Flight Controls Overview Quiz

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Questions and Answers

What is the purpose of the aileron droop function?

To decrease lift on the part of the wing with no flaps.

To follow the contours of the wing and increase lift. (correct)

To increase drag on the wing.

To assist in controlling the pitch of the aircraft.

Which component is responsible for yaw control in aircraft?

Elevators

Rudder (correct)

Ailerons

Flaps

What happens during the re-centering mode of control surfaces?

Surfaces return to their neutral position. (correct)

Surfaces are deflected downwards.

Surfaces follow the surface deflection.

Surfaces are locked in position.

How are the ailerons controlled when the flaps are extended?

They are deflected downwards. Signup and view all the answers

When is mechanical control of the trim wheel primarily used?

On ground for take-off trim and as a back-up system in flight. Signup and view all the answers

What are the primary functions of the Pedal Feel and Trim Unit (PFTU)?

To provide artificial feel and trim function for the rudder. Signup and view all the answers

How many servo controls are there for the rudder?

Three Signup and view all the answers

What is the function of the THS in the aircraft?

To assist in pitch control. Signup and view all the answers

What is the purpose of the Pitch Trim Actuator (PTA)?

To control the THS hydraulic motors Signup and view all the answers

What should be checked on the EWD after releasing the PRIM P/BSWs?

F/CTL PRIM 1 PITCH FAULT warnings Signup and view all the answers

Before performing maintenance on the PTA, what must be done to the related hydraulic system?

Put it in a depressurized configuration Signup and view all the answers

Which warning message should be displayed on the EWD after the pitch trim control wheels are stopped?

F/CTL STAB CTL FAULT Signup and view all the answers

What characterizes the motors used in the Pitch Trim Actuator?

They are brushless Direct Current (DC) motors Signup and view all the answers

What is indicated when the OFF indications disappear after pressing the PRIM 2 and PRIM 3 P/BSWs?

The flight control system is operational Signup and view all the answers

What is the purpose of performing the BITE test of the Electrical Flight Control System (EFCS)?

To diagnose potential faults in the EFCS Signup and view all the answers

What action is necessary before conducting maintenance on the PTA?

Open and tag the circuit breakers for EDP and Electrical pumps Signup and view all the answers

What is the purpose of using the LEAK MEASUREMENT VALVES P/BSW?

To isolate the other servocontrol not being tested Signup and view all the answers

What action is recommended after isolating the servocontrol that has not been tested?

Close the area if no other servicing tasks are pending Signup and view all the answers

What is the first step in the procedure for testing the outboard aileron servocontrol?

Isolate the other servocontrol using the valves Signup and view all the answers

The procedure for the outboard aileron servocontrol is similar for?

Each of the outboard aileron servocontrols Signup and view all the answers

What should be done if other servicing tasks need to be completed?

Complete all tasks before proceeding with isolation Signup and view all the answers

In a line maintenance briefing, which aircraft models does the document refer to?

A320 family and A330-200/300 Signup and view all the answers

What must be emphasized when performing maintenance on the aileron?

The importance of using safe isolation practices Signup and view all the answers

Which of the following components is specifically dealt with in the maintenance briefing?

The aileron servocontrol Signup and view all the answers

What is the normal operational configuration of the elevator servocontrols?

The inboard servocontrol is in active mode and the outboard is in damping mode. Signup and view all the answers

How many computers are connected to each elevator servocontrol?

Two computers, one FCPC and one FCSC. Signup and view all the answers

In the event of a flight control computer failure, which mode will the outboard servocontrol revert to?

Damping mode for safety. Signup and view all the answers

What is the primary role of the elevator in flight controls?

To control the pitch attitude of the aircraft. Signup and view all the answers

Identify the correct statement about elevator servocontrols.

The inboard servocontrol is in active mode during normal operations. Signup and view all the answers

What does FCSC stand for in the context of elevator systems?

Flight Control System Computer. Signup and view all the answers

Which component is responsible for controlling the elevator's movement?

