Podcast
Questions and Answers
How many backup power sources (BPS) are present for electrical backup in the system?
How many backup power sources (BPS) are present for electrical backup in the system?
The THS (Tail Horizontal Stabilizer) can be operated by all 3 motors simultaneously.
The THS (Tail Horizontal Stabilizer) can be operated by all 3 motors simultaneously.
False
In the normal law, the full flaps position results in a ____ degree angle.
In the normal law, the full flaps position results in a ____ degree angle.
47
What does the SSU (Spoileron Control Unit) control to reduce speed and increase drag?
What does the SSU (Spoileron Control Unit) control to reduce speed and increase drag?
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Match each component with its location in the system:
Match each component with its location in the system:
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What is the primary function of FCDC in the electrical flight control system?
What is the primary function of FCDC in the electrical flight control system?
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What happens when all four FCCs fail?
What happens when all four FCCs fail?
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What is the architecture of the aileron in the electrical flight control system?
What is the architecture of the aileron in the electrical flight control system?
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What is the normal operation mode of the THS?
What is the normal operation mode of the THS?
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What is the purpose of the GND spoiler?
What is the purpose of the GND spoiler?
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What is the function of the red button on the SSU?
What is the function of the red button on the SSU?
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What is the location of the PRIM 1 and SEC units?
What is the location of the PRIM 1 and SEC units?
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How many spoilers are present in the system?
How many spoilers are present in the system?
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What is the function of the sidestick during autopilot mode?
What is the function of the sidestick during autopilot mode?
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What is the primary function of the FCDC in the electrical flight control system?
What is the primary function of the FCDC in the electrical flight control system?
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What happens when all four FCCs fail?
What happens when all four FCCs fail?
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What type of architecture does the aileron have in the electrical flight control system?
What type of architecture does the aileron have in the electrical flight control system?
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What is the purpose of the BITE system with CMS?
What is the purpose of the BITE system with CMS?
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What is the function of the sidestick during normal operation?
What is the function of the sidestick during normal operation?
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What is the location of the CPIOM 1 and 2 units?
What is the location of the CPIOM 1 and 2 units?
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What is the purpose of the red button on the SSU?
What is the purpose of the red button on the SSU?
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How many spoilers are present in the system?
How many spoilers are present in the system?
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What is the purpose of the GND spoiler?
What is the purpose of the GND spoiler?
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Study Notes
Electrical Flight Control
- FCDC concentrates data from FCC, FCU, and BCM, displays and records it, and has FWS and BITE with CMS.
- Electrical backup has 4 BPS and 1 BCM unit; if 4 FCC failures occur, backup is automatically activated, removing inhibition signals to the BPS.
Primary Flight Controls
Aileron Architecture
- Aileron has 1 convent and 1 electro-static device.
Elevator
- The elevator is normally driven by the S/C and an EHA.
Rudder
- The rudder has 2 EBHA units.
THS
- THS is operated by THSA and can be driven by 1 of 3 motors; normally, 1 hydraulic motor is active, and the other is on standby; both hydraulic motors can work together for higher performance; in case of loss of 2 hydraulic motors, an electrical motor takes over.
Spoiler
- There are 5 spoilers: 1 EBHA and 4 S/C units; Spoiler 2 is linked to PRIM 1 and SEC; spoiler control uses SSU and speed brake toggle switches to reduce speed by increasing drag.
Control and Indications
Sidestick
- The sidestick is spring-loaded to a neutral position and is not mechanically coupled; with autopilot, it is locked in a neutral position; pressing the red button on SSU gives priority and flashes the sidestick priority.
Trim
- Trim is set before flight and then becomes automatic.
Spoiler
- GND spoiler is used in case of touch down, landing, etc. to prevent jumping; in Normal law, spoilers are used.
High Lift
- High lift mode uses a torque shaft transmission to transmit PCU power to 8 down drive gear boxes simultaneously; flaps have 5 positions (0, 1, 2, 3, full) with a maximum angle of 47°.
PCU
- PCU has 2 motors coupled by a differential gearbox; one motor can drive the system at half speed; if failures occur, power is cut off to brakes in PCU and WTB to prevent flaps asymmetry.
