777 fly-by-wire system?

A
  • Inputs through the control column, wheel, rudder pedals and speedbrake lever are converted to analog electrical signals.
  • These analog signals go to 4 Actuator Control Electronics (ACEs), convert analog signals to digital signals.
  • Digital signals from the ACEs are sent to 3 Primary Flight Computers (PFCs).
  • From various airplane systems, the PFCs receive Airspeed data, Inertial data, Angle of attack data, Flap position data.
  • PFCs calculate the flight control position commands requested by the pilot and sends them back to the ACEs.
  • ACEs convert the digital signals back to analog form and sends them to the flight control surface actuators.
  • The actuators provide the muscle to operate the flight controls.
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5
Q

When does the primary flight control system automatically switch to the Secondary Mode?

A
  • Internal failure
  • Lack of information detected from other systems
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5
Q

What is not available in the Secondary Mode?

A
  • Autopilot
  • Auto speed brakes
  • Envelope protection
  • Tail strike protection
  • Thrust Asymmetry Compensation
  • Yaw Damping
  • Other protection features
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6
Q

What are the 2 ways the primary flight control system can be switched to the Direct Mode?

A
  • Automatically if all 3 PFCs fail
  • Manually, by selecting DISC on the PRIMARY FLIGHT COMPUTERS switch.
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7
Q

What functions are not available in the Direct Mode?

A
  • Autopilot
  • Manual rudder trim cancel switch
  • Auto speed brakes
  • Thrust Asymmetry Compensation (TAC)
  • Envelope protection
  • Yaw damper
  • Gust suppression
  • Tail strike protection
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8
Q

What does the green band on the stabilizer position indicator indicate?

A

The illuminated green band, computed by the FMC, displays the allowable range of the stabilizer for takeoff.

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9
Q

The green band on the stabilizer position indicator is positioned by the FMC and is based on?

A
  • Gross weight
  • Takeoff thrust
  • CG information
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10
Q

When does the green band on the stabilizer position indicator default to the midrange?

A
  • No information is available
  • V1 is not selected or entered
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11
Q

When is the green band and the pointer on the stabilizer position indicator not displayed?

A

If the stabilizer signal is not present or is invalid.

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12
Q

Flight envelope protection features include?

A
  • Stall protection for pitch
  • Overspeed protection for pitch
  • Bank angle protection for roll
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13
Q

Yaw control is provided by?

A
  • Rudder pedals
  • Rudder trim system
  • Rudder ratio system
  • Yaw dampers
14
Q

When does automatically add rudder to minimize yaw during an engine failure?

A

When engine thrust differs by more than 10%.

15
Q

When does TAC automatically disengage?

A
  • Engine thrust data is lost
  • Engine is damaged
  • Engine surges
16
Q

When is TAC not available?

A
  • Airspeed is below 70 knots on the ground
  • Reverse thrust is applied
  • Automatically disengaged due to system malfunctions
  • Loss of engine thrust data
  • Flight controls are in secondary or direct modes
17
Q

What is the purpose of the control wheel/rudder cross-tie?

A

Enables the pilot to control initial asymmetry solely through control wheel inputs.

17
Q

When is the wheel to rudder cross-tie operative?

A

In the normal mode, wheel to rudder cross-tie is operative in flight below 210 knots.

17
Q

What are the 3 modes of operation for the flaps and slats?

A
  • Primary
  • Secondary
  • Alternate
18
Q

In primary mode, flap load relief operates for flap selections?

A

15 - 30

19
Q

When does the secondary mode automatically engage?

A
  • Primary flap or slat mode fails
  • The center hydraulic system fails
20
Q

On the ground, secondary electric mode extension or retraction is inhibited when?

A
  • Groundspeed is less than 40 knots
  • Center hydraulic system pressure is low
  • And two of the following three conditions are met:
    • Left engine N2 is less than 50 percent
    • Right engine N2 is less than 50 percent
    • Primary external power is available
21
Q

What happens when the ALTN FLAPS ARM switched to ARM?

A
  • Arms the alternate flap control mode
  • Arms the alternate flap selector
  • Disables primary and secondary flap/slat operation
  • Flap lever is inoperative
22
Q

What is not available in the alternate mode?

A
  • Asymmetry protection
  • Uncommanded motion protection
  • Autoslats
  • Flap/slat load relief
23
Q
A

Boeing 777-200 Systems (21 decks)

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