Servocontrols connected to flight computers. Signup and view all the answers

What happens to the elevator servocontrol when the aircraft is in normal flight?

The outboard servocontrol remains passive. Signup and view all the answers

What system monitors the flight control system for troubleshooting functions?

Onboard Maintenance System Signup and view all the answers

Which manual must safety procedures be applied from during aircraft maintenance?

Aircraft Maintenance Manual Signup and view all the answers

What principle describes the relationship between pilot input and aircraft response?

Control Law Signup and view all the answers

Which level of maintenance does the A330-200/300 technical training manual pertain to?

Level 2 & 3 Signup and view all the answers

In the context of maintenance, what does OMS stand for?

Onboard Maintenance System Signup and view all the answers

Which engine type is associated with the A330-200/300 in the provided information?

RR Trent 700 Signup and view all the answers

What is explicitly stated as part of the A330-200/300 technical training documentation?

Flight controls line maintenance briefing Signup and view all the answers

What date is associated with the flight controls line maintenance briefing?

November 20, 2008 Signup and view all the answers

What type of training purpose does the document serve?

For training purposes only Signup and view all the answers

What is NOT necessary to apply during aircraft maintenance?

Personal best practices Signup and view all the answers

What should be done before performing maintenance on the PTA?

Open and tag the circuit breakers related to the EDP and electrical pumps. Signup and view all the answers

Which warning messages should appear on the EWD during the deactivation procedure?

F/CTL STAB CTL FAULT and PRIM 1 PITCH FAULT Signup and view all the answers

What action should be taken with the pitch trim control wheels during the deactivation of the THS actuator?

Set them to the fully UP position. Signup and view all the answers

What does the appearance of the OFF indications after pressing the PRIM 2 and PRIM 3 P/BSWs signify?

Power has been successfully cut to the THS actuator motors. Signup and view all the answers

Which component controls the function of the THS hydraulic motors?

Pitch Trim Actuator (PTA) Signup and view all the answers

What must be verified on the EWD after releasing the PRIM 1, 2, and 3 P/BSWs?

The display of the F/CTL STAB CTL FAULT warning. Signup and view all the answers

What type of motors does the Pitch Trim Actuator (PTA) utilize?

Brushless Direct Current (DC) motors Signup and view all the answers

In the context of deactivating the THS actuator, what should be done with the hydraulic system?

Ensure it is in the depressurized configuration. Signup and view all the answers

What is the function of the Backup Control Module (BCM) when flight control computer failures occur?

To maintain yaw control Signup and view all the answers

What is the role of Backup Power Supplies (BPSs) in relation to the BCM?

They supply power from hydraulically driven motors Signup and view all the answers

How does the BCM affect the airplane's rudder system?

It transmits rudder pedal orders to the rudder Signup and view all the answers

What function do all spoilers fulfill when specific ground logic conditions are met?

Ground lift dump function Signup and view all the answers

Which component interfaces with the BCM to relay commands from the pilot?

Pedal Feel and Trim Unit (PFTU) Signup and view all the answers

What does the schematic depict regarding the relationship between actuators and the computer?

Actuators receive commands from the computer Signup and view all the answers

What is the main role of the BCM in terms of flight dynamics?

To fulfill dutch roll damping Signup and view all the answers

In what scenario are all spoilers able to function as speed brakes?

Upon landing approach only Signup and view all the answers

What is the primary function of the MLA in the A330-200/300?

To reduce structural loads on the outer wing surfaces Signup and view all the answers

How does the deflection of spoilers in the MLA relate to load factors?

It is proportional to load factors in excess of 2 g Signup and view all the answers

What mechanism is used to actuate each spoiler in the MLA system?

Electro-hydraulic servocontrols Signup and view all the answers

What compensatory action is taken when the MLA function is initiated?

A simultaneous elevator demand is applied Signup and view all the answers

What is indicated about the servocontrols of the spoilers?

All servocontrols are of the same size but vary in length of travel Signup and view all the answers

At what load factor does the deflection of the spoilers begin to take effect?