Component PCU
- TSSU ensures the same speed for comparison; in case of different speeds, WTB is used.
- Feedback position pick-off unit provides the position of the flap.
Control and Indications
- Baulk prevents unwanted pull-back.
Location
- PCU is located in the center wing box.
Electrical Flight Control
- FCDC (Flight Control Data Concentrator) concentrates data from FCC (Flight Control Computer), FCU (Flight Control Unit), and BCM (Bus Communication Module) and displays and records this data.
Electrical Backup
- 4 BPS (Backup Power Supply) units and 1 BCM unit provide electrical backup.
- If 4 FCC failures occur, the backup system is automatically activated, removing inhibition signals to the BPS.
Location
- PRIM 1, PRIM 2, and SEC (Secondary) units are located at 1-100VU, 1-200VU, and 1-300VU respectively.
- CPIOM (Centralized Processing and Input-Output Module) 1 and 2 are located at 1000VU.
Primary Flight Controls
- Aileron architecture consists of 1 conventional and 1 electro-static servo.
- Elevator is normally driven by S/C (Servo-Control) and an EHA (Electro-Hydrostatic Actuator).
- Rudder has 2 EBHA (Electro-Backup Hydraulic Actuator) units.
- THS (Tail Horizontal Stabilizer) is operated by THSA (Tail Horizontal Stabilizer Actuator) and can be driven by 1 of 3 motors.
Spoilers
- 5 spoilers: 1 EBHA and 2, 3, 4, and 5 S/C units.
- Spoiler 2 is linked to PRIM 1 and SEC.
- Spoiler control: SSU (Spoiler-Side-Stick Unit) and speed brake toggle switches reduce speed by increasing drag.
Control and Indications
- Sidestick is spring-loaded to neutral position and is not mechanically coupled.
- Autopilot locks sidestick in neutral position.
- Red button on SSU gives priority and flashes sidestick priority.
- Moving ailerons, spoilers, etc. information is displayed on the F/CTL page.
Trim
- Trim is set before flight but auto-trims after takeoff.
Spoiler
- Ground spoiler: prevents jumping during landing and other ground operations.
Electrical Flight Control
- FCDC (Flight Control Data Concentrator) concentrates data from FCC (Flight Control Computer), FCU (Flight Control Unit), and BCM (Bus Communication Module) and displays and records this data.
Electrical Backup
- 4 BPS (Backup Power Supply) units and 1 BCM unit provide electrical backup.
- If 4 FCC failures occur, the backup system is automatically activated, removing inhibition signals to the BPS.
Location
- PRIM 1, PRIM 2, and SEC (Secondary) units are located at 1-100VU, 1-200VU, and 1-300VU respectively.
- CPIOM (Centralized Processing and Input-Output Module) 1 and 2 are located at 1000VU.
Primary Flight Controls
- Aileron architecture consists of 1 conventional and 1 electro-static servo.
- Elevator is normally driven by S/C (Servo-Control) and an EHA (Electro-Hydrostatic Actuator).
- Rudder has 2 EBHA (Electro-Backup Hydraulic Actuator) units.
- THS (Tail Horizontal Stabilizer) is operated by THSA (Tail Horizontal Stabilizer Actuator) and can be driven by 1 of 3 motors.
Spoilers
- 5 spoilers: 1 EBHA and 2, 3, 4, and 5 S/C units.
- Spoiler 2 is linked to PRIM 1 and SEC.
- Spoiler control: SSU (Spoiler-Side-Stick Unit) and speed brake toggle switches reduce speed by increasing drag.
Control and Indications
- Sidestick is spring-loaded to neutral position and is not mechanically coupled.
- Autopilot locks sidestick in neutral position.
- Red button on SSU gives priority and flashes sidestick priority.
- Moving ailerons, spoilers, etc. information is displayed on the F/CTL page.
Trim
- Trim is set before flight but auto-trims after takeoff.
Spoiler
- Ground spoiler: prevents jumping during landing and other ground operations.
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Description
This quiz covers the electrical systems that control flight, including flight control computers, backup systems, and primary flight controls such as aileron, elevator, and rudder architectures.
