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Questions and Answers
Which control surfaces are electronically controlled by Fly By Wire?
Which control surfaces are electronically controlled by Fly By Wire?
Elevators, rudder, multi-function spoilers (for roll control)
What components operate the Fly-By-Wire electronic control system?
What components operate the Fly-By-Wire electronic control system?
4 X Flight Control Modules (FCM), 3 X Primary Actuator Control Units (P-ACE), 2 X Slat/Flap Actuator Control Electronics (SF-ACE), 1 X Horizontal Stab Actuator Control Electronics (HS-ACE), 3 X Spoiler Actuator Control Electronics (S-ACE)
True or False: The ailerons are fly-by-wire.
True or False: The ailerons are fly-by-wire.
False
What are the components of the FBW's dedicated backup system?
What are the components of the FBW's dedicated backup system?
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If the FBW system loses normal and emergency electrical power, for how long will the dedicated backup system provide power?
If the FBW system loses normal and emergency electrical power, for how long will the dedicated backup system provide power?
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Which system provides the aircraft attitude and acceleration information to FCMs for AOA-limiting function calculations?
Which system provides the aircraft attitude and acceleration information to FCMs for AOA-limiting function calculations?
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Which system provides TLA to the FCMs for use in elevator thrust compensation?
Which system provides TLA to the FCMs for use in elevator thrust compensation?
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Which system provides wheel speed signals for use in ground spoiler deployment?
Which system provides wheel speed signals for use in ground spoiler deployment?
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Which system provides autopilot commands?
Which system provides autopilot commands?
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Which two modes of operation does the flight control system have?
Which two modes of operation does the flight control system have?
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How is DIRECT mode triggered, and what conditions are unavailable in DIRECT mode?
How is DIRECT mode triggered, and what conditions are unavailable in DIRECT mode?
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True or False: In Direct mode, the FCM provides software-based airspeed gain schedules and control limits to the P-ACE units.
True or False: In Direct mode, the FCM provides software-based airspeed gain schedules and control limits to the P-ACE units.
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True or False: In Normal mode, the FCM provides software-based airspeed gain schedules and control limits to the P-ACE units.
True or False: In Normal mode, the FCM provides software-based airspeed gain schedules and control limits to the P-ACE units.
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The following high-level functions are available in normal mode EXCEPT _______.
The following high-level functions are available in normal mode EXCEPT _______.
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True or False: Only the rudder and elevator have elevator thrust compensation function.
True or False: Only the rudder and elevator have elevator thrust compensation function.
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Study Notes
Flight Control Surfaces
- Primary Flight Controls consist of elevators, rudder, and multi-function spoilers for roll control.
- Secondary Flight Controls include flaps, slats, multi-function spoilers (as ground spoilers), and ground spoilers.
- Ailerons utilize a conventional mechanical cable, connecting to Power Control Units (PCUs).
Fly-By-Wire Components
- Four Flight Control Modules (FCM) manage flight control data.
- Three Primary Actuator Control Units (P-ACE) operate primary controls.
- Two Slat/Flap Actuator Control Electronics (SF-ACE) handle slats/flaps.
- One Horizontal Stab Actuator Control Electronics (HS-ACE) is present.
- Three Spoiler Actuator Control Electronics (S-ACE) are also utilized.
Aileron Control
- Ailerons operate via mechanical cables linked to the control wheel and autopilot, not by Fly-By-Wire.
Backup Power System
- A dedicated backup system includes a battery, distribution bus, and circuit breakers.
- This system supplies power to elevator/rudder actuators for up to 15 minutes.
Inertial Reference System
- The Inertial Reference System (IRS) provides aircraft attitude and acceleration data critical for Angle of Attack (AOA) limiting calculations.
Elevator Thrust Compensation
- Full Authority Digital Engine Control (FADEC) adjusts elevator deflection based on Thrust Lever Angle (TLA), allowing for a maximum 5-degree delta.
- Essential inputs for elevator thrust compensation calculations include N1, Mach Number, and Pressure Altitude.
Ground Spoiler Deployment
- Wheel speed signals for ground spoiler deployment come from Brake Control Modules (BCMs).
Autopilot System
- The Automatic Flight Control System (AFCS) is responsible for autopilot command execution.
Flight Control Modes
- Two operational modes exist: NORMAL and DIRECT.
- DIRECT mode activates during failures that disconnect FCMs from P-ACE units or when a guarded button on the Flight Controls Mode panel is pressed.
Characteristics of DIRECT Mode
- In DIRECT mode, flight control deflections appear in AMBER on the Flight Controls Synoptic Page.
- Spoilers, elevators, and rudders operate on default controls set by P-ACE hardware without software-based limits.
- No airspeed gain information is provided to P-ACE units during DIRECT mode.
NORMAL Mode Functions
- In NORMAL mode, FCMs provide software-based airspeed gain scheduling and control limits.
- Available functions include airspeed gain scheduling, auto-thrust compensation, AOA limiting, yaw damper/turn coordination, rudder flight authority, and configuration change compensation.
- Only rudders and elevators feature auto-thrust compensation capabilities.
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Description
Test your knowledge of flight controls with these flashcards. Focus on understanding the primary and secondary flight controls, including electronic systems like Fly By Wire. Prepare for in-depth discussions on the functionalities of various control surfaces.