2 g Signup and view all the answers

What is the impact of the MLA on the bending moment of the wing?

It reduces the bending moment Signup and view all the answers

In the context of flight controls, what is the function of the spoilers when integrated with the MLA?

They work to redistribute lift across the wing Signup and view all the answers

What is the primary function of the Backup Control Module (BCM)?

Controlling aircraft yaw via the rudder Signup and view all the answers

Which component works alongside the Flight Control Data Concentrators (FCDCs)?

Flight Management Guidance and Envelope Computers Signup and view all the answers

What functions do the three FCPCs fulfill in the flight control system?

Both computation and execution of deflection orders Signup and view all the answers

Which flight control surface is exclusively controlled by the FCPCs?

Trim Wheel Signup and view all the answers

What happens in the event of a total loss of both FCPCs and FCSCs?

The rudder control is taken over by the Backup Control Module Signup and view all the answers

What role does the Centralized Maintenance System (CMS) play in the flight control architecture?

Recording and monitoring flight control systems Signup and view all the answers

Which of the following is TRUE regarding the relationship between FCPCs and FCSCs?

FCPCs and FCSCs interface and work together. Signup and view all the answers

What is the role of the trim wheel in relation to the THS?

It operates the THS mechanically if electronic control is lost. Signup and view all the answers

Which system is the primary interface for troubleshooting flight control functions?

Electronic Instrument System Signup and view all the answers

What is the significance of the servo loop configuration in flight controls?

To enhance the responsiveness of flight control inputs Signup and view all the answers

In MANUAL CONTROL MODE, which component processes roll inputs from the side stick?

Flight Control Primary Computers (FCPCs) Signup and view all the answers

What happens to the side sticks when the autopilot is engaged?

They are mechanically locked by a solenoid. Signup and view all the answers

During abnormal operations, how is the control functionality of the inner and outer servocontrols typically configured?

Inner in damping mode and outer in active mode Signup and view all the answers

What role does the master computer play in the aileron servocontrol system?

It calculates roll deflection orders. Signup and view all the answers

Which of the following correctly describes the configuration of the aileron servocontrols in autopilot mode?

Two computers handle the inboard aileron, while the outboard is controlled by one computer. Signup and view all the answers

What is a critical feature of the aileron servocontrols in normal operations?

The inner servocontrol of each aileron is primarily in damping mode. Signup and view all the answers

Which of the following statements about the interconnectivity of the servocontrols is true?

Both inboard aileron servocontrols are linked to the same FCPC. Signup and view all the answers

What condition might trigger a disengagement of the autopilot when force thresholds are overridden?

When pilot inputs exceed defined force thresholds. Signup and view all the answers

What mechanism is used to actuate the Trimmable Horizontal Stabilizer (THS)?

A ball screw jack powered by hydraulic motors Signup and view all the answers

What role does the feedback differential gearbox comparator serve in the THS control system?

It compares input signals for control adjustment Signup and view all the answers

What should be checked on the Electronic Wheel Display (EWD) after releasing the PRIM P/BSWs?

F/CTL STAB CTL FAULT warning message Signup and view all the answers

What is the function of the Pitch Trim Actuator's (PTA) electrical motors?

To control the THS hydraulic motors Signup and view all the answers

During operation with the electric pump, what does the pressure-maintaining device ensure?

The pressure-off brakes are released Signup and view all the answers

What indication shows that the deactivation of the THS actuator is successful?

OFF indications disappear on the P/BSWs Signup and view all the answers

How does the control valve respond when the THS actuator reaches the demanded position?

It decreases its opening to stop hydraulic flow Signup and view all the answers

What is the primary function of the mechanical control system of the THS?

To provide a backup in case of electrical failure Signup and view all the answers

What message should appear after performing the BITE test of the Electrical Flight Control System (EFCS)?

FCPC1 (2CE1)/WRG/THS ACTR CIRCUIT BREAKER TO FCPC 1 Signup and view all the answers

Which action must be performed before maintaining the PTA?

