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  • A350 TECHNICAL TRAINING MANUAL

    MAINTENANCE COURSE - T1+T2 - RR Trent XWB Flights Controls

  • This document must be used for training purposes only

    Under no circumstances should this document be used as a reference

    It will not be updated.

    All rights reservedNo part of this manual may be reproduced in any form,

    by photostat, microfilm, retrieval system, or any other means,without the prior written permission of AIRBUS S.A.S.

    AIRBUS Environmental RecommendationPlease consider your environmental responsability before printing this document.

  • FLIGHTS CONTROLSPrimary Flight Control System (PFCS) Description (2/3) . . . . . . . . . . 2PFCS Computers Group Description (3) . . . . . . . . . . . . . . . . . . . . . . 12PFCS Lateral Function Description (3) . . . . . . . . . . . . . . . . . . . . . . . 36PFCS Vertical Function Description (3) . . . . . . . . . . . . . . . . . . . . . . . 52Speed Brakes and Ground Spoilers Description (3) . . . . . . . . . . . . . . 64PFCS Backup System Description (3) . . . . . . . . . . . . . . . . . . . . . . . . 76Primary Flight Control System (PFCS) Control and Indicating

    (2/3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82Primary Flight Control System (PFCS) Maintenance (2/3) . . . . . . . . 94High Lift System (HLS) Control Inputs Description (3) . . . . . . . . . 104Slat and Droop Nose Description (3) . . . . . . . . . . . . . . . . . . . . . . . . 108Flaps Description (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128Aircraft Performance Optimization Description (3) . . . . . . . . . . . . . 158Protection Laws Description (3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166High Lift System (HLS) Control and Indicating (2/3) . . . . . . . . . . . 170High Lift System (HLS) Maintenance (2/3) . . . . . . . . . . . . . . . . . . . 176

    MAINTENANCE COURSE - T1+T2 - RR Trent XWB 27 - Flights Controls

    TABLE OF CONTENTS Oct 21, 2013Page 1

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  • PRIMARY FLIGHT CONTROL SYSTEM (PFCS) DESCRIPTION (2/3)PFCS

    IntroductionThe Primary Flight Control System (PFCS) includes all the controlsurfaces such as ailerons, spoilers, elevators, rudder and TrimmableHorizontal Stabilizer (THS) and their related computers, componentsand functions.The PFCS controls the A/C in the roll, yaw and pitch axis from a pilotorder (in manual mode) or from the Autopilot (AP) (in auto mode).The PFCS also controls the lift on the wing which includes speedbrake and ground spoiler functions.The PFCS is classified by control axis. Control axis are divided into:- Lateral functions (roll and yaw)- Vertical function (pitch).

    MAINTENANCE COURSE - T1+T2 - RR Trent XWB 27 - Flights Controls

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  • PFCS - INTRODUCTION

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  • PRIMARY FLIGHT CONTROL SYSTEM (PFCS) DESCRIPTION (2/3)PFCS (continued)

    PFCS architectureThe PFCS has three blocks:- Control inputs- The computer group- The actuation group.The control inputs include the pilot inputs that follow:- Side-sticks- Rudder pedals- Speed brake control-lever- Pitch trim and rudder trim panel- Computer P/BSWs.The computer group includes different computers:- PRIMary computer (PRIM)- SECondary computer (SEC)- Backup Control Module (BCM)- Flight Control Data Concentrator (FCDC) applications- Independent sensors (6 Rate Gyro and Accelerometer Units(RGAUs)).The PRIM and SEC computers receive demand inputs from the pilotside-sticks or from the Flight Control Unit (FCU)/Flight ManagementComputer (FMC).The A/C response and attitude is sent to the PRIMs and SECs by theAir Data/Inertial Reference Units (ADIRUs) and RGAUs.Based on the demand inputs and A/C attitude, the computers sendcontrol surface orders to the actuation group.The actuation group includes actuators and flight control surfaces forthe ailerons, spoilers, THS, elevators and rudder.Note that the communication between the PRIM and the SEC is donethrough ARINC 429 links but the communication between thecomputers and the actuation group and the RGAUs is done throughstandard MIL 1553 links.

    Two different types of computers are used to control the ailerons,rudder, elevators, THS and spoilers.- Three PRIMs- Three SECs.The module in charge of the backup system is also included in thecomputers group. It is called the BCM.All types of computer can control the A/C.Two FCDC applications do the data concentration integration.The FCDC applications are hosted into the CPIOMs and are used asinterface with the other systems (CDS, etc.).A BCM is part of the backup control system and is used in case oftotal electrical failure or in case of permanent or transient failure ofall the PRIMs and SECs.A full digital architecture (MIL 1553) does the communicationbetween the computers and the actuators to give protection to the A/Cagainst lightning indirect effects. This architecture also saves weightthrough the reduction of the number of wires that are installed fromthe computers to the actuators.

    MAINTENANCE COURSE - T1+T2 - RR Trent XWB 27 - Flights Controls

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  • PFCS - PFCS ARCHITECTURE

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  • PRIMARY FLIGHT CONTROL SYSTEM (PFCS) DESCRIPTION (2/3)PFCS (continued)

    FBW philosophyIn the Fly-by-wire (FBW) philosophy, each computer has acomputation part.The computation part receives the demand orders from the pilot inmanual mode or from the Automatic Flight System (AFS). It alsoreceives the A/C attitude and A/C response data from different units(ADIRUs, RGAUs, accelerometers).Based on the demand inputs and A/C attitude, the computers elaboratean A/C objective and calculate the surface deflection command orders.The surface deflection command orders are sent to the execution part,located in the actuator Flight Control Remote Modules (FCRMs) orelectronic modules. The actuators FCRM or electronic modules controltheir actuator to move the surface and receive feedback signals fromtheir related actuator.The FCRMs or electronic modules are installed on all the actuatorsfor digital communication between computers and actuators (digitaldata into analog and discrete signals). They also change and processthe analog signals from the actuator sensors into digital data to be sentto the computers.

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  • PFCS - FBW PHILOSOPHY

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  • PRIMARY FLIGHT CONTROL SYSTEM (PFCS) DESCRIPTION (2/3)PFCS (continued)

    PFCS actuationThe A/C uses different types of actuators:- Conventional servo-control actuators that use hydraulic power tomove the surfaces.- Electro-Hydrostatic Actuators (EHAs) that use electrical power tomove the surfaces.- Electrical Backup Hydraulic Actuators (EBHAs) that use hydraulicor electrical power to move the surfaces.The EHAs and EBHAs are used to delete one hydraulic circuit thusto decrease the A/C weight.Two electric motors are used to move the THS.Each actuator can be controlled by two different computers, PRIMxor SECx. When one PRIM is not available, the actuators associatedto it are controlled by the associated SEC, as a general rule forreconfiguration.

    MAINTENANCE COURSE - T1+T2 - RR Trent XWB 27 - Flights Controls

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  • PFCS - PFCS ACTUATION

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  • PRIMARY FLIGHT CONTROL SYSTEM (PFCS) DESCRIPTION (2/3)PFCS (continued)

    PFCS electrical backup systemThe electrical backup control system is active if there is a completeloss of electrical power or the P/BSW sets all the PRIMs and SECsto off. Its primary function is to control and stabilize the vertical andlateral axis of the A/C.The BCM is used as a Flight Control Computer (FCC) and has itsown power source, the Backup Power Supply (BPS). The BPS unitis an electric generator that changes yellow hydraulic power intoelectrical power.When the BCM operates, it controls only with the servo-