Depressurize the related hydraulic system Signup and view all the answers

During which stage should the pitch trim control wheels be set to the fully UP position?

Before releasing the PRIM 1, 2, and 3 P/BSWs Signup and view all the answers

Which type of motor is used in the Pitch Trim Actuator (PTA)?

Brushless Direct Current (DC) motors Signup and view all the answers

What does the OFF indication on the P/BSWs represent after the deactivation process?

Actuator is successfully deactivated Signup and view all the answers

What does the damping mode of the actuator specifically enable regarding control surface movements?

Ensures the actuator mirrors control surface movements Signup and view all the answers

Which component can indicate the status of an accumulator in the servo control system?

Accumulator sight indicator Signup and view all the answers

During the testing of the aileron servo control, what equipment is notably used?

Accumulator sight indicator and test finger Signup and view all the answers

What is the main purpose of the servo control system in flight controls?

To enhance stability and responsiveness of flight control surfaces Signup and view all the answers

What does ROLL D/O denote in the context of the A330-200/300 documentation?

Roll rate display output Signup and view all the answers

The G7508471 - G7UT0TU reference relates to which aspect of the A330-200/300?

Flight control design and specifications Signup and view all the answers

What is a significant characteristic of the aileron servo control during maintenance procedures?

It allows for individual testing of components. Signup and view all the answers

Which technical training manual is relevant for understanding the aileron servo control principles?

A330-200/300 Technical Training Manual Signup and view all the answers

What is the primary purpose of roll spoilers in the A330-200/300?

To assist in lateral control during turns Signup and view all the answers

In what situation are flight control warnings likely to display on the EWD?

Upon failure of the elevator servocontrol Signup and view all the answers

Which of the following is a requirement before performing maintenance on the THS actuator?

Deactivate the related hydraulic system Signup and view all the answers

What is the significance of the BITE test in the context of the Electrical Flight Control System?

To diagnose faults within the electrical system Signup and view all the answers

Which factor does NOT influence the functionality of the roll spoilers during flight?

Altitude of flight Signup and view all the answers

Which motors are utilized in the operation of the Pitch Trim Actuator?

Brushless DC motors Signup and view all the answers

What should be observed when the OFF indications disappear after pressing the PRIM 2 and PRIM 3 P/BSWs?

The trim system is fully engaged Signup and view all the answers

What is the impact of isolation on previously tested servocontrols during maintenance?

It ensures compliance with safety standards Signup and view all the answers

What characterizes the aileron servo-control actuator in active mode?

The solenoid valve is energized by the computer. Signup and view all the answers

In damping mode, what happens to the aileron servo-control actuator?

The solenoid valve is de-energized and the actuator is not pressurized. Signup and view all the answers

Which of the following describes a potential failure in the aileron servo-control system?

Complete pressure loss in the hydraulic system. Signup and view all the answers

What triggers the active mode of the aileron servo-control actuator?

Computer energizing the solenoid valve. Signup and view all the answers

When does the aileron control actuator revert to damping mode?

When the solenoid valve is de-energized or actuator pressure is low. Signup and view all the answers

What does the aileron servo-control actuator rely on to remain operational?

Ongoing computer commands and hydraulic pressure. Signup and view all the answers

How is the transition from active mode to damping mode initiated?

Loss of hydraulic pressure or de-energizing the solenoid valve. Signup and view all the answers

What would likely happen if the solenoid valve of the aileron actuator fails?

The actuator will shift to damping mode and remain non-responsive. Signup and view all the answers

What is the primary purpose of the solenoid valve in the aileron servo-control system?

To control the flow of hydraulic fluid to the actuator. Signup and view all the answers

What would indicate that the aileron servo-control actuator is in active mode?

There is an electrical signal from the computer energizing the solenoid valve. Signup and view all the answers

Study Notes

Flight Controls Overview

Most actuators are hydraulically powered, except for THS servo-motors which are electrically driven
Roll control is achieved using ailerons and spoilers
Pitch control is done by elevators and the Trimmable Horizontal Stabilizer (THS)
Yaw control is done by the rudder
The Pedal Feel and Trim Unit (PFTU) gives rudder pedal artificial feel, trim function and feedback movement
The trim wheel can also mechanically control the hydraulic motors, with priority over the electrical control
The trim wheel is used on the ground for setting the THS take-off trim and in flight as a backup system if the THS electrical control is lost

Servo Controls

There are two servocontrols for Ailerons: inboard and outboard, each wing, connected to a single hydraulic circuit
Ailerons have a droop function provided by all ailerons. This increases lift on the part of the wing with no flaps
There are three servo controls for the rudder, all are active at the same time
There is only one servo control per spoiler
There are three servo controls for the elevators: one inboard and one outboard per wing, each connected to a single hydraulic circuit.
In a normal configuration, the inboard servocontrol is in active mode while the outboard is in damping mode

Reconfiguration Priorities

The flight control system has reconfiguration priorities in case of electrical failure, computer failure or loss of hydraulic circuits
The following computers ensure the servo loop control: CMQ (Control Management and Quality), SA (System Architecture)

THS Actuator Deactivation

The Pitch Trim Actuator (PTA) controls the THS hydraulic motors
The PTA has three brushless direct current (DC) motors
Each electrical motor is connected to one FCPC (Flight Control Primary Computer)
To deactivate the motor, put the related hydraulic system in the depressurized configuration: open, safety and tag the circuit breakers related to the EDP and electrical pumps.
Ensure no hydraulic supply from a ground power cart
Press in PRIM 1, 2, and 3 P/BSWs (Pressure Bleed Shut-Off Valves)
Move the pitch trim control wheels to the fully UP position
Make sure pitch trim control wheels do not move
Check the EWD (Electronic Wiring Diagram) for the F/CTL STAB CTL FAULT warning message.
Perform the BITE (Built-In Test Equipment) test of the EFCS (Electrical Flight Control System) via the GND SCANNING command
Check for the subsequent maintenance message on the EWD: "FCPC1 (2CE1)/WRG/THS ACTR CIRCUIT BREAKER TO FCPC 1"
Press in PRIM 2 and 3 P/BSWs, the OFF indications disappear.

Outboard Aileron Servocontrol Deactivation

Use LEAK MEASUREMENT VALVES P/BSW to isolate the other servocontrol which has not to be tested.
Operate the side stick to move the aileron.
Repeat the procedure for both outboard aileron servocontrols.

Onboard Maintenance System (OMS)

The flight control system is monitored for maintenance and troubleshooting functions by the OMS
When doing maintenance, all safety procedures listed in the Aircraft Maintenance Manual (AMM) must be applied

Flight Control Architecture

Flight Control Primary Computers (FCPCs) and Flight Control Secondary Computers (FCSCs) control and monitor the ailerons, spoilers, elevators and rudder.
FCPCs control the trimmable horizontal stabilizer (THS) which can also be mechanically operated via the trim wheel.
The Backup Control Module (BCM) controls the aircraft yaw via the rudder in case of FCPC and FCSC failure.
The Backup Power Supplies (BPSs) provide electrical power to the BCM from two hydraulically driven motors.

System Overview

The FCPCs and FCSCs interface with the Electronic Instrument System, Centralized Maintenance System and the recording system.
The FCPCs and FCSCs perform two key functions:
- Compute surface deflection orders.
- Execute servoing of deflection orders.
The Pitch Trim Actuator (PTA) controls the THS hydraulic motors and has three brushless DC motors, each connected to a FCPC.

Flight Control Systems

In manual control mode, side stick roll transducers send inputs to the FCPCs and FCSCs.
In autopilot control mode, Flight Management Guidance and Envelope Computers (FMGECs) send guidance orders to the FCPCs.
When autopilot is engaged, side sticks are locked by a solenoid operated load threshold device.
The master computer (usually FCPC1) calculates the roll deflection orders and sends them to all FCPCs and FCSCs.
The computers servo the aileron and roll spoiler servocontrols.

Roll Spoilers

All spoilers are actuated by an electro-hydraulic servocontrol.
Each spoiler has a different travel length, but uses the same sized servocontrol.
The spoilers fulfill the speed brake function, and can also function as ground lift dump when specific conditions are met.

Aileron Control

Each aileron servocontrol is connected to two computers (one FCPC and one FCSC) for the inboard aileron, and one computer for the outboard aileron.
Aileron servocontrols have two modes: active and damping.
Normally, the outer servocontrol of each aileron is in active mode, and the inner servo control is in damping mode.

Maneuver Load Alleviation (MLA)

MLA redistributes lift over the wing to relieve structural loads, particularly on the outer wing surfaces.
MLA raises the ailerons and spoilers 4, 5, and 6 symmetrically, proportional to load factor exceeding 2g.
An elevator demand is simultaneously applied to compensate for the pitching moment induced by the spoilers and ailerons.

Deactivation of the THS Actuator Electrical Motor

The Pitch Trim Actuator (PTA) has three brushless Direct Current (DC) motors.
Each motor is connected to one FCPC.
Procedure for deactivation is the same for motors 2 and 3.
Before maintenance action put the related hydraulic system in the depressurized configuration.
Open, safety tag the circuit breakers related to the EDP and Electrical pumps.
Ensure there is no hydraulic supply from a ground power cart.
On the EWD, make sure the F/CTL PRIM 1 PITCH FAULT warnings are shown.
Release out PRIM 1, 2 and 3 P/BSWs on the two F/CTL panels.
The OFF indications will come on.
Move the pitch trim control wheels located on the center pedestal to the fully UP position.
Press in PRIM 1 P/BSW on FLT/CTL section of panel 241VU.
Ensure the pitch trim control wheels do not move.
On the EWD check that the F/CTL STAB CTL FAULT warning message comes on.
Conduct a BITE test of the Electrical Flight Control System (EFCS) via the GND SCANNING command.
Ensure the subsequent maintenance message is shown: FCPC1 (2CE1)/WRG/THS ACTR CIRCUIT BREAKER TO FCPC 1, as the circuit breaker for THS actuator motor 1 is open.
Press in PRIM 2 and PRIM 3 P/BSWs. The OFF indications will disappear.

Aileron Servo Control Principles - Active Mode

The aileron servo-control actuator is pressurized.
The solenoid valve is energized by the computer.

Aileron Servo Control Principles - Damping Mode

The solenoid valve is de-energized.
The servo-control actuator is not pressurized.
The actuator follows the control surface movements.

Aileron Servo Control Principles - Test/Adjustment

The accumulator and internal valves can be tested using the accumulator sight indicator and a test finger.

Trimmable Horizontal Stabilizer (THS)

The THS is attached to a ball nut actuated by a ball screw jack.
It is powered by two hydraulic motors linked through a differential.
The ball screw jack has a fail safe design with a double load path.

THS Mechanical Control

THS mechanical control can be used on ground for maintenance or take off trim setting.
It can be used in flight as a standby system if automatic control (autotrim) is not available.
When an input is made, the feedback differential gearbox comparator compares the input with the movement of the ball screw jack (feedback gear).
The difference between the two mechanical signals is shown as the control differential output.
The control differential output moves the control valve.
The control valve opens and lets hydraulic fluid go into the hydraulic motors.
Both hydraulic motors operate at the same time driving the ball screw jack which moves the THS.
When the THS actuator gets to the demanded position the feedback gear moves the control differential input decreasing the control valve opening.
The control valve closes and stops the hydraulic flow to the motors.
The ball screw jack stops at the commanded position.
During operation with Electric pump, when the flow rate is low, the pressure maintaining device keeps the pressure-off brakes released.

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Description

Test your knowledge on flight controls and servo mechanisms with this quiz. Topics include hydraulic and electrical actuation, roll, pitch, and yaw control systems, as well as trim functionality. This quiz is essential for understanding aircraft control systems.